JP3464820B2 - Dielectric laminated resonator and dielectric filter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in a dielectric laminated resonator and a dielectric filter which are mainly used in high frequency radio equipment such as mobile phones. The dielectric multilayer resonator shown here may be used alone as a resonant element for high-frequency oscillation circuits, etc., or may be used as a bandpass filter or band elimination filter by combining multiple dielectric multilayer resonators. It is used for constructing a dielectric filter.

[0002]

2. Description of the Related Art In recent years, with the development of mobile communication, there is a strong demand for a small mobile phone which is convenient to carry. For miniaturization of high-frequency wireless devices such as mobile phones, miniaturization of components used is an important issue. In particular, the dielectric filter, which is widely used as a high frequency filter, is one of the large volume parts among the high frequency parts used in the radio circuit of a mobile phone, and therefore, miniaturization is strongly required.

A dielectric filter is constructed by connecting a plurality of dielectric resonators in cascade via coupling elements. Conventionally, a dielectric coaxial resonator in which electrodes are formed on the surface of a coaxial ceramic element has been used as a dielectric resonator, and a conventional dielectric filter is composed of a dielectric coaxial resonator. However, in the production of a dielectric coaxial resonator, there is a limit to the fine processing of ceramics, and it is difficult to reduce the thickness. Therefore, it was considered to use a dielectric laminated resonator composed of a flat stripline resonator.

An example of the above-mentioned conventional dielectric laminated resonator will be described below with reference to the drawings. Figure 15
(A) is an exploded perspective view of a conventional dielectric laminated resonator. Further, FIG. 7B is a line X in FIG.
It is a sectional view of a plane including -X '.

In FIG. 15, the first dielectric sheet 35 is used.
Form the stripline 36 on top of the stripline 3
The shield electrodes 7 are provided on the upper and lower sides of the dielectric sheets 35 and 37 laminated on the upper and lower sides of the electrode 6, respectively. A tip short-circuited strip line resonator is formed by grounding one end of the strip line 36 via the ground electrode 9. At a frequency at which the length of the strip line becomes a quarter wavelength, the impedance at the open end becomes infinite and the parallel resonance occurs. A dielectric laminated resonator having such a structure is disclosed in, for example, Japanese Patent Laid-Open No. 2-29.
0303 in FIG. 1 and the like.

On the other hand, FIG. 16 is an exploded perspective view of an antenna duplexer composed of a conventional dielectric filter. The antenna duplexer has a transmission filter and a reception filter.
A conventional dielectric filter will be described below with reference to the antenna duplexer shown in FIG. In FIG. 16, 701
To 706 are dielectric coaxial resonators, 707 is a coupled substrate, 7
08 is a metal case, 709 is a metal cover, 710 to 712 are series capacitors, 713 and 714 are inductors, 715 to 718 are coupling capacitors, 721 to 7
26 is a connection pin, 731 is a transmission terminal, 732 is an antenna terminal, 733 is a reception terminal, and 741 to 747 are electrode patterns formed on the combined substrate 707.

Dielectric coaxial resonators 701, 702, 703
The series capacitors 710, 711, 712 and the inductors 713, 714 form a transmission band elimination filter. In addition, the dielectric coaxial resonators 704 and 70
5, 706 and coupling capacitors 715, 716, 71
Reference numerals 7 and 718 form a reception bandpass filter.

One end of the transmission filter is connected to a transmission terminal electrically connected to the transmitter, the other end of the transmission filter is connected to one end of the reception filter and an antenna terminal electrically connected to the antenna. Connected. The other end of the reception filter is connected to a reception terminal electrically connected to the receiver. An antenna duplexer composed of a conventional dielectric filter having such a structure is disclosed in, for example, the literature (T. Nishikaw).
a, "RF Front End Circuit Components Miniaturized
Using Dielectric Resonators For CellularPortable
Telephones ", IEICE Transactions, vol.E74, No.6, p
p.1556-1562, June 1991). 4, etc.

[0009]

However, although the resonator can be made thinner in the above-mentioned structure, the resonator length is the same as the conventional one. Rather, the dielectric ceramic material that can be laminated is limited, and only the dielectric material having a low dielectric constant can be used, so that the length of the resonator is longer than in the past. In other words, in order to shorten the total length of the resonator, the resonance frequency depends on the propagation wavelength on the strip line, so the relative dielectric constant of the dielectric must be increased.However, dielectric materials with a large relative dielectric constant are generally used. In addition, since the firing temperature is high and the electrode (hereinafter referred to as the inner electrode) disposed in the dielectric material cannot be fired integrally, there is a problem that there is a limit to miniaturization. Further, a dielectric material having a large relative permittivity generally has a large dielectric loss tangent, which lowers the no-load Q of the dielectric laminated resonator, and also has poor temperature characteristics with respect to frequency. It had the problem of causing it.

Therefore, conventionally, in the above publication, strip lines are formed on two laminated dielectric sheets,
We proposed that these strip lines are connected and formed into two folded shapes.
Although it is possible to reduce the physical length of the resonator by folding back, it is difficult to further reduce the length.

Further, in the dielectric filter having the above-mentioned structure, since a large number of electronic parts such as capacitors and inductors or mechanical parts such as connection pins are used, there is a problem that miniaturization is difficult. There is a problem that it is difficult to reduce the manufacturing cost.

The present invention has been made in view of the above problems, and an object thereof is to shorten the length of the resonator more than the amount by which the strip line is folded while maintaining the performance of the resonator well. A small-sized and low-cost dielectric laminated resonator and a dielectric filter are provided.

[0013]

In order to solve the above problems, the present invention adopts a structure in which the strip line is formed in two bent shapes and the resonance frequency can be lowered, thereby making the strip line line. The length is further shortened, and the length of the resonator is effectively shortened.

That is, in the dielectric laminated resonator according to the first aspect of the present invention, the first dielectric sheet and the second dielectric sheet, and the first dielectric sheet formed on the upper surface of the first dielectric sheet. A strip line; and a second strip line formed on the upper surface of the second dielectric sheet.
Said second dielectric sheet is laminated on said dielectric sheet, and only said second dielectric sheet exists between said first strip line and said second strip line, The laminated body in which the first dielectric sheet and the second dielectric sheet are laminated is further laminated with the uppermost and lowermost dielectric sheets arranged above and below the lowermost dielectric sheet. A first shield electrode provided on the lower surface, a second shield electrode provided on the upper surface of the uppermost dielectric sheet, one end of the first strip line and one end of the second strip line And a ground electrode that grounds the other end of the first strip line, the other end of the second strip line is open, and the first shield electrode and the first strip The separation t1 from the track is Have a configuration that is set to a different spacing is spaced from the first strip line and the second strip line t2, and a second strip line and spaced apart from t3 between the second shield electrode.

Furthermore, in the dielectric laminated resonator of the invention of claim 2, wherein, in addition to the configuration of the invention of claim 1, sandwiched between the first dielectric sheet and second dielectric sheet A third dielectric sheet, a capacitive electrode is formed on the upper surface of the third dielectric sheet, and the capacitive electrode is grounded, and the third dielectric sheet is sandwiched. In the body, the length of the second strip line is set short so as not to cover the vicinity of the other end on the ground side of the first strip line, and the capacitance electrode is on the ground side of the first strip line. It is arranged so as not to cover the vicinity of the other end.

[0016] In addition, claim 3 in the dielectric laminated resonator of the mounting of the invention, claim 3 second and third respective dielectric sheets and second stripline in the invention described and the capacitor electrode of the first A plurality of strip lines are provided above the strip line.

Further, in the dielectric laminated resonator of the invention of claim 4, wherein the claim 4 in addition to the configuration of the invention described, the dielectric downward even in the second and third of the first stripline A plurality of sheets, second strip lines, and capacitive electrodes are provided.

Further, in the invention according to claim 5, the above-mentioned claim
The dielectric laminated resonator according to any one of claims 1 to 4, wherein:
Distance t1 between the shield electrode of the first strip line and the first strip line,
Separation between the first strip line and the second strip line
t2, between the second strip line and the second shield electrode
The separation t3 is specified and set to the relationship of t1>t2> t3.
It is a composition.

In the invention according to claim 6, the first invitation is provided.
Electrical sheet, second dielectric sheet and third dielectric sheet
And a first dielectric layer formed on the upper surface of the first dielectric sheet.
On the top of the strip line and the second dielectric sheet
The formed second strip line and the third dielectric
With a third stripline formed on the top surface of the sheet
And the first, second and third dielectric sheets are
The first dielectric sheet is the second dielectric sheet and the third dielectric sheet is the third dielectric sheet.
Stacked in a state of being sandwiched from above and below with the electric sheet,
Lamination in which the first, second and third dielectric sheets are laminated
The body is the uppermost dielectric sheet placed above it.
And is provided on the lower surface of the third dielectric sheet.
Of the first shield electrode and the uppermost dielectric sheet
The second shield electrode provided on the upper surface and the first shield electrode
One end of the trip line and one end of the second strip line
To connect one end of the third strip line with
A ground for grounding the pole and the other end of the first strip line
An electrode and other than the second and third strip lines
The end is open and the first shield electrode and the first stripe are
The separation t1 from the top line is the same as the first strip line and the second strip line.
Distance t2 from the strip line and the second strip
Separation different from the separation t3 between the line and the second shield electrode
The second shield electrode and the first strip.
The distance t4 between the first strip line and the third strip line is
Separation t5 from the strip line and the third strip line
To a distance different from the distance t6 between the path and the first shield electrode.
Is set, and further, the first, second and third dielectric sheaths are set.
And a laminated body in which the uppermost dielectric sheet is laminated
In the first, second and third strip lines
And on both sides of the first and second shield electrodes in the width direction.
Side shield electrodes are used as outer electrodes on the entire surface of both sides.
This basic structure
To each of the separations t1, t2, t3, and
The separations t4, t5, t6 are t1>t2> t3, and t4.
In this configuration, the relationship of>t5> t6 is set.

In addition, in the invention described in claims 7 and 8 , the dielectric laminated resonator according to any one of claims 1 to 4 is provided .
The distance t1 between the first shield electrode and the first strip line, the distance t2 between the first strip line and the second strip line, and the distance t2 between the second strip line and the second shield electrode. Separation t3, separation t4 between second shield electrode and first strip line, separation t5 between first strip line and third strip line, separation between third strip line and first shield electrode identify the t6
, T1>t3> t2, or t1 = t2 + t3, t4 =
In this configuration, the relationship of t5 + t6 is set.

In addition, in the invention of claims 9 to 14 , the length L of the second strip line and the third strip line is specified, and the length of the first strip line is L1.
As 0.2L1 ≤ L ≤ 0.65L1, 0.2L
1 ≤ L ≤ 0.5L1, or 0.2L1 ≤ L ≤ 0.3
The configuration is set to 5L1.

In the inventions of claims 15 and 16 , the basic structure of the dielectric laminated resonator according to any one of claims 1 to 4 and the dielectric laminated resonator according to claim 6 is provided.
Limiting the first strip line in formation, one end side of the connection electrode is connected to the first strip line is formed in a wide wide part of the line width, which is grounded in the first strip line other The end side is formed in a narrow detail of the line width, and the line width from the middle of the first strip line to the grounded other end side is set to be narrow.

Further, in the invention described in claim 17 , the dielectric laminated resonators according to claims 1 to 4 are limited,
These dielectric laminated resonators are further laminated with two dielectric sheets arranged above and below, and each shield electrode is formed as an inner electrode sandwiched between two dielectric sheets. There is.

In addition, in the eighteenth aspect of the present invention, each shield electrode in the dielectric laminated resonators of the first to fourth aspects is formed as an outer electrode located on the surface of the dielectric laminated resonator. The configuration is

According to a nineteenth aspect of the present invention, the dielectric laminated resonator according to the first to fourth aspects further includes one or a plurality of coupling electrodes coupled to an external circuit. A capacitor is constituted by the coupling electrode and the second strip line.

Furthermore, in the inventions of claims 20 and 21 , the coupling electrode of the invention of claim 19 is limited, and the coupling electrode is an outer electrode located on the surface of the dielectric laminated resonator. It is configured to be formed or formed as an inner electrode arranged between two dielectric sheets.

