JP2000312104A - Dielectric resonance component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dielectric resonance component whose resonance frequency can be adjusted stepwise over a wide range, in a short time. SOLUTION: This dielectric resonance component is formed by placing an internal line conductor 2 between layers of a laminate 1 consisting of laminating a plurality of dielectric ceramic layers 1a, 1b, placing an outer conductor film 3 onto at least both major sides of the laminate 1, and connecting one end of the inner line conductor 2 to the outer conductor films 3. Then a capacitance adjustment electrode 4 connected to the outer conductor film 3 is placed on one major side of the laminate 1 by using a narrow trimming connection section 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric laminated stripline resonator and a dielectric resonant component used in the dielectric laminated stripline filter, and more particularly, to a method for quickly adjusting resonance characteristics. A possible dielectric resonant component.

[0002]

2. Description of the Related Art Conventionally, a device such as a cellular phone using microwaves is frequently used as a dielectric laminated strip line resonator or a filter because of its small size and high functionality. In the present invention, these resonators and filters are referred to as dielectric resonator components. For example, a dielectric laminated strip line resonator has a laminate formed by laminating a plurality of dielectric layers, a band-shaped internal line conductor formed inside the laminate,
And an outer conductor film formed on at least both main surfaces of the laminate, and one end of the inner line conductor is connected to the outer conductor film. Specifically, one end of the internal line conductor is connected to the outer conductor film via the end face of the laminated body and also via the via-hole conductor, and one end side is a short-circuit end,
The other end is an open end. Note that the open end of the internal line conductor is led out to the end face of the laminated body where the outer conductor film is not formed, and external terminal electrodes and the like are formed.

The laminated dielectric strip line resonator connected to the outer conductor film via the via hole conductor described above is manufactured by the following method.

First, a dielectric ceramic green sheet that can be fired at a low temperature is prepared. Then, a through-hole serving as a via-hole conductor of a short-circuit conductor is formed at a predetermined position on the dielectric ceramic green sheet, and the through-hole is filled with a conductive paste such as copper. In addition, on a predetermined dielectric green sheet,
A strip-shaped conductor film serving as an internal line conductor is formed by printing the above-mentioned conductive paste. Thereafter, a predetermined number of dielectric green sheets are laminated and integrated on each of both main surfaces of the predetermined dielectric green sheet, and the dielectric layer and the internal line conductor are subjected to a firing process at a time. Thereafter, end electrodes connected to the open ends of the outer conductor film and the internal line conductor are formed on the outer surface of the laminate except for the open end surfaces of the fired laminate by baking a conductive paste. Note that the outer conductor film may be formed on at least both main surfaces of the laminate, and when the connection between the short-circuit end of the internal line conductor and the outer conductor film is not performed using the via-hole conductor, the laminate is opened. The end face located on the short-circuit end side opposite to the end face may be used for connection with an end face conductor film (short-circuit conductor film).

[0005] In the strip line resonator thus formed, a step of adjusting its characteristics after mounting on a predetermined wiring circuit board is indispensable.

[0006] This is because variations in the material constants of the dielectric ceramic and the conductor material, variations in conditions during firing in the above-described manufacturing process, and the like, misprinting of the conductive paste serving as the internal line conductor, bleeding of the conductor, It is very difficult to set the resonance frequency to the design value due to a shift in the formation position of the short-circuit conductor such as a via-hole conductor.

A conventional frequency adjusting method is, for example, as described in JP-A-5-29818, in which a part of an outer conductor facing an open end of an internal line conductor or a short-circuit end of an internal line conductor is removed. Then, by a trimming process such as laser irradiation or a sandblasting method, the film is removed into a predetermined shape and a contour shape.

If the outer conductor film located on the open end side of the inner line conductor is trimmed, the parallel capacitance component of the resonance circuit decreases in proportion to the removal area and the contour shape.
As a result, the resonance frequency of the resonator shifts to the high frequency side.

Further, when trimming is performed on the outer conductor film located on the short-circuit end side of the inner line conductor, the path of the current flowing through the outer conductor film changes.
The direction is opposite to the current flowing through the internal line conductor. For this reason, the resonance frequency of the resonator has been reduced to a lower frequency side by trimming the outer conductor film on the short-circuit end side and reducing the current flowing in the outer conductor film in the direction opposite to that of the inner line conductor.

