JP2003101307A - Laminated strip line filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated strip line filter which is reduced in filter characteristic variations caused by the misaligned lamination of dielectric layers. SOLUTION: A first and a second one-side open rectangular resonance electrodes, 32 and 36, which are each as wide as W1 and arranged so as to overlap nearly with one another in the direction of lamination are electrically connected together through the intermediary of connecting conductors 38 arranged at an interval 1/8 or below as long as the wavelength of a center frequency, and the width W1 and the width W2 of a third one-side open rectangular resonance electrode 34 are so set as to satisfy a formula, W1<W2. The third one-side open rectangular resonance electrode 34 is arranged so as to cover the first and the second one-side open rectangular resonance electrodes, 32 and 36, in the direction of lamination, the width W3 of a first one-side short- circuit rectangular resonance electrode 33 and the width W4 of a second one-side short-circuit rectangular resonance electrode 35 are so set as to satisfy a formula, W3<W4, and the second one-side short-circuit rectangular resonance electrode 35 is arranged so as to cover the first one-side short-circuited rectangular resonance electrode 33 in the direction of lamination for the formation of a laminated strip line filter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated stripline filter used in, for example, a wireless communication device such as a mobile phone or a wireless LAN and various other communication devices.

[0002]

2. Description of the Related Art In recent years, filters used in mobile communication devices such as mobile phones have become thinner and thinner.
Along with the demand for miniaturization, a filter using a dielectric coaxial resonator has been developed to a laminated stripline filter using a distributed constant circuit as a resonator.

As such a conventional laminated stripline filter, Japanese Patent Application Laid-Open No. 9-331201 proposes a structure shown in a perspective view in FIG. 9 and a perspective plan view in FIG.

In FIGS. 9 and 10, 10 is a first dielectric layer, 11 is a second dielectric layer laminated on the first dielectric layer 10, and 12 is a second dielectric layer 11. A third dielectric layer stacked on top of the first dielectric layer, 13 is a first dielectric layer disposed on the lower surface of the first dielectric layer 10.
Ground electrode, 14 is a second ground electrode disposed on the upper surface of the third dielectric layer 12, and 15 and 16 are first ground electrodes disposed between the first dielectric layer 10 and the second dielectric layer 11. One open-ended rectangular resonant electrode and first short-ended rectangular resonant electrode, 17 and 18
Are a second one-end open rectangular resonance electrode and a second one-end short-circuited rectangular resonance electrode arranged between the second dielectric layer 11 and the third dielectric layer 12.

First and second open-ended rectangular resonant electrodes
The reference numerals 15 and 17 have substantially the same shape, are parallel to each other when viewed from the stacking direction, and are part of the first rectangular resonant electrode 15 with one open end and the second resonant electrode 15.
A part of the rectangular resonance electrode 17 having one open end and a second dielectric layer
They are arranged so as to overlap each other with 11 in between.

The first and second one-sided short-circuited rectangular resonance electrodes 16 and 18 have substantially the same shape, are parallel to each other when viewed from the stacking direction, and are one of the first one-sided short-circuited rectangular resonance electrodes 16. And a part of the second one-side short-circuited rectangular resonance electrode 18 are arranged so as to overlap each other with the second dielectric layer 11 in between.

Furthermore, the first one end open rectangular resonance electrode 15
Of the first one-sided short-circuited rectangular resonance electrode 16 is electrically connected to the end of the first one-sided short-circuited rectangular resonance electrode 16 opposite to the short-circuited end 20, and the second one-sided open rectangular resonance electrode 17 And the end opposite to the open end 19 of the second short-circuited end of the second short-circuited rectangular resonance electrode 18
It was configured to electrically connect 20 and the opposite end. Note that the illustration of the first and second ground electrodes 13 and 14 is omitted in FIG.

The width W1 of the first and second one-sided open rectangular resonance electrodes 15 and 17, the width W2 of the first and second one-sided short-circuited rectangular resonance electrodes 16 and 18, the first one-sided open rectangular shape The width W3 at which the resonance electrode 15 and the second one-end open rectangular resonance electrode 17 overlap each other with the second dielectric layer 11 in between, and the first width
By adjusting the width W4 at which the one-sided short-circuited rectangular resonance electrode 16 and the second one-sided short-circuited rectangular resonance electrode 18 overlap each other with the second dielectric layer 11 sandwiched therebetween, the first and second one-side open rectangular shapes are formed. When the capacitive coupling is dominant as the coupling formed between the shape resonant electrodes 15 and 17 and between the first and second short-circuited rectangular resonant electrodes 16 and 18, the lower side of the pass band is set. On the contrary, when the inductive coupling is dominant, the filter characteristic having one attenuation pole is realized, and the filter characteristic having one attenuation pole on the high frequency side of the pass band is realized.