In addition, in the invention described in claim 22 , in the dielectric laminated resonator of the invention described in claim 19, the terminal electrodes are provided in the same number as the number of coupling electrodes and connected to the corresponding coupling electrodes. And the terminal electrode is formed as an outer electrode located on the surface of the dielectric laminated resonator.

Further, in the invention of claim 23 , the coupling electrode in the dielectric laminated resonator of the invention of claim 19 is formed on the surface of the dielectric sheet on which the shield electrode is formed. .

Further, in the invention described in claim 24 , in the dielectric laminated resonator according to any one of claims 1 to 4 , further comprising side shield electrodes provided on both side surfaces of each dielectric sheet. The side shield electrode is formed as an outer electrode located on the surface of the dielectric multilayer resonator, and the first shield electrode and the second shield electrode are connected to each other through the side shield electrode. There is.

In addition, according to the invention of claim 25 , in the dielectric laminated resonator according to any one of claims 1 to 4 ,
Limiting each strip line and connection electrode, each strip line extends from the end of each dielectric sheet provided with them, the connection electrode is provided on the side surface of the end of each dielectric sheet, The length of the second strip line is set to be shorter than that of the first strip line.

Further, in the invention described in claims 26 and 27 , the dielectric laminated resonator according to any one of claims 1 to 4 and the dielectric laminated resonator according to claim 6 are provided.
In this structure , the connection electrodes of each strip line are limited to other structures, and the connection electrodes are through-hole electrodes formed on the dielectric sheet, and both ends of the first, second, and third strip lines are connected. end of the side connected by the through-hole electrodes of the parts are first positioned inside the second and end portions of the third dielectric sheet, said first, second and third
The second side shield electrode is arranged at the end of the dielectric sheet, and the ground electrode is arranged at the other ends of the first, second, and third dielectric sheets.

Further, in the invention described in claims 28 and 29 , the dielectric laminated resonator according to any one of claims 1 to 4 and the base of the dielectric laminated resonator according to claim 6 are provided.
With this configuration limited, a wide electrode region wider than the line width of the first strip line is formed at the ground side end of the first strip line, and the first strip line defines the electrode region. It is configured to be connected to the ground electrode via.

In addition, in the dielectric filter according to the invention of claims 30 and 32 , a plurality of dielectric laminated resonators according to claim 19 are cascade-connected, or the dielectric laminated resonance according to claim 22. A plurality of vessels are connected in cascade.

Further, the dielectric film according to the invention of claim 31 is
In the dielectric multilayer resonator according to claim 6,
In addition to the basic configuration, one or more connected to an external circuit
It has several coupling electrodes and the coupling electrodes and the second strip are
A dielectric multilayer structure in which capacitors are composed of
A plurality of shakers are connected in cascade.

In addition, the dielectric film of the invention according to claim 33 is provided.
In the filter, the dielectric fill of the invention according to claim 31
Of multiple dielectric multilayer resonators connected in cascade with limited data
Are provided as many as the number of coupling electrodes, respectively, and the corresponding coupling
A terminal electrode connected to the electrode, the terminal electrode
Formed as an outer electrode located on the surface of the laminated body resonator
It has a configuration.

Further, in the invention of claim 34 , the dielectric filters of the inventions of claims 30 to 33 are limited, and a plurality of dielectric laminated resonators are respectively connected in series via an inductance. It is configured to be.

Further, in the invention described in Item 35 , the basic structure of the dielectric laminated resonator described in Item 6 is limited, and the connection electrode is used as a connection terminal to an external circuit. .

In addition, in the invention described in Item 36 , the basic structure of the dielectric laminated resonator described in Item 6 is limited, and further, it has two coupling electrodes to be coupled with an external circuit. Thus, a capacitor is configured by the coupling electrode and the second strip line .

[0039]

[Action] With the above arrangement, according to claim 1 in the dielectric laminated resonator of the invention described, separation t1 between the first shield electrode and the first strip line, the first strip line and the second
Distance t2 from the strip line and distance t3 between the second strip line and the second shield electrode, specifically, a relationship of t1>t2> t3, t1> t3.
> T2 or t1 = t2 + t3, the characteristic impedances of the second strip line and the third strip line are lower than the characteristic impedance of the first strip line, and therefore, The resonator composed of the strip line has an SIR structure in which the impedance changes stepwise on the way,
The resonance frequency is lowered, as a result, shorter than the physical length of the minutes of the resonator connecting each strip line to the folded shape, cut with shortening the length of the resonator.

Further, according to claim 2, in the dielectric laminated resonator of the invention of claim 3 and claim 4, wherein, by the addition of the capacitor electrodes, the capacitor resonance constituted by this capacitor electrode and the first strip line Since the capacitance component of the resonator is increased by being connected in parallel to the resonator, the resonance frequency becomes lower, and the length of the resonator becomes shorter. Moreover, since the dielectric material having a small relative permittivity can be used because the resonance frequency becomes low, it is possible to realize a dielectric laminated resonator having a high unloaded Q value and good temperature characteristics. In addition, the distance between the other end of the first strip line on the ground side and the second shield electrode can be set long. As a result, the characteristic impedance of the portion of the first strip line that faces the capacitance electrode can be made lower than the characteristic impedance of the other end on the ground side. Therefore, the resonator configured using the first strip line is The impedance becomes a stepwise change in the SIR structure, and the resonance frequency becomes even lower.

[0041] Particularly, in the invention of claim 5 and claim 6, wherein, the spacing t3 between the second strip line and the second shield electrode is small, between the second strip line and the second shield electrode Since the capacity formed in
Since the resonance frequency becomes low and the length of the connection electrode becomes long, the no-load Q value of the resonator deteriorates due to resistance loss and radiation loss of the high frequency current generated at the connection electrode . Therefore, although the performance of the resonator is slightly deteriorated, the resonator length can be further shortened.

Further, in the invention according to claim 7 , the separation t2 between the first strip line and the second strip line,
Separation t between the second strip line and the second shield electrode
Since the relationship with 3 is reversed, the effect of shortening the resonator length is slightly reduced, but a resonator with a high unloaded Q value and very good performance can be realized.

[0043] Further, in the invention according to claim 8, in order to reduce the loss of the resonator, to take particular increase the distance between the first strip line and the shield electrode in the grounding end side of the first strip line Desirably, since the minimum value of the distance between the first strip line and each shield electrode can be maximized on the grounded end side of the first strip line 2, the dielectric laminated layer having good performance while shortening the resonator length. It becomes possible to realize a resonator.

In addition, according to the inventions of claims 9 to 14 , it is possible to effectively shorten the length of the resonator and increase the no-load Q value to obtain good characteristics.

According to the fifteenth and sixteenth aspects of the invention, since the line width of the width detail formed on the grounded side of the first strip line is narrower than the wide portion formed on the connection electrode side, It is possible to increase the characteristic impedance of the narrow portion of the line width where the line width is narrow, thereby increasing the impedance step ratio, and thus further reducing the microstrip line length.

Further, in the invention of claim 17 , since the shield electrode is formed by the inner electrode and the silver paste for the inner electrode having a small glass frit can be used as the electrode paste, the conductor loss of the resonator is reduced. Can be reduced and the no-load Q value can be improved.

In addition, according to the eighteenth and twentieth aspects of the invention, since the shield electrode and the coupling electrode are formed of the outer electrodes, the shielding property is excellent.

According to the nineteenth aspect of the invention, since the capacitor is formed by the coupling electrode coupled to the external circuit and the second strip line, the capacitor is connected in series to the parallel resonator. Thus, the resonator having the two resonance characteristics of the series resonance and the parallel resonance as viewed from the coupling electrode is realized with a simple configuration.

Further, in the invention of claim 21 , since the coupling electrode is the inner electrode, the coupling electrode can be formed by the same printing process as the strip line formation, and the coupling electrode can be manufactured with high precision. , The variation in characteristics is reduced.

In addition, according to the twenty-second aspect of the present invention, since the terminal electrode is formed of the outer electrode, the size of the terminal electrode is independent of the capacitance value of the capacitor formed by the coupling electrode and the second strip line. It is possible to provide a resonator whose shape can be determined and which is easy to handle without the possibility of characteristic changes due to changes in the shape of the terminal electrode.

According to the twenty- third aspect of the invention, since the coupling electrode is formed on the same surface as the dielectric sheet on which the shield electrode is formed, the resonator can be downsized.

Further, in the twenty-fourth aspect of the present invention, since the open end of the upper shield electrode is forcibly made equal to the ground potential via the side shield electrode, the shield electrode may resonate unnecessarily near the resonance frequency. In addition to being prevented, the resonator is shielded to prevent electromagnetic interference with an external circuit.

In addition, in the twenty-fifth aspect of the invention, since the strip line extends from the end of the dielectric sheet, there is no waste in utilizing the end of the dielectric sheet, and the length of the resonator can be shortened.

According to the twenty-sixth and twenty- seventh aspects of the invention, the resonator is also covered by the second side shield electrode, so that almost perfect shielding property is realized.

Further, in the inventions of claims 28 and 29 , since the first strip line is connected to the ground electrode or the side shield electrode via the electrode region and grounded, the first strip line is grounded. Can be ensured by removing unnecessary inductance and resistance components.
Therefore, variations in the resonance frequency of the resonator can be eliminated and the unloaded Q value can be improved.

In addition, in the dielectric filter according to the invention of claims 30 to 33 , since a plurality of dielectric laminated resonators including a coupling capacitor are cascade-connected, a coupling capacitor or the like is used. The dielectric filter can be easily configured without any of the above, the number of parts can be reduced, the manufacturing process can be simplified, and the manufacturing cost can be reduced and the dielectric filter can be downsized.

Further, in the dielectric filter according to the thirty-fourth aspect of the present invention, since the plurality of dielectric laminated resonators are connected in cascade via the respective inductors, the amount of attenuation for harmonic signal components and the like becomes large.

Furthermore, in the dielectric laminated resonator according to the thirty-fifth aspect of the present invention, the connection electrode for connecting one ends of the first, second and third strip lines is also used as a connection terminal for an external circuit. Therefore, another terminal electrode for connecting to an external circuit is shared by the connection electrodes.

In addition, in the dielectric laminated resonator according to the thirty- sixth aspect of the present invention, two capacitors are formed by the two coupling electrodes and the second strip line which are coupled to an external circuit. bandpass filter easily one stage with a simple structure can be constructed.

[0060]

As described above, according to the dielectric laminated resonator of the invention described in claim 1 , the characteristic impedances of the second strip line and the third strip line are
Since the characteristic impedance of the strip line is lower than the characteristic impedance of the strip line and the characteristic impedance is changed to a step shape in the middle, the resonance frequency becomes low, and more than each strip line is connected in a folded shape. This has the effect of reducing the length of the resonator .

Further, according to the dielectric laminated resonator of the present invention as defined in claims 2, 3 and 4, a capacitor connected in parallel with the resonator is formed by adding a capacitive electrode, Since the configuration is such that the capacitance component of the resonator is increased, the resonance frequency is further lowered, and the effect that the length of the resonator is further shortened is achieved.
A dielectric material having a small relative dielectric constant can be used, and a dielectric laminated resonator having a high unloaded Q value and good temperature characteristics can be realized. Moreover, since the SIR structure in which the impedance changes stepwise in the middle of the line, the resonance frequency can be further lowered.

In particular, according to the inventions of claims 5 and 6 , the resonator performance is slightly deteriorated, but the resonator length can be further shortened.

According to the invention described in claim 7 , although the effect of shortening the resonator length is slightly reduced, a resonator having a high unloaded Q value and excellent performance can be realized.

Further, according to the invention described in claim 8 , it is possible to realize a dielectric laminated resonator having good performance while shortening the resonator length.

In addition, according to the inventions of claims 9 to 14 , the length of the resonator is effectively shortened and the unloaded Q is reduced.
The value can be increased to obtain good characteristics.

According to the fifteenth and sixteenth aspects of the present invention, the characteristic impedance of this portion is increased by the width detail formed on the grounded side of the first strip line, and the impedance step ratio is increased. Since the length is increased, the strip line length can be further shortened.