Japanese Patent Application Laid-Open No. 5-29818 describes that a plurality of slots having a predetermined width are formed in an outer conductor film region facing an open end or a short end of an internal line conductor. Then, a capacitance element is connected between the slots, and the resonance frequency of the resonator is changed by changing the capacitance value.

[0011]

In the above-described method of removing the outer conductor film, it is necessary to remove the outer conductor film by a predetermined area so as to have a predetermined resonance frequency or to remove the outer conductor film in a contour shape. It is necessary to adjust the trimming removal amount according to the area and the removal shape, so that the trimming process is very complicated. For example, in adjusting the resonance frequency from the initial resonance frequency to the predetermined resonance frequency, when the difference between the frequencies is large, it is necessary to perform the trimming process on a considerably large area.

In the method in which a slot must not be formed, it is necessary to trim a relatively large area, and furthermore, a capacitor element is required in addition to the resonator, which leads to an increase in cost, size, and height. It will be difficult.

The present invention has been devised in view of the above problems, and has as its object to provide a dielectric resonance component capable of adjusting a resonance frequency in a wide range and stepwise in a short time. is there.

[0014]

According to the present invention, an internal line conductor is arranged between layers of a laminate comprising a plurality of dielectric ceramic layers, and an outer conductor film is arranged on at least both main surfaces of the laminate. In the dielectric resonance component formed by connecting one end of the internal line conductor to the outer conductor film, a capacitance adjusting portion connected to the outer conductor film by a narrow trimming connection portion on one main surface of the laminate. A dielectric resonance component comprising a plurality of electrodes.

Further, between the capacitance adjusting electrode and the internal line conductor in the laminated body, the capacitance adjusting electrode portion and the via-hole conductor are connected, and the internal line conductor is opposed to the internal line conductor via a dielectric layer. This is a dielectric resonance component on which high-capacity forming electrodes are arranged.

Further, a plurality of the capacitance adjusting electrode portions are connected via a trimming connection portion.

[0017]

According to the first aspect of the present invention, there are provided a plurality of capacitance adjusting electrodes connected to the outer conductor film by the trimming connection. Then, according to the initial resonance frequency of the dielectric resonance component, a predetermined number of capacitance adjusting electrodes out of the plurality of capacitance adjusting electrodes connected to the outer conductor film are separated from the outer conductor film.
As a result, the capacitance component between the inner line conductor and the outer conductor film decreases, and the resonance frequency can be shifted to a higher frequency.

This disconnection process is performed by disconnecting a narrow trimming connecting portion connecting the outer conductor film and the capacitance adjusting electrode.

That is, the capacitance adjusting electrode having the same potential as that of the outer conductor film can be separated from the outer conductor film by trimming a short distance so as to traverse the narrow connection conductor film. This makes it possible to perform a process of adjusting the resonance frequency wider than in the past with very short trimming.

According to a second aspect of the present invention, a high-capacity forming electrode is connected between the capacitance-adjusting electrode and the internal line conductor, and is connected to the capacitance-adjusting electrode portion and faces the internal line conductor via a dielectric layer. Has been arranged. That is, the high capacitance forming electrode is connected to the outer conductor film via the trimming connection portion and the capacitance adjusting electrode portion. The capacitance component generated between the high capacitance forming electrode and the internal line conductor is larger than the capacitance component between the capacitance adjusting electrode and the internal line conductor in the first conventional invention. Become.

Therefore, by separating the capacitance adjusting electrode connected to the high capacitance forming electrode from the outer conductor film, it is possible to change the capacitance component larger than in the first invention, and as a result, the resonance frequency can be broadened. Frequency adjustment becomes possible.

Further, since the amount of trimming necessary for this adjustment is achieved by trimming across the trimming connection as in the first invention, it is possible to achieve a large change in resonance frequency with very short trimming. Can be.

In the third invention, a plurality of capacitance adjusting electrodes are connected in series via a trimming connection. The capacitance adjusting electrode at one end is connected to the outer conductor via a trimming connection. In other words, if the trimming connection that connects the outer conductor film and the capacitance adjustment electrode is trimmed, all the capacitance adjustment electrodes that are connected in series after the trimming connection are separated from the outer conductor film, and large resonance occurs. The frequency can be adjusted.