Further, according to the seventeenth aspect of the present invention, since the shield electrode is formed by the inner electrode and the silver paste for the inner electrode having less glass frit can be used as the electrode paste, the conductor loss of the resonator is reduced. As a result, the unloaded Q value can be improved.

In addition, according to the eighteenth and twentieth aspects of the invention, since the shield electrode and the coupling electrode are formed of the outer electrodes, the shielding property is excellent.

According to the nineteenth aspect of the invention, since the capacitor is formed by the coupling electrode and the second strip line, the characteristic seen from the coupling electrode has two resonances, that is, series resonance and parallel resonance. The resonator can be realized with a simple structure.

Furthermore, according to the twenty- first aspect of the present invention, since the coupling electrode is the inner electrode, the coupling electrode can be manufactured with high accuracy, and variations in characteristics are reduced.

In addition, according to the invention of claim 22 ,
Since the size and shape of the terminal electrode can be determined irrespective of the capacitance value of the capacitor formed by the coupling electrode and the second strip line, it is easy to handle without changing the characteristics of the terminal electrode. A resonator can be provided.

According to the twenty- third aspect of the invention, since the coupling electrode is formed on the same surface as the dielectric sheet on which the shield electrode is formed, the resonator can be downsized.

Further, according to the twenty-fourth aspect of the present invention, since the open end of the upper shield electrode is forcibly made equal to the ground potential by the side shield electrode, the shield electrode resonates unnecessarily near the resonance frequency. Can be prevented,
The resonator can be shielded well in one phase, and electromagnetic interference with an external circuit can be effectively prevented.

In addition, according to the invention of claim 25 ,
Since the strip line extends from the end of the dielectric sheet,
There is no waste in utilizing the end portion of the dielectric sheet, and the length of the resonator can be shortened.

According to the twenty-sixth and twenty- seventh aspects of the invention, since the resonator is also covered with the second side shield electrode, it is possible to realize almost perfect shielding.

Further, according to the inventions of claims 28 and 29 , since the electrode region having a width wider than the line width is provided at the end of the first strip line, it is unnecessary to ground the first strip line. It is possible to surely remove the inductance component and the resistance component, and it is possible to improve the no-load Q value by eliminating the variation in the resonance frequency of the resonator.

In addition, according to the dielectric filter of the invention of claims 30 to 33, since a plurality of dielectric laminated resonators including a coupling capacitor are cascade-connected,
It is possible to reduce the number of parts and simplify the manufacturing process, and it is possible to provide a miniaturized dielectric filter at a low manufacturing cost.

According to the dielectric filter of the thirty-fourth aspect of the present invention, since the plurality of dielectric laminated resonators are connected in series via the respective instances, it is possible to increase the attenuation amount with respect to the harmonic signal component and the like. .

Further, according to the dielectric laminated resonator of the invention as set forth in claim 35 , the connection electrode for connecting one ends of the first, second and third strip lines can be used as a connection terminal for an external circuit. Since it is used, another terminal electrode for connecting to an external circuit can be shared by the connection electrode.

In addition, according to the dielectric laminated resonator of the thirty- sixth aspect of the invention, two capacitors are formed by the two coupling electrodes coupled to the external circuit and the second strip line. A single-stage bandpass filter can be easily configured with a simple configuration .

[0081]

Embodiments of the dielectric laminated resonator and the dielectric filter of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1A is an exploded perspective view of a dielectric laminated resonator according to a first embodiment of the present invention. Further, FIG. 3B shows a sectional view of a plane including line XX ′ in FIG.

In FIG. 1, 1 is a first dielectric sheet,
3 is the second dielectric sheet, and 5 and 6 are the uppermost and lowermost dielectric sheets. These dielectric sheets include, for example, the literature (H. Kagata et al., "Low-fire Microwave D
ielectric Ceramics and Multilayer Devices with Si
lver Internal Electrode ", Ceramic Transactions, vo
l.32, The American Ceramic Society Inc., pp.81-90
), Bi-Ca- having a relative dielectric constant of 58,
A low temperature sintered dielectric ceramic obtained by converting an Nb-O based ceramic material into a green sheet is used.

The first dielectric sheet 1 is laminated on the dielectric sheet 6. A first strip line 2 is formed on the upper surface of the first dielectric sheet 1 from one end to the other by means such as thick film printing of a conductor such as silver paste or copper paste. A second dielectric sheet 1 is formed on the first dielectric sheet 1 on which the first stripline 2 is formed.
The dielectric sheets 3 are laminated. A second strip line 4 having a length shorter than that of the first strip line 2 from one end to the other end is provided on the second dielectric sheet 3 in the same manner as the first strip line 1. Is formed by.
Therefore, as can be seen from FIG. 1, only the second dielectric sheet 3 exists between the first strip line 2 and the second strip line 4. Second stripline 4
The dielectric sheet 5 is laminated on the second dielectric sheet 3 on which is formed. Each of the dielectric sheets 1, 3, 5,
6 is pressed, and these dielectric sheets and inner electrodes (that is, the first and second strip lines 2 and 4) are simultaneously fired.

The first shield electrode 7a is provided on the lower surface of the fired product, that is, the lowermost dielectric sheet 6, and the second shield electrode 7b is provided on the upper surface, that is, the uppermost dielectric sheet 5. Each is formed as an outer electrode (specifically, an electrode located on the surface of the dielectric laminated resonator).

Further, the above-mentioned baked product (ie, 4
Side shield electrodes 17 are formed as outer electrodes on both sides of the strip lines 2 and 4 in the width direction of the one dielectric sheet 1, 3, 5, 6).

Further, the first dielectric sheet 1 and the second dielectric sheet 1
In the laminated body in which the dielectric sheets 3 are laminated, a connection electrode 8 is formed as an outer electrode on one side surface of each strip line 2 and 4 in the line length direction, and one end of the first strip line 2 and the connection electrode 8 are formed. One end of the two strip lines 4 is connected via the connection electrode 8.

In addition, the four dielectric sheets 1, 3,
In the case where the strip lines 5 and 6 are laminated, a ground electrode 9 is formed as an outer electrode on the entire other side surface of the strip lines 2 and 4 in the line length direction.
The other end of is grounded through the ground electrode 9.

As each of the outer electrodes, a silver paste for thick film printing containing a glass frit or the like is used, which is applied on the surface and then baked. The connection electrode 8 is also used as a connection terminal with an external circuit.

In the dielectric laminated resonator configured as described above, one end of the first strip line 2 and one end of the second strip line 4 are connected to each other, so that the open end side of the line is folded back on the way. It operates as a 1/4 wavelength short-circuited stripline resonator. That is, since the folded strip type short-circuited strip line resonator is configured by connecting the second strip line 4 and the first strip line 2 in series, first, the physical length of the resonator is short. Become.

Further, since a capacitance is formed by sandwiching the thin dielectric sheet 5 between the second strip line 4 and the shield electrode 7, and the loading capacitance is inserted in parallel with the resonator, the resonance frequency becomes low. . Furthermore, the thickness of the dielectric sheet 5 laminated on the second dielectric sheet 3 is thin, and the distance between the shield electrode 7 of the dielectric sheet 5 and the second strip line 4 is short, while First stripline 2
Since the distance between the second strip line 4 and the shield electrode 7 of the other dielectric sheet 6 is long, the characteristic impedance of the second strip line 4 becomes lower than the characteristic impedance of the first strip line 2, and therefore the second strip line 4 The resonator composed of the first strip line 2 and the first strip line 2 has an SIR (Stepped
Impedance Resonator) structure, the resonance frequency is further lowered. (For the reduction of the resonance frequency by the SIR structure, see, for example, M. Sagawa at al, “A Design Method”.
of Bandpass Filters Using Dielectric -Filled Coax
ial Resonators "IEEE TRANSACTIONS ON MICROWAVE
THEORY AND TECHNIQUES, VOL.MTT-33 NO.2 See P152-157 etc. in February 1985).

As a result, in addition to the reduction of the physical length, the formation of the capacitance and the reduction of the resonance frequency due to the SIR structure can result in a very short physical length of the resonator. it can. For example, frequency 900MHz
In the above, the length of the quarter-wave resonator formed on the dielectric sheet having a relative dielectric constant of 58 is 10.9 mm, but in the dielectric laminated resonator of the present invention, the length of the resonator is It can be shortened to less than half that of 4.6 mm.

In addition, since the dielectric material having a small relative permittivity can be used because the resonance frequency becomes low, the dielectric material having a small dielectric loss tangent can be used without increasing the physical length of the resonator. Can be used, and the unloaded Q value of the resonator can be improved.

The thickness of the four dielectric sheets 1, 3, 5, and 6 is set as follows. That is, the total value of the thicknesses of the lowermost dielectric sheet 6 and the first dielectric sheet 1, that is, the distance between the first shield electrode 7a and the first strip line 2 is t1, and the second dielectric sheet is the second dielectric sheet. The thickness of the body sheet 3,
That is, the first strip line 2 and the second strip line 4
When the distance between and is t2 and the thickness of the uppermost dielectric sheet 5, that is, the distance between the second strip line 4 and the second shield electrode 7b is t3, first, when t1>t2> t3, Since the thickness t3 is small, the capacitance formed between the second strip line 4 and the second shield electrode 7b becomes large and the resonance frequency becomes low. Further, since the connection distance between the first strip line 2 and the second strip line 4 becomes long, the length of the connection electrode 8 becomes long accordingly, and the substantial strip line length becomes long. Also lowers the resonance frequency. However, the unloaded Q of the resonator due to the resistance loss and radiation loss of the high frequency current generated at the connection electrode 8.
The value deteriorates. Therefore, when t1>t2> t3, the resonator performance is slightly degraded, but the resonator length can be further shortened.

On the other hand, when the thickness of each dielectric sheet is set to t1>t3> t2, the above effect is reversed, and the effect of shortening the resonator length is slightly reduced, but the unloaded Q value is high. It has a feature that can realize a resonator with very good performance.

Therefore, in the present embodiment, the thickness of each dielectric sheet is set to the relationship of t1 = t2 + t3 to further improve the performance of the resonator.

That is, since the magnetic field energy component is large on the grounded end side of the first strip line 2, in order to reduce the loss of the resonator, especially on the grounded end side of the first strip line 2, the first strip line is formed. 2 and shield electrode 7
This is because it is desirable to increase the distance between a and 7b. Here, since the loss due to the shield electrodes 7a and 7b is mainly due to the shield electrode on the side closer to the first strip line 2, the distance between the upper and lower two shield electrodes 7a and 7b is now fixed. Considering the above, the first strip line 2 on the ground end side of the first strip line 2
And the condition that the minimum value of the distance between the shield electrodes 7a and 7b can be maximized is that the distance between the first strip line 2 and the two shield electrodes 7a and 7b is equal, that is, t1 = t2 + t3. Is. Therefore, with the above configuration, it is possible to realize a dielectric laminated resonator having a short resonator length and good performance. However, in the present invention, both the cases of t1>t2> t3 and t1>t3> t2 can be reduced as long as the resonance frequency can be lowered, and both cases are included. It should be noted that the first dielectric sheet 1 is provided without providing the lowermost dielectric sheet 6.
The first shield electrode 7a may be formed on the lower surface of the. In this case, the thickness of the first dielectric sheet 1 is t
Set to 1.

Furthermore, since the resonator can be completely shielded by the side surface shield electrode 17 formed on the side surface of the laminated body, electromagnetic interference between the dielectric laminated resonator and an external circuit and dielectric laminated resonance. It is possible to prevent the coupling between the resonators when the devices are arranged side by side. In addition, the side shield electrode 17 functions to forcibly make the open end of the upper shield electrode 7 equal to the ground potential by connecting the upper and lower shield electrodes 7 to each other, and the shield electrode 7 causes the strip line resonance. Prevent unnecessary resonance near the resonance frequency of the device. Therefore, the side surface shield electrodes 17 formed as the outer electrodes on both side surfaces of the laminate can realize a resonator having excellent shield characteristics and good resonance characteristics.

As described above, in the present embodiment, with the above-described structure, it is possible to realize a small-sized dielectric laminated resonator having good performance. (Second Embodiment) A dielectric laminated resonator according to a second embodiment of the present invention will be described below with reference to the drawings.

FIG. 2A shows an exploded perspective view of a dielectric laminated resonator according to the second embodiment of the present invention, and FIG. 2B shows a plane including line XX 'in FIG. 2A. FIG. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In FIGS. 2A and 2B, the structure of the dielectric laminated resonator is the same as that shown in the first embodiment except for the following two points. One of the differences is that in the first embodiment, the line width of the first strip line is the same from one end to the other end, but in this embodiment, the connection electrode 8 of the first strip line 2 is connected. The impedance of the first strip line 2 is changed stepwise from the middle, with one end side being a wide portion 2a having a wide line width and the other end side of the first strip line 2 being grounded being a width detail 2b having a narrow line width. This is the point where the SIR structure is set.

Another difference is that the shield electrodes 7a, 7b are formed as outer electrodes on the surface in the first embodiment, but in the present embodiment, the shield electrodes 7a, 7b are formed.
The point b is formed by inner electrodes sandwiched between the dielectric sheet 10 and the dielectric sheet 11 and the dielectric sheet 1 and the dielectric sheet 12, respectively. The side shield electrode 17 has a first
The outer electrodes are formed on both side surfaces of the laminate in the same manner as in the above embodiment.

It is known that the SIR type resonator can realize a resonator having a shorter stripline length by a larger impedance step ratio. In the structure of the present embodiment, since the line width 2b formed on the grounded side of the first strip line 2 is narrower than the wide portion 2a formed on the connection electrode 8 side, the line width is narrow. The characteristic impedance of the portion 2b can be increased, and therefore the impedance step ratio is increased.

When the shield electrode is formed of the inner electrodes sandwiched by the dielectric sheets, the silver paste for the inner electrodes having a small glass frit can be used as the electrode paste, so that the conductor loss of the resonator is reduced. Can be reduced.

As described above, according to this embodiment,
In addition to having the same effects and characteristics as those of the first embodiment, SI
Since the impedance step ratio of R can be further increased, the strip line length can be further shortened. Furthermore, the shield electrode 7 can be formed of an inner electrode, and a material having a small glass frit can be used as the material used for the shield electrode 7, and the unloaded Q value can be improved. (Third Embodiment) A dielectric laminated resonator according to a third embodiment of the present invention will be described below with reference to the drawings.

FIG. 3A is an exploded perspective view of the dielectric laminated resonator 220 according to the third embodiment of the present invention, and FIG. 3B includes the line XX 'in FIG. 3A. It is a sectional view of a plane. Further, FIG. 7C shows an equivalent circuit diagram of the dielectric laminated resonator 220 of this embodiment.

The structure of the dielectric laminated resonator 220 of this embodiment shown in FIGS. 3A and 3B is different from the structure shown in the first embodiment in that the second shield electrode 7b is used.
The second shield electrode 7 of the dielectric sheet 5 in which the
The coupling electrode 13 serves as an outer electrode on the same surface as the surface on which b is formed.
This is the point that a capacitor is formed between the coupling electrode 13 and the second strip line 4, which is individually formed, and this resonator couples the present resonator with an external circuit. The other structure is the same as that of the first embodiment.

The operation of the dielectric laminated resonator 220 configured as described above will be described below with reference to FIG. The tip short-circuited strip line resonator configured by connecting the first strip line 2 and the second strip line 4 can be regarded as forming the parallel resonator 14 in the vicinity of the resonance frequency.

The second strip line 4 and the coupling electrode 13 form a capacitor 15. The coupling electrode 13 functions as a terminal for connecting the dielectric laminated resonator to an external circuit. In this circuit, the capacitor is connected to the parallel resonant circuit in series, so
The electrical characteristics of this dielectric multilayer resonator viewed from the coupling electrode 13 have two resonances, that is, series resonance and parallel resonance. That is, the circuit has infinite impedance at the parallel resonance frequency and zero impedance at the series resonance frequency. Therefore, the dielectric laminated resonator of the present embodiment operates as a one-stage notch filter that attenuates the signal component of the series resonance frequency.

(Modification of Third Embodiment) FIG. 4A is an exploded perspective view of a dielectric laminated resonator according to a modification of the third embodiment of the present invention, and FIG. A sectional view of a plane including a line XX ′ in FIG.

This modification is different from the third embodiment in that one end of the first strip line 2 and one end of the second strip line 4 have a plurality of through-hole electrodes 62.
Through the through-hole electrode 62 of the laminated body.
The second side shield electrode 61 is formed on the side surface on the side.

In the dielectric laminated resonator configured as described above, one end of the first strip line 2 and one end of the second strip line 4 are connected via the plurality of through hole electrodes 62. , It is not necessary to extend the connection point side (the left end in the figure) of each strip line 2, 4 to the end of the dielectric sheet 1, 3, and as a result, the side surface of the laminated body on the connection point side (that is, The second side shield electrode 61 can be formed on the entire surface of the side surface on the side of the through-hole electrode 62.

Therefore, in this modification, in addition to having the same effects and characteristics as those of the third embodiment, the laminated body has the shield electrode 7, the side shield electrode 17, and the first shield electrode 17 except the portion of the coupling electrode 13. Since the second side shield electrode 61 and the ground electrode 9 cover the resonator, almost perfect shield performance can be realized, and a resonator that is not easily influenced by the outside can be easily configured with a simple structure.

(Other Modification of Third Embodiment) FIG. 5A shows an exploded perspective view of a dielectric laminated resonator 230 according to another modification of the third embodiment of the present invention. FIG. 6B is a sectional view of a plane including the line XX ′ in FIG.

This modification is characterized in that the coupling electrode 13 is formed as an inner electrode by further stacking another dielectric sheet 43 on the dielectric sheet 5. When the inner electrode is used as described above, the coupling electrode 13 can be formed by the same printing process as that of the strip line, so that the coupling electrode 13 can be manufactured with high accuracy and the variation in characteristics can be reduced.

Further, in order to connect the coupling electrode 13 to the outside, one terminal electrode 41 is formed on the upper surface of the dielectric sheet 43 by an outer electrode. The side electrode 42 connects the coupling electrode 13 and the terminal electrode 41. When the side electrode 42 is not provided, it may be connected by a through hole. The equivalent circuit of this modification is the same as that of FIG. The size and shape of the terminal electrode 41 are the same as those of the capacitor 1
Since it does not contribute to the capacitance value of No. 5, there is no fear that the shape of the terminal electrode 41 may be changed or the characteristics of the dielectric laminated resonator may change due to the mounting state of the dielectric laminated resonator on the circuit board. It's easy.

As described above, according to this embodiment and the modification of this embodiment, the second strip line 4 and the coupling electrode 1 are provided in addition to the same effects and characteristics as those of the first embodiment.
By forming the capacitor 15 between the resonator 3 and the capacitor 3, it is possible to easily form a resonator having a characteristic of two resonances, that is, series resonance and parallel resonance, as viewed from the coupling electrode 13 with a simple structure. (Fourth Embodiment) A dielectric filter according to a fourth embodiment of the present invention will be described below with reference to the drawings.

FIG. 6A shows an exploded perspective view of a dielectric filter according to a fourth embodiment of the present invention, which is constructed by using the dielectric laminated resonator 220 according to the third embodiment of the present invention. FIG. 2B shows an equivalent circuit diagram of the dielectric filter of this embodiment.

The connection pattern 22 is formed on the mounting substrate 221.
2, 223 and a ground pattern 227 are formed, and the connection pattern 222 has a first dielectric multilayer resonator 220.
The coupling electrode 13 of a is connected, and one end of the air-core coil 224 as an inductance and one end of the chip capacitor 225 are connected. In addition, the mounting board 221
The coupling electrode 13 of the second dielectric laminated resonator 220b is connected to the upper connection pattern 223, and the other end of the air core coil 224 and one end of the chip capacitor 226 are connected. Further, the ground pattern 227 on the mounting substrate 221 has the dielectric laminated resonators 220a and 220b.
Each of the ground electrodes 8, the shield electrodes 7a and 7b, or the side shield electrodes 17, or each of them is electrically connected to ground and the chip capacitors 225 and 22 are connected.
The other end of each of 6 is also grounded.

The operation of the dielectric filter configured as described above will be described below with reference to FIG.

The equivalent circuit of the dielectric laminated resonators 220a and 220b is shown in FIG. 3C, and operates as a resonator having two resonances of series resonance and parallel resonance. At the series resonance frequency, the impedance of the resonator becomes zero, so that those resonators connected in series via the air-core coil 224 constitute a band elimination filter. Chip capacitor 2 connected in parallel with the resonator
25 and 226 are air core coils 22 connected between the resonators.
4 together with 4 to form a low-pass filter to attenuate a harmonic signal component and the like.

The dielectric filter of this embodiment does not require a chip capacitor corresponding to the capacitor 15 normally required for a band elimination filter or a connection pin for connecting a resonator and a chip capacitor. Further, since the resonator can be completely shielded by the side surface shield electrode 17 formed on the side surface of the laminated body, even if the dielectric laminated resonators are arranged close to each other, unnecessary coupling between the resonators does not occur, Good filter characteristics can be obtained.

Therefore, in the dielectric filter of this embodiment, the band elimination filter can be easily constructed, and as a result, the manufacturing process can be simplified, the cost can be reduced, and the size of the dielectric filter can be reduced. Can be realized.

In the dielectric filter of this embodiment, a plurality of dielectric laminated resonators 220a ... Are connected in series via the air core coil (inductance) 224.
It is needless to say that the cascade connection may be made directly without the interposition of 24, and the types of the dielectric laminated resonators to be cascade-connected are the dielectric laminated resonators described above and the dielectric laminated resonators described later. Good. (Fifth Embodiment) Hereinafter, a dielectric laminated resonator according to a fifth embodiment of the present invention will be described with reference to the drawings.

FIG. 7A shows an exploded perspective view of a dielectric laminated resonator according to the fifth embodiment of the present invention, and FIG. 7B shows a plane including line XX 'in FIG. 7A. FIG. In the following description, the same parts as those in the first embodiment will be designated by the same reference numerals.

In FIGS. 7A and 7B, 1 is the first
Dielectric sheet, 3 is the second dielectric sheet, and 18 is the third
The dielectric sheets 5 and 5 are other dielectric sheets. For these dielectric sheets, the same low temperature sintered dielectric ceramic as that used in the first embodiment is used.

On the third dielectric sheet 18, a third strip line 16 is formed from one end to the other end by means such as thick film printing of a conductor such as silver paste or copper paste. The first dielectric sheet 1 is provided on the third dielectric sheet 18 on which the third strip line 16 is formed.
Are laminated, and the first strip line 2 is formed on the first dielectric sheet 1 from the one end to the other end by the same means as described above. The second dielectric sheet 3 is laminated on the first dielectric sheet 1 on which the first strip line 2 is formed. On the second dielectric sheet 3,
A second strip line 4 having the same shape as the third strip line 16 is formed from one end to the other end.

The line lengths of the third strip line 16 and the second strip line 4 are set shorter than the line length of the first strip line 2.

The dielectric sheet 5 is laminated on the second dielectric sheet 3. The dielectric sheets 1, 3,
5 and 18 are pressed in a laminated state, and the dielectric sheet and the inner electrode sandwiched between them are simultaneously fired. A shield electrode 7 is formed on each of the upper and lower surfaces of the fired laminate.
A and 7b are formed by outer electrodes. As can be seen from FIG. 7A, the second and third strip lines 4 and 16 have substantially their entire surfaces covered with the first and second shield electrodes 7.
It faces a and 7b.

Further, side shield electrodes 17 for preventing electromagnetic interference with an external circuit are formed as outer electrodes on the entire surfaces of both side surfaces of the laminated body. Therefore, as in the case of the fourth embodiment, the side shield electrodes 17 can completely shield both side surfaces of the resonator. Therefore, even if the dielectric laminated resonators are arranged close to each other, it is unnecessary between the resonators. It is possible to obtain good filter characteristics without any unnecessary coupling. Furthermore,
One end of the first strip line 2, one end of the second strip line 4, and one end of the third strip line 16 are connected via a connection electrode 8 formed of an outer electrode. First
The other end of the strip line 2 is grounded via a ground electrode 9 formed of an outer electrode. As the outer electrode, a silver paste for thick film printing containing glass frit or the like is used, which is formed by being applied on the surface and then baked. The connection electrode 8 is also used as a connection terminal with an external circuit.