Further, if the trimming connection portion between the connected capacitance adjusting electrodes is trimmed, if a portion of the plurality of capacitance adjusting electrodes is trimmed across the outer conductor film, a part of the capacitance adjusting electrodes may be trimmed. The electrode is left in a state of being connected to the outer conductor film, and the other capacitance adjusting electrodes are separated from the outer conductor film, so that the adjustment amount of the resonance frequency is smaller than that described above.

That is, according to the structure of the dielectric resonance component having the above-described structure, the dielectric resonance component can adjust the resonance frequency in a short time in a wide range and stepwise.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a dielectric resonance component of the present invention will be described in detail with reference to the drawings. The dielectric resonance component of the present invention will be described using a dielectric laminated stripline resonator that is a dielectric resonance component.

FIG. 1 is a plan view of a dielectric laminated strip line resonator of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, FIG. 3 is an exploded perspective view thereof, and FIG. FIG. 4 is a partial plan view for explaining a frequency adjustment method.

1 to 3, reference numeral 1 denotes a dielectric layer 1a;
1b, a reference numeral 2 denotes an internal line conductor, a reference numeral 3 denotes an outer conductor film, and a reference numeral 4 denotes a capacitance adjusting electrode.

The laminate 1 has at least two dielectric layers 1
a and 1b are laminated. For example, BaO-
TiO ₂ system, Ca-TiO ₂ system, a dielectric ceramic material of MgO one TiO ₂ system or the like, BiVO _4, CuO order to enable low-temperature sintering, Li ₂ O, oxides such as B ₂ O ₃ is added Have been. The thickness of each of the dielectric layers 1a and 1b is about 50 to 300 μm.
An internal line conductor 2 extending like a strip in the longitudinal direction of the laminated body 1 is disposed between the layers. The outer conductor film 3 is substantially formed on the outer surface of the multilayer body 1 except for the end face (open end face F) of the multilayer body 1 where one end of the internal line conductor 2 is exposed.

The inner line conductor 2 and the outer conductor film 3 are made of a low resistance mainly composed of an Ag-based material (Ag alone or an Ag alloy such as Ag-Pd or Ag-Pt) or a Cu-based material (A simple Cu or Cu alloy). It is made of a conductive material.

As a result, the other end of the internal line conductor 2 is short-circuited to the outer conductor film (short-circuit conductor film) formed on the end face G facing the open end face F of the multilayer body 1. A capacitance component is formed between the outer conductor films 3 on both main surfaces of the multilayer body 1 in a distributed constant manner.

The outer conductor film 3 is connected to the ground potential, and the open end side of the inner line conductor 2 is used as a signal input portion, thereby forming an LC resonance circuit with a distributed constant. It becomes a dielectric resonator.

In this embodiment, a capacitance adjusting electrode 4 connected to the outer conductor film 3 is formed in a region of the one main surface of the laminate 1 where the outer conductor film 3 is formed. That is, the capacitance adjusting electrode 4 has, for example, a rectangular shape and is connected between each side of the capacitance adjusting electrode 4 and the outer conductor film 3 by the trimming connection portion 5. That is, the capacitance adjusting electrode 4 is defined by four substantially L-shaped insulating regions 6 formed intermittently around the electrode 4. However, the capacitance adjusting electrode 4 is connected to the outer conductor film 3 by the trimming connection portion 5, and initially operates at the same potential as the outer conductor film 3. The capacitance adjusting electrode 4 and the trimming connection part 5 are formed of the same material and in the same process as the outer conductor film 3 formed on the main surface of the laminate 1. For example, selective deposition according to the shape of the capacitance adjusting electrode 4 and the trimming connection portion 5 or formation of a printing / coating film using a resist film so that the conductor film is not deposited on the insulating region 6, It is formed by an appropriate etching process.

When the resonance frequency of such a dielectric resonator is adjusted (increased in frequency), the capacitance adjusting electrode 4 is electrically disconnected from the outer conductor film 3 as shown in FIG. The trimming connection portion 5 extending to each side of the adjustment electrode 4 is cut along a cutting line x. This allows
The opposing area between the inner line conductor 2 and the outer conductor film 3 is reduced by the area of the capacitance adjusting electrode 4, and as a result, the resonance frequency can be increased. Specifically, the trimming connection unit 5
The trimming connection portion 5 is cut and removed by laser irradiation, sand blasting, or the like so as to cross the line.

In the present embodiment, when adjusting the resonance frequency, the capacitance adjusting electrode 4 having a very large area is cut off from the outer conductor film 3 by cutting the trimming connection portion 5 across the narrow width so as to cross the outer conductor film 3. The components can be reduced. In other words, by a very short trimming process,
A large resonance frequency can be adjusted.

Further, for example, when the trimming process is performed by laser irradiation or sandblasting, the trimming start point is located in the insulating region 6, so that an unnecessary removed portion is not formed in the outer conductor film 3, and For example, the scanning for cutting can be performed after the state of laser irradiation or the state of the sandblast is stabilized.

Further, the amount of increase in the resonance frequency can be grasped in advance by the area of the electrode 4 for capacitance adjustment. If it is slightly lower, fine adjustment for trimming a part of the region of the outer conductor film 3 facing the inner line conductor 2 as in the conventional frequency adjustment may be performed.

FIG. 5 is a partial plan view of an outer conductor film showing another embodiment of the capacitance adjusting electrode.

In this embodiment, a plurality of, for example, three capacitance adjusting electrodes 41 to 43 are formed. Although not shown in the figure, the capacitance adjusting electrodes 41 to 43 are arranged along the extending direction of the internal line conductor 2 and face the internal line conductor 2 via the dielectric layer 1a. I have.

The capacitance adjusting electrodes 41 to 43 are respectively connected to the trimming connection portions 5 extending in the same direction (upward in the drawing).
1 to 53 are formed, and the trimming connection portions 51 to 53 are formed.
Is connected to the outer conductor film 3 by a node. That is, the trimming connection portions 51 to 53 correspond to the straight cutting line X in FIG.
Are arranged so that they all intersect.

Therefore, depending on the number of capacitance adjusting electrodes to be electrically separated from the outer conductor film 3 according to the initial resonance frequency of the resonator, for example, only the capacitance adjusting electrode 41 is cut by cutting the trimming connection portion 51. To separate
Whether the two capacitance adjustment electrodes 41 and 51 are separated by cutting the two trimming connection portions 51 and 52, or all the capacitance adjustment electrodes 41 to 43 are separated by cutting all the trimming connection portions 51 to 53. Choose Then, for example, the scanning distance of laser irradiation may be set along the cutting line x according to the number of cuts of the selected trimming connection portion.

As described above, in FIG. 5, for example, the cutting line x for scanning by laser irradiation can be set on a straight line, and a wide frequency can be set according to the scanning distance (the number of cuts of the trimming connection portion). Adjustments can be made in stages.

Of course, after such a stepwise adjustment of the frequency adjustment, fine adjustment of the resonance frequency may be performed by performing a scan trimming process on a part of the outer conductor film 3 as in the prior art. .

Although FIG. 5 shows a structure in which a plurality of capacitance adjusting electrodes are arranged in one row, two or more rows, that is, the capacitance adjusting electrodes may be arranged in a matrix.

FIG. 5 shows that each of the capacitance adjusting electrodes 41 to 43
It operates as a single capacity adjustment, but as shown in FIG.
Each of the capacitance adjusting electrodes 44 to 46 is connected to a trimming connecting portion 54 to
They are connected in series via 54.

That is, the capacitance adjusting electrode 44 is connected to the capacitance adjusting electrode 45 via the trimming connection part 54.
The capacitance adjusting electrode 45 is connected to the capacitance adjusting electrode 46 via a trimming connection 55. Further, the capacitance adjusting electrode 46 is connected to the outer conductor film 3 via a trimming connection 56.

In such a structure, the resonance frequency of the resonator can be adjusted by cutting a predetermined one of the trimming connection portions 54 to 56, whereby the three resonance frequencies can be adjusted stepwise and broadly.

For example, when the cutting of the trimming connection portion is one of the trimming connection portions 54 (the cutting line X1
), Only the capacitance adjusting electrode 44 is separated from the outer conductor film 3.