The total value of the respective thicknesses of the third dielectric sheet 18 and the first dielectric sheet 1 (first shield electrode 7
a, the distance between the first strip line 2) t1, the thickness of the second dielectric sheet 3 (the distance between the first strip line 2 and the second strip line 4) t2, the uppermost dielectric sheet The thickness t5 (distance between the second strip line 4 and the second shield electrode 7b) t3 is t1 = t2 + t3. Further, the total value of the respective thicknesses of the uppermost dielectric sheet 5 and the second dielectric sheet 3 (distance between the second shield electrode 7b and the first strip line 2) t4 (= t2 + t
3), the thickness of the first dielectric sheet 1 (distance between the first strip line 2 and the third strip line 16) t5, the thickness of the third dielectric sheet 18 (third strip line 1
6 is the distance t6 between the first shield electrode 7a and
t4 = t5 + t6.

In the dielectric laminated resonator configured as described above, one end of the first strip line 2, one end of the second strip line 4, and one end of the third strip line 16 are connected to the connection electrode 8. And the open end side of the line is folded back in two directions and operates as a quarter-wavelength short-circuited strip line resonator. That is, the second
By connecting the strip line 4 and the third strip line 16 in series with the first strip line 2 in this way, a folded tip short-circuited strip line resonator is constructed. It gets shorter.

Further, in the present embodiment, the second and third strip lines 4 and 16 are connected in parallel with the resonator because substantially the entire surfaces thereof face the first and second shield electrodes 7a and 7b. The loading capacity is twice as large as that in the first embodiment (when only the second strip line 4 is formed and the third strip line 16 is not formed as in the present embodiment).
Further, since the second strip line 4 and the third strip line 16 are connected in parallel, the characteristic impedance on the open end side of the resonator line becomes lower than that of the first embodiment. Therefore, the length of the resonator can be further shortened as compared with the first embodiment.

The relationship between the line length of the first strip line 2 and the line length of the second strip line 4 is set as follows.

When the length of the second strip line 4 is long, the strip line folding effect is large and the resonance frequency is low, but the unloaded Q value is low and the characteristics are deteriorated. According to the experimental results, for example, in the dielectric laminated resonator having the structure of the fifth embodiment, the relative permittivity is 5
8 low-temperature sintered dielectric material, each dielectric sheet 1,
The widths of 3, 5, 18 are 2.7 mm, the line widths of the first and second strip lines 2 and 4 are 2 mm, and the dielectric sheet 3 between the first strip line 2 and the second strip line 4 is formed.
And the thickness of the dielectric sheet 5 between the second strip line 4 and the second shield electrode 7b are both 0.43.
mm, and the length L of the first strip line 2 is 5.5 mm, the length of the second strip line 4 is 0.35.
The resonance frequency was 1300 MHz and the unloaded Q value was 110 when xL, whereas the resonance frequency was 1 when the length of the second strip line 4 was 0.65 xL.
Although it was possible to reduce to 130 MHz, the no-load Q value deteriorated to 96.

As can be seen from the above experimental results, a practical dielectric filter resonator has an unloaded Q value of 9% or more.
Since the limit is up to about 6, it is not desirable to further increase the line length of the second strip line 4. Therefore, the line length of the second strip line 4 is preferably 0.65 × L or less. It is more preferably 0.5 × L or less, and 0.35 × L or less is preferable in order to obtain a resonator having better characteristics. On the other hand, conversely, if the line length of the second strip line is set to 0.2 × L or less, the effect of lowering the resonance frequency of the present invention becomes small, so the line length of the second strip line 4 is set to 0. 2 x L
It is desirable to set the above.

As described above, according to this embodiment,
In addition to having the same effects and characteristics as those of the first embodiment, the resonance frequency can be further lowered and the overall length of the resonator can be further shortened without deteriorating the unloaded Q value. (Sixth Embodiment) Hereinafter, a sixth embodiment of the present invention will be described with reference to the drawings.

This embodiment is basically the same as the structure of the first embodiment except that a capacitance electrode is added. In order to facilitate understanding, the structure of the dielectric laminated resonator including only the capacitive electrode will be described below.

FIG. 8A is an exploded perspective view of a dielectric laminated resonator provided with a capacitor electrode, and FIG. 8B is a sectional view of a plane including line XX 'in FIG. 8A. Shown in the figure (c)
Shows an equivalent circuit diagram of the present dielectric laminated resonator.

In FIGS. 8A and 8B, 1 is the first
2 is a second dielectric sheet, and 5 and 6 are uppermost and lowermost dielectric sheets. The same low temperature sintered dielectric ceramics used in the first embodiment are used for these dielectric sheets.

The first dielectric sheet 1 is laminated on the dielectric sheet 6. On the upper surface of the first dielectric sheet 1,
The strip line 2 is formed by means of thick film printing of a conductor such as silver paste or copper paste, and one end (the left end in FIG. 8a) of the strip line 2 is opened. A second dielectric sheet 3 is laminated on the first dielectric sheet 1 on which the strip line 2 is formed. A capacitive electrode 19 is formed on the upper surface of the second dielectric sheet 3 by the same means as described above so as to overlap with the open one end side of the strip line 2, and the capacitive electrode 19 of the strip line 2 is formed. It extends to almost the central position in the length direction. The dielectric sheet 5 is laminated on the second dielectric sheet 3.

All the dielectric sheets are pressed in a laminated state, and the respective dielectric sheets and the inner electrodes sandwiched between them are simultaneously fired. On each of the upper and lower surfaces of the fired laminated body, first and second shield electrodes 7a,
7b is formed by the outer electrode. Further, on both side surfaces in the width direction of the strip line 2 in the fired product (that is, a laminated body of four dielectric sheets 1, 3, 5, and 6),
The side shield electrode 17 as a ground electrode is formed by the outer electrode. Further, the ground electrode 9 is formed as an outer electrode over the entire surface on one side surface in the length direction of the strip line 2 in the fired product, while the other side surface in the length direction of the strip line 2 is formed on the other side surface. A connection terminal 45 for connecting to an external circuit is formed as an outer electrode.

Further, the capacitance electrode 19 is grounded through the side shield electrode 17, and one end (the right end in FIG. 8a) of the strip line 2 is grounded through the ground electrode 9. The other end (the left end in FIG. 8a) of the strip line 2 is open, and this other end is connected to the connection terminal 45. As each of the outer electrodes, a thick film printing silver paste containing glass frit or the like is used, which is formed by being applied on the surface and then baked.

The operation of the dielectric multi-layer resonator configured as described above will be described using the equivalent circuit shown in FIG. First, the tip short-circuited strip line resonator formed of the strip line 2 can be regarded as forming the parallel resonator 14 in the vicinity of the resonance frequency. By the strip line 2 and the capacitance electrode 19, the capacitor 2
0 is formed. In this structure, the capacitor 20 is connected in parallel as a loading capacitance to the resonator 14 equivalently constituted by the tip short-circuited strip line resonator. Therefore, by increasing the capacitance component of the resonator, the resonance frequency is lowered and the length of the resonator can be shortened.

On the open end side of the first strip line 2, the gap between the open end side portion and the capacitance electrode 19 is short, and the ground end side portion of the first strip line 2 and the second shield electrode 7b. The characteristic impedance of the portion of the first strip line 2 facing the capacitance electrode 19 is lower than the characteristic impedance on the ground end side because of the long distance from
Therefore, the resonator configured by using the first strip line 2 has the SIR structure in which the impedance changes stepwise in the middle of the line, and the resonance frequency is further lowered.

The above effects are combined, and as a result, the physical length of the resonator can be made extremely short.

Further, since the dielectric material having a small relative dielectric constant can be used because the resonance frequency becomes low, the dielectric material having a small dielectric loss tangent can be used without increasing the physical length of the resonator. Can be used, the unloaded Q of the resonator
It also has the effect of improving the value.

In addition, the capacitive electrode 19 is the strip line 2
Since it is formed so as to extend from the open end side to almost the central position in the length direction of the strip line and cover it, the capacitance component connected in parallel to the resonator becomes large, and the resonance frequency of the resonator becomes higher. It becomes lower, and the length of the resonator can be further shortened. Moreover, in the electromagnetic field distribution in the resonator, the electric field energy component is large at the open end side of the strip line, and the ground end side of the strip line has a large amount of magnetic field energy component. 2 of the total length
If it is larger than 1 / min, the effect of shortening the resonator length is small, but a high-frequency current induced by magnetic field energy flows through the capacitive electrode 19, so that resistance loss increases and the unloaded Q value of the resonator increases. Although there is a defect that causes deterioration, the present embodiment does not have such a defect. Further, the shortening of the resonator length by the SIR structure has the maximum effect when the characteristic impedance of the strip line 2 changes stepwise at the middle point in the length direction of the resonator. You can

Furthermore, since the side surface of the resonator can be completely shielded by the side surface shield electrode 17 formed on the side surface of the laminated body, electromagnetic interference between the dielectric laminated resonator and the external circuit and dielectric laminated body. It is possible to prevent coupling between the resonators when the resonators are closely arranged. In addition, the side shield electrode 17 acts to forcibly make the open end of the upper shield electrode 7 equal to the ground potential by connecting the upper and lower shield electrodes 7, 7 to each other, so that the shield electrode 7 is stripped. Prevents unnecessary resonance near the resonance frequency of the line resonator. Therefore, the side shield electrodes 17 as the outer electrodes formed on both side surfaces of the laminated body can realize a resonator having excellent shield characteristics and good resonance characteristics.

Further, the capacitance electrode 19 is the side shield electrode 1
By grounding via 7, it is possible to perform reliable grounding that is not easily affected by parasitic impedance, so that good resonance characteristics can be obtained.

Further, by adjusting the area of the capacitance electrode 19 and changing the value of the capacitor 20, it is possible to easily change and adjust the resonance frequency of the resonator while keeping the strip line 2 in the same shape. it can. Therefore, it also has the effect of facilitating the design of the resonator.

Therefore, with the resonator of this configuration, it is possible to realize a dielectric laminated resonator that is small in size, has good performance, and is easy to design.

Next, another structure of the dielectric laminated resonator having the capacitance electrode will be described with reference to the drawings.

FIG. 9A shows an exploded perspective view of another dielectric laminated resonator provided with a capacitive electrode, and FIG. 9B shows a cross section of a plane including line XX 'in FIG. 9A. The figure shows the equivalent circuit diagram of the dielectric laminated resonator of the present embodiment.

In FIGS. 9A and 9B, 1 is the first
Dielectric sheet, 3 is the second dielectric sheet, and 48 is the third
The dielectric sheets 5 and 5 are other dielectric sheets. For these dielectric sheets, the same low temperature sintered dielectric ceramic as that used in the first embodiment is used.

On the third dielectric sheet 48, the second capacitor electrode 22 is formed by means of thick film printing of a conductor such as silver paste or copper paste. The first dielectric sheet 1 is laminated on the third dielectric sheet 48 on which the second capacitance electrode 22 is formed.
The strip line 21 is formed on the upper surface of the dielectric sheet 1 by the same method as described above. The strip line 21 is
A wide portion 21 having a wide width at one end (the left end in FIG. 9a) side
It is formed in a and the other end side is formed in a narrow width detail 21b, and has a shape in which the line width from the middle of the strip line 21 is narrowed.

First with the strip line 21 formed
The second dielectric sheet 3 is laminated on the dielectric sheet 1, and the first capacitance electrode 19 is formed on the upper surface of the second dielectric sheet 3. Here, the first capacitance electrode 1
9 and the second capacitor electrode 22 are formed so as to overlap the open end of the strip line 21 in a state where the first to third dielectric sheets 1, 3 and 48 are laminated.

Second with the first capacitance electrode 19 formed
The other dielectric sheet 5 is laminated on the dielectric sheet 3. These four dielectric sheets 1, 3, 5,
48 is pressed in a laminated state, and in this state, each dielectric sheet and the inner electrode located between them are simultaneously fired.