For example, when the cutting of the trimming connection portion is one of the trimming connection portions 55 (the cutting line X2
), The two capacitance adjusting electrodes 44 and 45 are simultaneously separated from the outer conductor film 3.

For example, when the cutting of the trimming connection portion is one of the trimming connection portions 56 (the cutting line X3
), Three capacitance adjusting electrodes 44 to
The 46 cuts are separated simultaneously.

In the structure shown in FIG. 6, by trimming a predetermined one trimming connection portion as compared with FIG. 5, a wide stepwise adjustment of three resonance frequencies becomes possible.

FIG. 7 shows three capacitance adjusting electrodes 47 to 49.
However, capacitance adjusting electrodes are connected in series as shown in FIG. In this embodiment, the trimming connecting portions 57 to 59 are arranged so as to be located on a straight line connecting the cutting lines x4, x5, x6.

In such a structure, by trimming a predetermined one of the trimming connecting portions 57 to 59 in the same manner as in FIG. 6, a stepwise wide frequency adjustment of the three resonance frequencies becomes possible. Moreover, in this structure, each trimming connection 5
Since the cutting lines x4, x5 and x6 of 7 to 59 are connected in a straight line, scanning control such as laser irradiation or sandblasting can be relatively easily performed.

Further, for example, even when the first cutting is performed on the basis of the cutting line x5 and the two capacitance adjusting electrodes 47 and 48 are separated from the outer conductor film 3, a sufficient increase in the resonance frequency is observed. If not, the trimming scan is continued as it is, and the capacitance adjusting electrode 49 is also connected to the outer conductor film 3 based on the cutting line x6.
Can be separated from

As described above, according to the present invention, there is provided a dielectric resonance component capable of adjusting the resonance frequency in a wide range and stepwise by a short trimming process.

Further, as shown in FIGS. 6 and 7, by arranging the capacitance adjusting electrodes 44 to 49 in series by using the trimming connecting portions 54 to 59, one trimming connecting portion 54 is provided. By the trimming processing of ~ 59, the resonance frequency can be approximated to the predetermined resonance frequency, and the time required for adjusting the resonance frequency can be greatly shortened.

FIGS. 8 and 9 show another embodiment of the present invention. FIG. 8 (a) is a plan view of a dielectric laminated strip line resonator, and FIG. B in 8 (a)
FIG. 8C is a sectional view taken along the line B, and FIG.
FIG. 9 is an exploded perspective view of FIG.

In the resonator of this embodiment, a high-capacity forming electrode 7 is disposed between the internal line conductor 2 and the outer conductor film 3 (capacity adjusting electrode 4). And the capacitance adjusting electrode 4 are connected by a via-hole conductor 8 in the thickness direction of the multilayer body 1.

The laminate 1 is composed of at least three or more dielectric layers 1a1, 1a2 and 1b. The internal line conductor 2 is formed of a strip-shaped conductor film extending in the longitudinal direction of the multilayer body 1 between the dielectric layers 1a2 and 1b. The high-capacity forming electrode 7 is formed of a dielectric layer 1a1.
1a1 is formed extending from the open end of the internal line conductor 2 in the width direction of the internal line conductor 2.
The outer conductor film 3 is formed on the outer surface of the laminate 1 except for the open end surface. Further, a part of the region of the outer conductor film 3,
That is, on the upper side of the high capacity forming electrode 7, the capacity adjusting electrode 4 connected to the outer conductor film 3 by the trimming connection portion 5 is formed. That is, as shown in FIGS. 1 to 3, an insulating region 6 that defines the shape of the capacitance adjustment electrode 4 and the trimming connection portion 5 is formed around the capacitance adjustment electrode 4.

Such a dielectric laminated strip line resonator is formed using at least three green sheets made of a dielectric dielectric material that can be fired at a low temperature. For example, a conductive film serving as the internal line conductor 2 is formed on one main surface of the green sheet serving as the dielectric layer 1b by printing and drying an Ag-based or copper-based conductive paste.

On one open side of the internal line conductor 2 on one main surface of the green sheet serving as the dielectric layer 1a2, a conductive film serving as the high-capacity forming electrode 7 is formed of an Ag-based or copper-based conductive paste. It is formed by printing and drying.

Further, a through-hole is formed through the thickness of the green sheet on the open end side of the internal line conductor 2 of the green sheet serving as the dielectric layer 1a2, and a Ag-based or copper-based conductive paste is filled and dried. A conductor to be the via hole conductor 8 is formed.

Then, such three green sheets are laminated and integrated. Thereafter, a baking process is performed at a low temperature of 1050 ° or less to form a laminate having the internal line conductor 2, the high-capacity forming electrode 7, and the via-hole conductor 8 therein.

Thereafter, the outer conductor film 3 is formed on the outer peripheral surface of the laminated body excluding the open end surface by baking an Ag-based or copper-based material.

In forming the outer conductor film 3, a capacitance adjusting electrode 4 connected to the via-hole conductor 8 and a trimming connection portion 5 are formed on one main surface of the laminate 1.

Therefore, in the initial state, the high-capacity forming electrode 7 is connected to the outer conductor film 3 via the via-hole conductor 8, the capacitance adjusting electrode 4, and the trimming connection portion 5, and is actually at the ground potential.

The resonator having this structure differs from the internal line conductor 2 in the distance in the thickness direction to the outer conductor film 3 and the high-capacity forming electrode 7, and the gap between the high-capacity forming electrode 7 and the high-capacity forming electrode 7 is extremely low. Has become smaller. That is, although the potential of the capacitance distribution from the open end surface to the short-circuit end surface of the internal line conductor 2 is different, the capacitance component generated between the internal line conductor 2 and the high-capacity forming electrode 7 is different from that of the outer conductor film 3 having the same facing area. Is sufficiently large as compared with the capacitance component generated in the above.

When adjusting the resonance frequency of such a dielectric resonator (increasing the frequency), as described above,
The trimming connection portion 5 connecting the capacitance adjusting electrode 4 and the outer conductor film 3 is cut. Thus, not only the capacitance adjusting electrode 4 but also the via-hole conductor 8 and the high-capacity forming electrode 7 connected to the capacitance adjusting electrode 4 are electrically connected to the outer conductor film 3 at the same time to become a floating electrode. .

That is, in the initial state, there is no electrode in which the high-capacity forming electrode 7 is connected to the outer conductor film 3 to generate a large capacitance component, and the capacitance component on the open end side of the entire resonator decreases. As a result, the resonance frequency can be increased.

In the present embodiment, as described above, it is only necessary to cut so as to traverse the trimming connection portion 5 having a small width.
The high-capacity forming electrode 7 having generated a large capacity is replaced with the outer conductor film 3.
And the capacitance component can be made very small. This is compared with the adjustment of the capacitance component generated between the capacitance adjustment electrodes 4 and 41 to 49 formed on the same surface as the outer conductor film 3 as shown in FIGS. The adjustment width of the resonance frequency can be increased. That is, a very large resonance frequency can be adjusted by the trimming process in a very short time.

Further, since the starting point for performing laser irradiation such as trimming or sandblasting is present in the insulating region 6, the trimming can be performed relatively easily and with high reliability.

FIG. 10 shows a case where the dielectric resonator having the high capacitance forming electrode 7 shown in FIGS. 8 and 9 is applied to the capacitance adjusting electrodes 41 to 43 of FIG.

That is, in the internal line conductor 2, a very large capacitance component is generated at the high capacitance forming electrodes 71 to 73.

Then, the trimming connecting portions 51, 52, 5
By sequentially forming 3, a large capacitance component can be reduced and adjusted, and the resonance frequency can be adjusted in large steps.

For example, as shown in FIG. 11, in a dielectric electric resonator having an initial resonance frequency of 2.5 GHz, when trimming is not performed, the trimming connection portion 53 is cut to form a high-capacity forming electrode. When the opening 73 is opened, the trimming connection 52 is further cut off, and the electrodes 73 and 72 for high capacity formation are opened, and the trimming connection 51 is further cut off to form the electrode 73 for high capacity formation. , 72 and 71 were opened, the change of the resonance frequency was examined.