The upper and lower surfaces of the fired product, that is, the third
The first shield electrode 7a and the second shield electrode 7b are formed as outer electrodes on the lower surface of the dielectric sheet 48 and the upper surface of the other dielectric sheet 5, respectively. Further, side shield electrodes 17 are formed as outer electrodes over the entire surfaces of both sides of the fired product in the short direction, and ground electrodes 9 are formed as outer electrodes on one side surface in the longitudinal direction.

The first capacitance electrode 19 and the second capacitance electrode 22 correspond to the side shield electrode 1 serving as a ground electrode.
The strip line 21 is grounded via the ground electrode 9 and the other end (the right end in FIG. 9a) is grounded via the ground electrode 9. At one end (left end in FIG. 9a) of the strip line 21, that is, on the side surface of the open end, a connection terminal 45 for connecting to an external circuit is provided by an outer electrode. As each of the outer electrodes, a thick film printing silver paste containing glass frit or the like is used, which is formed by being applied on the surface and then baked.

The operation of the dielectric laminated resonator configured as described above will be described using the equivalent circuit shown in FIG. 9C. The tip short-circuited strip line resonator constituted by the strip line 21 can be regarded as constituting the parallel resonator 14 in the vicinity of the resonance frequency. Also,
The strip line 21 and the capacitance electrode 19 form a capacitor 20, and the strip line 21 and the capacitance electrode 22 form a capacitor 23. Therefore, in this structure,
Equivalently, a capacitor 20 and a capacitor 2 are provided in parallel with the resonator 14 configured by the tip-short-circuit strip line resonator.
Since 3 and 3 are connected as a loading capacitance, the resonance frequency is lowered by the increase of the capacitance component of the resonator, and the length of the resonator can be shortened. Further, in this structure, the loading capacitance connected in parallel with the resonator is twice as large as that of the dielectric laminated resonator in which the capacitance electrode is formed. As a result, the resonance frequency of the resonator of this embodiment is lower than the resonance frequency of the dielectric laminated resonator in which the capacitance electrode is formed.

Further, the strip line 21 has a wide portion on the open one end side and a width detail on the grounded other end side, and the line width of the other end side grounded from the middle of the strip line 21. Because of the narrowed shape, the impedance step ratio of the SIR type resonator can be further increased. That is, since the characteristic impedance of the strip line 21 is larger at the ground end than at the open end, the line length of the strip line 21 can be further shortened.

Therefore, in the resonator of this structure, in addition to the effect similar to that of the dielectric laminated resonator in which the capacitance electrode is formed, the resonance frequency can be further lowered, and the total length of the resonator can be further improved. Can be shortened.

Next, a dielectric laminated resonator according to a sixth embodiment of the present invention will be described with reference to the drawings.

FIG. 10A is an exploded perspective view of a dielectric laminated resonator according to the sixth embodiment of the present invention, and FIG. 10B is the same.
Shows a sectional view of a plane including line XX ′ in FIG.

In FIGS. 10A and 10B, 1 is the first dielectric sheet, 3 is the second dielectric sheet, 18 is the third dielectric sheet, and 5 and 6 are the top and bottom layers. Is a dielectric sheet of. The same low temperature sintered dielectric ceramics used in the first embodiment are used for these dielectric sheets.

The first dielectric sheet 1 is laminated on the dielectric sheet 6. A first strip line 2 is formed on the upper surface of the first dielectric sheet 1 from one end to the other end by means of thick film printing of a conductor such as silver paste or copper paste. A second dielectric sheet 3 is laminated on the first dielectric sheet 1 on which the first strip line 2 is formed, and the second dielectric sheet 3 is formed.
The capacitive electrode 19 is formed on the upper surface of the same by the same means as described above.

A third dielectric sheet 18 is laminated on the second dielectric sheet 3 on which the capacitance electrode 19 is formed. On the upper surface of the third dielectric sheet 18, a second strip line 4 having a length shorter than that of the first strip line 2 is formed from one end to the other end. Here, since the second strip line 4 has a short length,
The upper part of the right end of the first strip line 2 in the figure (the end on the ground side connected to the ground electrode 9 described later) is not covered. Further, the capacitive electrode 19 is arranged such that the first strip line 2 and the second strip line 4 are arranged in the vertical direction in the state where the first to third dielectric sheets 1, 3 and 18 are laminated. It is formed so as to overlap. Further, as is clear from FIGS. 10A and 10B, the capacitance electrode 19 has a length set to be slightly shorter than that of the second strip line 4 and Similarly, it is arranged so as not to cover the vicinity of the ground side end of the first strip line 2.

The dielectric sheet 5 is laminated on the third dielectric sheet 18 on which the second strip line 4 is formed. The dielectric sheets are pressed in a laminated state, and in this state, the dielectric sheets and the inner electrodes sandwiched therebetween are simultaneously fired.

Upper and lower surfaces of the fired product, that is, the lower surface of the lowermost dielectric sheet 6 and the uppermost dielectric sheet 5.
A first shield electrode 7a and a second shield electrode 7b are formed as outer electrodes on the upper surface of each. Further, side shield electrodes 17 are formed as outer electrodes on the entire surfaces of both sides of the fired product in the short-side direction.
9 is grounded via the side shield electrode 17.

Further, as shown in FIG. 10B, a ground electrode 9 is formed by an outer electrode on one side surface in the longitudinal direction of the fired product, and one end of the first strip line 2 is connected via the ground electrode 9. Connected. Meanwhile, the first to third
On the other side surface in the longitudinal direction of the dielectric sheets 1, 3, 18 of
A connection electrode 8 is formed as an outer electrode, and the other end of the first strip line 2 and one end of the second strip line 4 are connected via the connection electrode 8. As each of the outer electrodes, a thick film printing silver paste containing glass frit or the like is used, which is formed by being applied on the surface and then baked. The connection electrode 8 is also used as a connection terminal with an external circuit.

The operation principle of the dielectric laminated resonator configured as described above is the same as that of the dielectric laminated resonator of FIG. 7 provided with the dielectric laminated resonator of the first embodiment and the capacitance electrode. It is explained by the combination. Therefore, in this embodiment, the resonance frequency can be further lowered by combining the effects of the first embodiment and the dielectric laminated resonator of FIG. 7, so that the length of the resonator can be further shortened. .

Since the capacitance electrode 19 is formed between the first strip line 2 and the second strip line 4, the loading capacitance is not limited to between the first strip line 2 and the capacitance electrode 19. Also, it is formed between the second strip line 4 and the capacitance electrode 19, so that the loading capacitance can be increased. Therefore, the resonance frequency can be further reduced.

As described above, according to this embodiment,
In addition to having the same effects and characteristics as the dielectric laminated resonator of FIG. 7 provided with the first embodiment and the capacitance electrode, the loading capacitance can be increased, so that the resonance frequency can be further lowered, and The total length can be further shortened. (Seventh Embodiment) Hereinafter, a dielectric laminated resonator according to a seventh embodiment of the present invention will be described with reference to the drawings.

FIG. 11 is an exploded perspective view of a dielectric laminated resonator according to the seventh embodiment of the present invention, and FIG. 12 is a sectional view of a plane including line XX 'in FIG.

The basic structure of the dielectric laminated resonator of this embodiment is a combination of the structures of the dielectric laminated resonators described so far. In FIG. 11, 1, 3, 5, 1
8, 23, 24, 25, 26, 27 and 28 are dielectric sheets. For these dielectric sheets, the same low temperature sintered dielectric ceramic as that used in the first embodiment is used.

A first strip line 29 is formed on the upper surface of the first dielectric sheet 1 so as to extend from one end to the other end. Second, fourth, sixth and eighth dielectric sheets 3, 2
The upper surfaces of 3, 25, and 27 have first, second, third, and
Fourth capacitance electrodes 19, 22, 30, 31 are formed.
Also, the third, fifth, seventh, and ninth dielectric sheets 18, 2
On the upper surface of each of the wires 4, 26, 28, a second wire having a length shorter than that of the first strip line 29 from one end to the other end,
Third, fourth and fifth strip lines 4, 32, 33, 3
4 are formed respectively.

At the other end (right end in FIG. 11) of the first strip line 29, an electrode region 44 having a line width equal to the width of the first dielectric sheet 1 is formed.

The respective dielectric sheets are the ninth dielectric sheet 28, the eighth dielectric sheet 27, the seventh dielectric sheet 26, the sixth dielectric sheet 25, the first dielectric sheet 1, The second dielectric sheet 3, the third dielectric sheet 18,
The fourth dielectric sheet 23, the fifth dielectric sheet 24, and the dielectric sheet 5 are stacked in this order. Here, the capacitance electrode 19
Is the first strip line 2 in the laminated state of the dielectric sheets.
9 and the second strip line 4 and the arrangement region overlap each other in the vertical direction, and the capacitance electrode 30 has the arrangement regions of the first strip line 29 and the fourth strip line 33 in the laminated state of the dielectric sheets. It is formed so as to overlap in the vertical direction. In addition, the capacitive electrode 22 is the second strip line 4
Also, the third strip line 32 and the arrangement region overlap each other in the vertical direction, and the capacitance electrode 31 is formed by the fourth strip line 3
The third and fifth strip lines 34 and the arrangement region are formed so as to overlap each other in the vertical direction.

The dielectric sheets are pressed in a laminated state, and in this state, the dielectric sheets and the inner electrodes are simultaneously fired.

First and second shield electrodes 7a and 7b are formed as outer electrodes on the upper and lower surfaces of the fired product, respectively. Side shield electrodes 17 are formed of outer electrodes on both side surfaces of the fired product in the short direction, and the capacitance electrodes 19, 22, 30, 31 are grounded via the side shield electrodes 17. The connection electrode 8 is formed of an outer electrode on one side surface in the longitudinal direction of the fired product,
One end of the first strip line 29 and one end of each of the second, third, fourth and fifth strip lines 4, 32, 33, 34 are connected via this connection electrode 8. A ground electrode 9 is formed as an outer electrode on the other side surface in the longitudinal direction of the fired product, and the electrode region 44 of the first strip line 29 is grounded via the ground electrode 9. As each of the outer electrodes, a thick film printing silver paste containing glass frit or the like is used, which is formed by being applied on the surface and then baked. The connection electrode 8 is also used as a connection terminal with an external circuit.

The operation principle of the dielectric laminated resonator having the above structure is basically the same as that of the dielectric laminated resonator of the sixth embodiment. In this embodiment, the structure of the sixth embodiment is repeatedly stacked in the vertical direction so that the effect is further enhanced.

Further, in this embodiment, a wide electrode region 44 wider than the line width of the first strip line 29 is provided on the ground end side of the first strip line 29, and the first strip line 29 is connected to this electrode. Since the first strip line 29 is grounded by being connected to the ground electrode 9 or the side shield electrode 17 through the region 44, the grounding of the first strip line 29 can be ensured by removing an unnecessary inductance component or resistance component. No load Q by eliminating the variation of the resonance frequency of the resonator
The value can be improved.

As described above, according to this embodiment, in addition to having the same effects and characteristics as the sixth embodiment, a large loading capacitance can be obtained, so that the length of the resonator can be further shortened. In addition, the grounded end of the strip line can be surely connected, and the variation of the resonance frequency of the resonator is small, and the dielectric laminated resonator having a high unloaded Q value can be realized. (Eighth Embodiment) A dielectric laminated resonator according to an eighth embodiment of the present invention will be described below with reference to the drawings.

FIG. 13A is an exploded perspective view of the dielectric laminated resonator 110 according to the eighth embodiment of the present invention, and FIG. 13B includes the line XX 'in FIG. 13A. A cross-sectional view of the surface is shown, and FIG. 1C shows the dielectric laminated resonator 1 of this embodiment.
10 shows an equivalent circuit diagram of 10.

In the structure of the dielectric laminated resonator 110 of this embodiment shown in FIGS. 13A and 13B, unlike the structure shown in the dielectric laminated resonator of the fifth embodiment (FIG. 7). The point is that the two coupling electrodes 13a and 13b are formed by outer electrodes on the surface, and these coupling electrodes and the second strip line 4 are formed.
The point is that a capacitance is formed between and, and this resonator couples the present resonator with an external circuit. Other than that, the structure is the same as that of the dielectric laminated resonator of the fifth embodiment.

The operation of the dielectric laminated resonator 110 configured as described above will be described below with reference to FIG. 13 (c). The tip short-circuited strip line resonator configured by connecting the first strip line 2, the second strip line 4 and the third strip line 16 constitutes the parallel resonator 14 in the vicinity of the resonance frequency. Can be regarded as

Further, the second strip line 4 and the coupling electrodes 13a and 13b respectively provide capacitors 15a and 15a.
15b is formed. The coupling electrodes 13a and 13b are
It functions as an input / output terminal for connecting this dielectric laminated resonator to an external circuit. This circuit has the characteristics of a one-stage bandpass filter using these capacitors as the input / output coupling capacitance of the parallel resonant circuit.

As described above, according to this embodiment,
In addition to having the same effects and characteristics as the dielectric laminated resonator of the fifth embodiment, the second strip line 4 and the coupling electrode 13 are provided.
Each capacitor 15 formed between a and 13b
With a and 15b, a one-stage bandpass filter can be easily configured with a simple structure. (Ninth Embodiment) A ninth embodiment of the present invention will be described below with reference to the drawings.

FIG. 14A is an exploded perspective view of a dielectric filter according to a ninth embodiment of the present invention, which is configured by connecting the dielectric laminated resonators 110 of the eighth embodiment in multiple stages.

Three connection patterns 112, 113, 114 and a ground pattern 115 are formed on the mounting substrate 111. The coupling electrode 13a of the first dielectric laminated resonator 110a is connected to the connection pattern 112. The connection pattern 113 includes the first dielectric multilayer resonator 1
10a of coupling electrode 13b and second dielectric laminated resonator 1
The coupling electrode 13b of 10b is connected. Further, the coupling electrode 13a of the second dielectric laminated resonator 110b is connected to the connection pattern 114. The ground pattern 115 includes
Any or all of the ground electrode 8, the shield electrode 7, and the side shield electrode 17 of each of the dielectric laminated resonators 110a and 110b are electrically connected.

The operation of the dielectric filter configured as described above will be described below with reference to the equivalent circuit diagram of FIG.

When the dielectric laminated resonators 110a and 110b are connected in cascade, the dielectric laminated resonators 110a and 110b are connected.
The capacitors 15b are connected in series and operate as inter-stage coupling capacitors. In addition, the dielectric laminated resonator 11
Each of the capacitors 15a of 0a and 110b operates as an input / output coupling capacitor. Therefore, a capacitive coupling type multi-stage filter is configured, and for example, a multi-stage bandpass filter having excellent selection characteristics such as Chebyshev characteristics can be configured.

Further, it is not necessary to provide a chip capacitor corresponding to the capacitors 15a and 15b normally required in the bandpass filter or a connection pin for connecting the resonator to the electrode pattern on the mounting board.

Further, since the side shield electrode 17 can completely shield the resonator, even if the dielectric laminated resonators are arranged close to each other, unnecessary coupling between the resonators does not occur and good filter characteristics are obtained. Obtainable.

As described above, according to this embodiment,
A multi-stage bandpass filter with excellent selection characteristics can be easily configured, and the chip capacitor and connection pins required for the bandpass filter are not required, so that the manufacturing process is simple and the cost can be reduced. It is possible to reduce the size of the dielectric filter.

In the above description of the embodiments, the single resonator in which one strip line resonator is formed on the dielectric sheet has been described. However, the present invention is not limited to this. Of course, the same can be applied to the case where two or more strip line resonators are formed above. In this case, the strip line resonators are electromagnetically coupled to each other, and the filter can be configured by itself. It goes without saying that the present invention is also very effective as a technique for shortening the length of each strip line resonator that constitutes such a filter. Therefore, the present invention naturally includes a dielectric multilayer filter having such a structure.

Further, in the above description, only the case where the dielectric laminated resonator of the present invention is applied to a dielectric filter has been described. However, for example, a voltage controlled oscillator (V
The dielectric laminated resonator of the present invention can be used as a resonance element for stabilizing the oscillation frequency of a high-frequency oscillation circuit such as CO).

Further, in the above description, the present invention is
The configuration is not limited to the configurations shown in the respective embodiments, and various modifications and rearrangements are obvious to the expert.
It is to be understood that such modifications and changes are included in the scope of the present invention without departing from the spirit and gist of the present invention described in the claims.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a dielectric laminated resonator according to a first embodiment of the present invention and a sectional view taken along line XX ′.

FIG. 2 is an exploded perspective view and a sectional view taken along line XX ′ of a dielectric laminated resonator according to a second embodiment of the present invention.

FIG. 3 is an exploded perspective view of a dielectric laminated resonator according to a third embodiment of the present invention, a cross-sectional view taken along line XX ′, and an equivalent circuit diagram for explaining the operation.

FIG. 4 is an exploded perspective view of a dielectric laminated resonator according to a modification of the third embodiment of the present invention and a sectional view taken along line XX ′.

FIG. 5 is an exploded perspective view and a sectional view taken along line XX ′ of a dielectric laminated resonator according to another modification of the third embodiment of the present invention.

FIG. 6 is an exploded perspective view of a dielectric filter according to a fourth embodiment of the present invention and an equivalent circuit diagram for explaining the operation.

FIG. 7 is an exploded perspective view of a dielectric laminated resonator according to a fifth embodiment of the present invention and a sectional view taken along line XX ′.

FIG. 8 is an exploded perspective view of a dielectric multilayer resonator including a capacitance electrode, a cross-sectional view taken along line XX ′, and an equivalent circuit diagram for explaining the operation.

FIG. 9 is an exploded perspective view of another dielectric laminated resonator including a capacitive electrode, a cross-sectional view taken along line XX ′, and an equivalent circuit diagram for explaining the operation.

FIG. 10 is an exploded perspective view of a dielectric laminated resonator according to a sixth embodiment of the present invention and a sectional view taken along line XX ′.

FIG. 11 is an exploded perspective view of a dielectric laminated resonator according to a seventh embodiment of the present invention.

FIG. 12 is a sectional view taken along line XX ′ of the dielectric multilayer resonator according to the seventh embodiment of the present invention.

FIG. 13 is an exploded perspective view of a dielectric laminated resonator according to an eighth embodiment of the present invention, a sectional view taken along line XX ′, and an equivalent circuit diagram for explaining the operation.

FIG. 14 is an exploded perspective view of a dielectric filter according to a ninth embodiment and an equivalent circuit diagram for explaining the operation.

FIG. 15 is an exploded perspective view of a conventional dielectric laminated resonator and a sectional view taken along line XX ′.

FIG. 16 is an exploded perspective view of an antenna duplexer including a conventional dielectric filter.

[Explanation of symbols]

1 First dielectric sheet 2 First strip line 2a wide part 2b narrow part 3 Second dielectric sheet 4 Second stripline 5 Top dielectric sheet 6 Lowermost dielectric sheet 7a First shield electrode 7b Second shield electrode 8 connection electrodes 9 Ground electrode 11,12 Dielectric sheet 13, 13a, 13b coupling electrodes 14 Resonator 15,15a, 15b 20,23 capacitors 16 Third Strip Line 17 Side shield electrode 18 Third Dielectric Sheet 19 Capacitance electrode 22 Second capacitance electrode 41 terminal electrode 42 Side electrode 61 Second side shield electrode 62 Through hole electrode 110a, 110b 220a, 220b Dielectric multilayer resonator 224 air core coil

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-97705 (JP, A) JP-A-5-243823 (JP, A) JP-A-5-29817 (JP, A) JP-A-3- 71710 (JP, A) JP-A-5-275903 (JP, A) JP-A-56-46302 (JP, A) JP-A-6-45803 (JP, A) Actual Kaihei 5-36901 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01P 7/08 H01P 1/203 H01P 1/205 H01P 1/212

Claims (36)