As can be understood from the characteristic diagram of FIG. 11, when the high capacity forming electrodes 71 to 73 are all connected and when the high capacity forming electrodes 71 to 73 are all open,
The resonance frequency becomes an adjustable range of 350 MHz, and the frequency can be adjusted stepwise within this 350 MHz.

When the predetermined frequency is between these stepwise frequencies, stepwise adjustment is performed by opening the high capacity forming electrodes 71 to 73 so as to be slightly lower than the predetermined frequency. A part of the outer conductor film 3 facing the inner line conductor 2 can be finely adjusted by scan trimming.

In FIG. 11, the high-capacity forming electrode 7
The reason why the frequency fluctuation rates in the open states 1 to 73 are slightly different is that the potential of the capacitance component decreases from the portion near the open end to the portion near the short-circuit end of the internal line conductor 2. In FIG. 11, assume that high capacity forming electrodes 71 to 7 are used.
In order to make the stepwise adjustment by the open state of 3 linear, the facing area between the high-capacity forming electrodes 71 to 73 and the internal line conductor 2 may be different. That is, the area of the high-capacity forming electrode 71 facing the internal line conductor 2 may be slightly smaller than the area of the high-capacity forming electrode 72 facing the internal line conductor 2.

FIG. 12 shows three capacitance adjusting electrodes 41 to 4.
3, two of the capacitance adjusting electrodes 441 and 42 are connected to the high-capacity forming electrodes 71 and via the via-hole conductors 81 and 82, respectively.
72, and one capacitance adjusting electrode 43 is
As shown in FIG. 5, the dielectric resonator faces the internal line conductor 2 via the dielectric layers 1a1 and 1a2.

That is, the amount of resonance frequency adjustment when trimming the trimming connection portions 51 and 52 and the capacitance adjusting electrode 43 are set to the open state so that the high capacity forming electrodes 71 and 72 are set to the open state. This is different from the adjustment amount of the resonance frequency when the trimming connection unit 53 performs the trimming process. That is, the adjustment amount when the capacitance adjustment electrode 43 is in the open state is small.

Accordingly, a trimming process for opening the high-capacity forming electrodes 71 and 72, a trimming process for opening the capacitance-adjusting electrode 43, and an outer conductor film in a region facing the internal line conductor 2. 3 can be very quickly and accurately adjusted from the initial resonance frequency to the predetermined resonance frequency by arbitrarily combining with the process of scanning trimming.

If the line width that can be removed by laser irradiation in one scan is 0.1 mm, if a slot area of 0.5 mm × 1.0 mm is formed as in the prior art, the scanning distance is 1.0 mm. Must be scanned 5 times. If one scan requires 0.1 second, the slot processing requires 0.5 second processing time.

In the structure of the dielectric resonator shown in FIG. 1, when the outer peripheral shape of the insulating region 6 is 0.5 mm × 1.0 mm, a scan of 3.0 mm is required to cut the four trimming connection portions 5. And the time required for this is 0.3 seconds.

Further, one capacitance adjusting electrode 41-49
Is adjusted by the trimming process of one of the trimming connection portions 51 to 59, the adjustment is completed in the time required to cut only the trimming connection portion having a small width. For example, trimming connection portions 51 to 5 having a small width
If the width of 9 is 0.2 mm, the time required for the trimming process is 0.02 seconds, and the frequency adjustment process time can be drastically reduced.

In the above embodiment, the dielectric layers 1a, 1a
b, 1a1, 1a2, and 1b are used.
a and 1b themselves may be formed by a plurality of dielectric layers by a capacitance component between the inner line conductor 2 and the outer conductor film 3 (the capacitance adjusting electrode 4 and the high capacitance forming electrode 7).

In the above embodiment, three capacitance adjusting electrodes are formed. However, the area of the capacitance adjusting electrode and the high capacitance forming electrode facing the internal line conductor is reduced, and three or more electrodes are formed. The electrode for adjusting the capacitance and the electrode for forming the high capacitance may be formed to reduce the step difference of the resonance frequency adjustment.

In the above embodiment, the outer conductor film 3 is
It is formed on all outer surfaces except the open end surface of the laminate 1. However, if a via-hole conductor is formed on the short-circuit end side of the internal line conductor 2 and the outer conductor film 3 formed on both main surfaces of the laminate 1, the outer conductor film on the short-circuit end face side of the laminate 1 becomes unnecessary. . Furthermore, compared to the width of the internal line conductor 2, the laminate 1
Is large, the outer conductor films on the two side surfaces of the laminate 1 are not required. That is, the outer conductor film 3 only needs to be formed on at least both main surfaces of the laminate.

Further, in the above description of the embodiment, the dielectric resonant component is described using the dielectric laminated strip line resonator. However, a plurality of internal line conductors are formed and capacitively or inductively coupled to each other. Alternatively, a dielectric laminated strip line filter may be used. At this time, since the filter characteristics are substantially dependent on the resonance frequency of the resonance unit constituting the filter, the structure for adjusting the resonance frequency as in the present invention is useful.

[0089]

As described above, according to the present invention, a capacitance adjusting electrode is formed on a part of the outer conductor film. This capacitance adjusting electrode faces the internal line conductor. Alternatively, the capacitance adjusting electrode is connected to a high capacitance forming electrode facing the internal line conductor. In each of the structures, a narrow trimming connecting portion for connecting the capacitance adjusting electrode and the outer conductor film is formed.

Therefore, when adjusting the resonance frequency, the capacitance adjusting electrode or the high-capacity forming electrode can be opened only by cutting the narrow trimming connection portion at a short distance. It can be adjusted step by step.

Accordingly, the dielectric resonance component can adjust the resonance frequency in a wide range stepwise in a short time in the trimming process.

[Brief description of the drawings]

FIG. 1 is a plan view of a dielectric laminated strip line resonator as an example of a dielectric resonant component of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is an exploded perspective view of the dielectric laminated strip line resonator shown in FIG.

FIG. 4 is a plan view of a capacitance adjusting electrode portion of the dielectric laminated strip line resonator shown in FIG. 1;

FIG. 5 is a plan view of a capacitance adjusting electrode portion according to a second embodiment of the present invention.

FIG. 6 is a plan view of a capacitance adjusting electrode portion according to a third embodiment of the present invention.

FIG. 7 is a plan view of a capacitance adjusting electrode portion according to a fourth embodiment of the present invention.

8 (a) is a plan view and FIG. 8 (b) is another dielectric laminated strip line resonator according to the present invention.
FIG. 8A is a sectional view taken along the line BB in FIG. 8A, and FIG.
It is a CC sectional view taken on the line.

FIG. 9 is an exploded perspective view of another dielectric laminated strip line resonator of the present invention.

FIG. 10 is a dielectric laminated strip line resonator showing another embodiment of the present invention, wherein (a) is a plan view,
FIG. 11B is a sectional view taken along line DD in FIG.

11 is a characteristic diagram showing a change in resonance frequency due to an open state of a high-capacity forming electrode of the dielectric laminated strip line resonator shown in FIG.

12A and 12B show a dielectric laminated strip line resonator according to still another embodiment of the present invention, wherein FIG. 12A is a plan view, and FIG. 12B is a cross-sectional view taken along line EE in FIG. FIG.

[Description of Signs] 1 ... laminated body 2 ... inner line conductor 3 ... outer conductor film 4, 41 to 49 ... capacitance adjusting electrode 5, 51 to 59 ... trimming connection part 6. ..Insulating regions 7, 71 to 73 ··· High-capacity forming electrodes 8, 81 to 83 ··· Via-hole conductors

Claims (3)

[Claims] 1. An internal line conductor is disposed between layers of a laminate formed by laminating a plurality of dielectric ceramic layers, an outer conductor film is disposed on at least both main surfaces of the laminate, and one end of the internal line conductor is provided. And a capacitance adjusting electrode connected to the outer conductor film by a narrow trimming connection portion on one main surface of the laminate. Dielectric resonance parts. 2. A connection between the capacitance adjusting electrode and an internal line conductor in the laminate via a capacitance adjusting electrode portion and a via hole conductor, and is opposed to the internal line conductor via a dielectric layer. 2. The dielectric resonance component according to claim 1, wherein an electrode for forming a high capacitance is arranged. 3. The dielectric resonance component according to claim 1, wherein a plurality of said capacitance adjusting electrode portions are connected via a trimming connection portion.