(57) [Claims] 1. A first dielectric sheet and a second dielectric sheet, a first strip line formed on the upper surface of the first dielectric sheet, and an upper surface of the second dielectric sheet. A second strip line formed, the second dielectric sheet is laminated on the first dielectric sheet, and the first dielectric sheet and the second dielectric sheet are formed. The laminated body is further laminated with the uppermost and lowermost dielectric sheets arranged above and below the first laminated body to form the first laminated sheet.
Between the strip line and the second strip line, only the second dielectric sheet exists, a first shield electrode provided on a lower surface of the lowermost dielectric sheet, and the uppermost layer. A second shield electrode provided on the upper surface of the dielectric sheet, a connection electrode connecting one end of the first strip line and one end of the second strip line, and the other of the first strip line A ground electrode whose end is grounded, the other end of the second strip line is open, and the separation t1 between the first shield electrode and the first strip line is the first strip line and the second strip line. The distance between the strip line and the strip line and the distance between the second strip line and the second shield electrode are different from each other. 2. A first dielectric sheet, a second dielectric sheet and a third dielectric sheet, a first strip line formed on an upper surface of the first dielectric sheet, and the second dielectric sheet. A second strip line formed on the upper surface of the dielectric sheet, and a capacitive electrode formed on the upper surface of the third dielectric sheet, the first, second and third dielectric sheets Is laminated such that the third dielectric sheet is sandwiched and the arrangement regions of the first strip line, the second strip line and the capacitor electrode are vertically overlapped with each other. And the third dielectric sheet is further laminated, and the laminate is further laminated with the uppermost and lowermost dielectric sheets disposed above and below the third dielectric sheet, and the first dielectric sheet provided on the lower surface of the lowermost dielectric sheet. 1 shield electrode and the uppermost dielectric shield A second shield electrode provided on the upper surface of the second strip line, and a connection electrode connecting one end of the first strip line and one end of the second strip line, and the other end of the second strip line. Is open and has a ground electrode that grounds the other end of the first strip line and the capacitance electrode, and in the laminated body sandwiching the third dielectric sheet, the length of the second strip line is Is set so as not to cover the vicinity of the other end on the ground side of the first strip line, and the capacitance electrode is arranged so as not to cover the vicinity of the other end on the ground side of the first strip line. The distance t1 between the first shield electrode and the first strip line is equal to the distance t2 between the first strip line and the second strip line, and between the second strip line and the second shield electrode. Separation t3 The dielectric laminated resonators are characterized in that they are set to different distances. 3. A first dielectric sheet and a plurality of other dielectric sheets; a first strip line formed on the first dielectric sheet; and a plurality of the other dielectric sheets. Capacitance electrodes formed on some of the dielectric sheets, and second strip lines formed on the remaining dielectric sheets of the other plurality of dielectric sheets, respectively. A plurality of dielectric sheets having electrodes formed thereon and a plurality of dielectric sheets having the second strip lines formed thereon are alternately laminated, and the plurality of dielectric sheets are laminated alternately. The first dielectric sheet is further laminated under the body, and the arrangement areas of the first strip line, the second strip lines, and the capacitance electrodes are vertically overlapped with each other. In the dielectric sheet, The length of the second strip line is set short so as not to cover the vicinity of the other end on the ground side of the first strip line, and each of the capacitance electrodes is connected to the other end on the ground side of the first strip line. The laminated body and the first dielectric sheet are arranged so as not to cover the vicinity thereof, and further, the uppermost layer dielectric and the lowermost dielectric layer disposed above the laminated body and below the first dielectric sheet, respectively. A first shield electrode laminated on the sheet and provided on the lower surface of the lowermost dielectric sheet; a second shield electrode provided on the upper surface of the uppermost dielectric sheet; and the first strip. Each of the second strips has a connection electrode that connects one end of a line and one end of each of the second strip lines, and a ground electrode that grounds the other end of the first strip line and each capacitance electrode. The other end of the track The separation t1 between the first shield electrode and the first strip line is the distance t2 between the first strip line and each second strip line, and the separation t2 between each second strip line and the second strip line. A dielectric laminated resonator characterized in that it is set to a distance different from the distance t3 from the shield electrode. 4. A first dielectric sheet and a plurality of other dielectric sheets; a first strip line formed on the first dielectric sheet; and a plurality of the other dielectric sheets. Capacitance electrodes formed on some of the dielectric sheets, and second strip lines formed on the remaining dielectric sheets of the other plurality of dielectric sheets, respectively. A plurality of dielectric sheets on which electrodes are formed and a plurality of dielectric sheets on which the respective second strip lines are formed are alternately laminated, and the plurality of dielectric sheets are alternately laminated. The first dielectric sheet is laminated on half of the body, and the other half of the laminate is further laminated on the first dielectric sheet, the first strip line, each second strip. The line and the placement area of each capacitance electrode are mutually In the laminated body and the first dielectric sheet, the length of each of the second strip lines is set short so as not to cover the vicinity of the other end on the ground side of the first strip line. Each of the capacitor electrodes is arranged so as not to cover the vicinity of the other end on the ground side of the first strip line, and the laminated body and the first dielectric sheet are further arranged above the laminated body and A first shield electrode which is laminated on the uppermost and lowermost dielectric sheets respectively arranged below, and which is provided on the lower surface of the lowermost dielectric sheet; and on the upper surface of the uppermost dielectric sheet. A second shield electrode, a connection electrode that connects one end of the first strip line and one end of each of the second strip lines, and the other end of the first strip line and each capacitance electrode to ground. With the ground electrode The other end of each of the second strip lines is open, and the separation t1 between the first shield electrode and the first strip line is the separation between the first strip line and each second strip line. , and a separation t3 between the respective second strip lines and the second shield electrode are set to be different from each other. 5. The separations t1, t2, t3 are t1> t2.
The relation of> t3, Claim 1,
The dielectric laminated resonator according to claim 2, claim 3 or claim 4 . 6. A first dielectric sheet and a second dielectric sheet.
And a third dielectric sheet, and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
The interval t4 is the first strip line and the third strip line.
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, the first, second and third dielectric sheets and the front
In the laminated body in which the uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
Cage, wherein each separation t1, t2, t3, and the separation t4, t5,
The dielectric laminated resonator characterized in that t6 has a relationship of t1>t2> t3 and t4>t5> t6. 7. The separations t1, t2, t3 are t1> t3.
2. The relation of> t2, Claim 1,
The dielectric laminated resonator according to claim 2, claim 3 or claim 4 . 8. The separations t1, t2, t3 are t1 = t2.
Claims 1 and 2, characterized in that the relationship is + t3.
The dielectric laminated resonator according to claim 2, claim 3 or claim 4 . 9. The length L of the second stripline is the first
Let L1 be the length of the stripline of 0.2L1 ≤
L <= 0.65L1 is set, The dielectric laminated resonator of Claim 1, Claim 2, Claim 3 or Claim 4 characterized by the above-mentioned. 10. A first dielectric sheet and a second dielectric sheet.
And a third dielectric sheet, and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
The interval t4 is the first strip line and the third strip line.
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, the first, second and third dielectric sheets and the front
In the laminated body in which the uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
Cage, each length of the second strip line and the third strip line is L, and the length of the first strip line as L1, and characterized in that it is set to 0.2L1 ≦ L ≦ 0.65L1 Dielectric laminated resonator. 11. The length L of the second strip line is 0.2L1 where L1 is the length of the first strip line.
5. The dielectric laminated resonator according to claim 1, claim 2, claim 3 or claim 4, wherein ≦ L ≦ 0.5L1 is set. 12. A first dielectric sheet and a second dielectric sheet.
And a third dielectric sheet, and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
The interval t4 is the first strip line and the third strip line.
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, the first, second and third dielectric sheets and the front
Serial in laminate uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
Cage, each the length L of the second strip line and the third strip line is a length of the first strip line as L1, and characterized in that it is set to 0.2L1 ≦ L ≦ 0.5L1 Dielectric laminated resonator. 13. The length L of the second strip line is 0.2L1 where L1 is the length of the first strip line.
The dielectric multilayer resonator according to claim 1, 2, 3, or 4, wherein ≤L≤0.35L1 is set. 14. A first dielectric sheet and a second dielectric sheet.
And a third dielectric sheet, and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
Interval t4, the first strip line and the third strip line
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, the first, second and third dielectric sheets and the front
In the laminated body in which the uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
Cage, each the length L of the second strip line and the third strip line is a length of the first strip line as L1, and characterized in that it is set to 0.2L1 ≦ L ≦ 0.35L1 Dielectric laminated resonator. 15. One end of the first strip line, to which the connection electrode is connected, is formed in a wide portion having a wide line width, and the other end of the first strip line, which is grounded, has a line width. 2. The line width from the middle of the first strip line to the grounded other end side of the first strip line is set to be narrow.
The dielectric laminated resonator according to claim 2, claim 3 or claim 4 . 16. A first dielectric sheet and a second dielectric sheet.
And a third dielectric sheet, and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
The interval t4 is the first strip line and the third strip line.
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, to the first, second and third dielectric sheets and the front.
In the laminated body in which the uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
And one end to which the connection electrode of the first stripline is connected
The side is formed in a wide portion with a wide track width, and
The other end of the strip line of 1 that is grounded has a narrow line width.
It is formed in a small width and is in the middle of the first strip line.
, The line width to the other grounded side is set to be narrow.
A dielectric laminated resonator characterized by the following. 17. The top and bottom dielectric sheets are:
2. The shield electrode is further laminated with two dielectric sheets arranged above and below the shield sheet, and each shield electrode is formed as an inner electrode sandwiched between the two dielectric sheets. The dielectric laminated resonator according to claim 2, claim 3, or claim 4 . 18. The dielectric according to claim 1, claim 2, claim 3 or claim 4 , wherein each shield electrode is formed as an outer electrode located on the surface of the dielectric laminated resonator. Body laminated resonator. 19. The capacitor according to claim 1, further comprising one or a plurality of coupling electrodes coupled to an external circuit, wherein the coupling electrodes and the second strip line constitute a capacitor. The dielectric laminated resonator according to claim 2, claim 3 or claim 4 . 20. The dielectric laminated resonator according to claim 19 , wherein the coupling electrode is formed as an outer electrode located on the surface of the dielectric laminated resonator. 21. The dielectric laminated resonator according to claim 19 , wherein the coupling electrode is formed as an inner electrode arranged between two dielectric sheets. 22. The terminal electrodes are provided in the same number as the coupling electrodes and are connected to the corresponding coupling electrodes, and the terminal electrodes are formed as outer electrodes located on the surface of the dielectric laminated resonator. 20. The dielectric laminated resonator according to claim 19 . 23. The dielectric laminated resonator according to claim 19 , wherein the coupling electrode is formed on a surface of the dielectric sheet on which the shield electrode is formed. 24. Side shield electrodes provided on both side surfaces of each dielectric sheet, wherein the side shield electrodes are formed as outer electrodes located on the surface of the dielectric laminated resonator, and the first shield electrode is provided. And the second shield electrode
It is connected to each other via the side shield electrode, claim 1, claim 2, claim 3 or claim.
4. The dielectric laminated resonator according to 4 . 25. Each strip line extends from an end of each dielectric sheet provided with them, and a connection electrode is provided on a side surface of the end of each dielectric sheet, and a second strip line is provided. the length of the claims 1, claim 2, characterized in that it is shorter than the first strip line, wherein
The dielectric laminated resonator according to claim 3 or 4 . 26. The connection electrode is a through-hole electrode formed on the second dielectric sheet, and one of the ends of the first and second strip lines on the side connected by the through-hole electrode. The portion is located inside the end portions of the first and second dielectric sheets, and the second side surface shield electrode is arranged at the end portions of the first and second dielectric sheets.
Claim 1, claim 2 to the other end portion of the first and second dielectric sheets being arranged ground electrode,請
The dielectric laminated resonator according to claim 3 or claim 4 . 27. A first dielectric sheet and a second dielectric sheet.
And a third dielectric sheet, and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
The interval t4 is the first strip line and the third strip line.
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, the first, second and third dielectric sheets and the front
In the laminated body in which the uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
Cage, the connection electrode is a second dielectric sheet and the third dielectric through-hole electrode formed in a sheet, first, the through-hole electrodes of the both ends of the second and third stripline The end portions on the side connected by are located inside the end portions of the first, second and third dielectric sheets, and the end portions of the first, second and third dielectric sheets are A dielectric laminated resonator, wherein a second side shield electrode is arranged, and a ground electrode is arranged at the other ends of the first, second and third dielectric sheets. 28. An electrode region having a width wider than the line width of the first strip line is formed at a ground side end of the first strip line, and the first strip line has an electrode region through the electrode region. 5. The dielectric laminated resonator according to claim 1, claim 2, claim 3 or claim 4, which is connected to a ground electrode. 29. A first dielectric sheet and a second dielectric sheet.
And a third dielectric sheet, and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
The interval t4 is the first strip line and the third strip line.
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, the first, second and third dielectric sheets and the front
In the laminated body in which the uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
And the first stripline has the first stripline on the ground side end.
A wide electrode area wider than the line width of the strip line of
And the first strip line is formed through the electrode region.
And laminated to the ground electrode
Resonator. 30. A dielectric filter comprising a plurality of dielectric laminated resonators according to claim 19 , which are connected in cascade. 31. A plurality of dielectric laminated resonators, wherein each dielectric laminated resonator comprises a first dielectric sheet, a second dielectric sheet and a third dielectric sheet.
An electrical sheet and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
The interval t4 is the first strip line and the third strip line.
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, the first, second and third dielectric sheets and the front
In the laminated body in which the uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
And one or more coupling electrodes that are coupled to an external circuit.
Has a pole, by the coupling electrode and the second strip line
A plurality of dielectric laminated resonators each comprising a capacitor and having the capacitor
Are connected in cascade to form a dielectric layer.
Ilta. 32. A dielectric filter comprising a plurality of dielectric laminated resonators according to claim 22 , which are cascade-connected. 33. A plurality of dielectric laminated layers connected in cascade.
Each shaker is provided in the same number as the number of coupling electrodes and connected to the corresponding coupling electrodes
Has a terminal electrodes, the terminal electrodes has an outer located at the surface of the dielectric laminated resonator
According to claim 31, characterized in that it is formed as an electrode
Dielectric filter. 34. A plurality of dielectric laminated resonators,
33. A claim 30, a claim 31, a claim 32, or a claim 33, which are connected in series via an inductance.
The dielectric filter described. 35. A first dielectric sheet and a second dielectric sheet.
And a third dielectric sheet, and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
The interval t4 is the first strip line and the third strip line.
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, the first, second and third dielectric sheets and the front
In the laminated body in which the uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
Cage, the connection electrode, the dielectric laminated resonator, characterized in that it is used as a connection terminal with an external circuit. 36. A first dielectric sheet and a second dielectric sheet.
And a third dielectric sheet, and a first strike formed on the upper surface of the first dielectric sheet.
A lip line and a second strike formed on the upper surface of the second dielectric sheet.
A lip line and a third strike formed on the upper surface of the third dielectric sheet.
And a lip line, wherein the first, second and third dielectric sheets have the first
The dielectric sheet is the second dielectric sheet and the third dielectric sheet.
A laminate in which the first, second, and third dielectric sheets are laminated in a state of being sandwiched by a sheet from above and below.
The body is the uppermost dielectric sheet placed above it.
And a first sheet provided on the lower surface of the third dielectric sheet.
Field electrode and a second shield provided on the upper surface of the uppermost dielectric sheet.
Shield electrode, one end of the first strip line and the second strip line.
Connect one end of the track line to one end of the third strip line.
A continuous connection electrode, and a ground electrode that grounds the other end of the first strip line
And the other ends of the second and third strip lines are open, and the first shield electrode and the first strip line are separated from each other.
The interval t1 is the first strip line and the second strip line.
The separation t2 from the line and the second strip line and the second line
It is set to a distance different from the distance t3 from the shield electrode and separates the second shield electrode from the first strip line.
The interval t4 is the first strip line and the third strip line.
The separation t5 from the line, and the third strip line and the first line
It is set to a distance different from the distance t6 from the shield electrode, and further, the first, second and third dielectric sheets and the front
In the laminated body in which the uppermost dielectric sheet is laminated,
The first, second and third strip lines and the first and second strip lines
And both sides of the second shield electrode in the width direction,
Side shield electrodes are formed as outer electrodes on the entire surface
And further has two coupling electrodes coupled to an external circuit,
A dielectric laminated resonator characterized in that a capacitor is constituted by the coupling electrode and the second strip line .