[0009]

However, in such a conventional laminated stripline filter as described above,
The first one-end open rectangular resonance electrode is caused by a stacking error that occurs in the process of stacking the first to third dielectric layers 10 to 12.
Width W3 in which 15 and the second one-end open rectangular resonance electrode 17 overlap each other with the second dielectric layer 11 in between, and the first one-end short-circuit rectangular resonance electrode 16 and the second one-end short-circuit rectangular resonance electrode
The width W4 of 18 and 18 overlapping each other with the second dielectric layer 11 in between is changed, whereby the electromagnetic field coupling amount between the first and second open-ended rectangular resonant electrodes 15 and 17, and the first and second electromagnetic resonance coupling electrodes. There is a problem in that the electromagnetic field coupling amount between the one-side short-circuited rectangular resonance electrodes 16 and 18 changes, and thus the center frequency and the attenuation pole greatly change with respect to the desired filter characteristics.

The present invention has been devised in view of the above problems, and an object thereof is to reduce fluctuations in the center frequency and attenuation pole of the filter characteristics due to stacking deviations that occur in the process of stacking a plurality of dielectric layers. It is to provide a laminated stripline filter that can be reduced.

[0011]

A first laminated stripline filter according to the present invention comprises a first dielectric layer and the first dielectric layer.
A second dielectric layer laminated on the second dielectric layer, a third dielectric layer laminated on the second dielectric layer, and a third dielectric layer laminated on the third dielectric layer. A fourth dielectric layer, and a first ground electrode arranged on the lower surface of the first dielectric layer,
A second ground electrode disposed on the upper surface of the fourth dielectric layer, and a first ground electrode disposed between the first and second dielectric layers.
The one-sided open rectangular resonance electrode and the first one-sided short-circuited rectangular resonance electrode, the second one-sided open rectangular resonance electrode disposed between the second and third dielectric layers, and the third and It is composed of a third one-end open rectangular resonance electrode and a second one-end short-circuited rectangular resonance electrode arranged between the fourth dielectric layers, and the thickness h1 of the first dielectric layer is the fourth one. H1 <h2 with respect to the thickness h2 of the dielectric layer, and the first and second open-ended rectangular resonance electrodes have substantially the same width W.
1, the width W2 of the third one-end open rectangular resonance electrode is W1 <W2 with respect to the width W1, and the first to third one-end open rectangular resonance electrodes have substantially the same length. Having a height, parallel to each other when viewed from the stacking direction, and the first and second
And the third open-ended rectangular resonant electrode is arranged to cover the first and second open-ended rectangular resonant electrodes, and the first open-ended rectangular resonant electrode The short-circuited rectangular resonance electrode is electrically connected to the first or second ground electrode via a ground connection conductor on the short-circuit side, and the width W3 of the first one-end short-circuited rectangular resonance electrode is the second one. Width W4 of one end short-circuited rectangular resonance electrode
With respect to W3 <W4, and further, the first and second
The one-side short-circuited rectangular resonance electrodes have substantially the same length, are parallel to each other when viewed from the stacking direction, and the second one-side short-circuited rectangular resonance electrode covers the first one-side short-circuited rectangular resonance electrode. And the first and second ground electrodes are
A third one-end open rectangular resonance electrode and the first and second one-end short-circuited rectangular resonance electrodes are arranged to cover the first one-end open rectangular resonance electrode and an end opposite to the open end. The first short-circuited rectangular resonance electrode and the opposite end of the first short-circuited rectangular resonance electrode are electrically connected, and the third single-ended open rectangular resonance electrode has an end opposite to the open end, and The short-circuited end and the opposite end of the second short-circuited rectangular resonant electrode are electrically connected, and the first open-ended rectangular resonant electrode and the second open-ended rectangular resonant electrode are connected to each other. Are electrically connected via connection conductors arranged at intervals of ⅛ or less of the wavelength of the center frequency.

According to the first laminated stripline filter of the present invention, the first and second open-ended rectangular resonant electrodes having substantially the same width W1 and arranged so as to substantially overlap each other when viewed from the laminating direction. Is an electrically connected one-end open rectangular resonance electrode that is electrically connected via connection conductors arranged at intervals of ⅛ or less of the wavelength of the center frequency, and with respect to this width W1, The width W2 of the third open-ended rectangular resonant electrode is W1 <W2, and the third open-ended rectangular resonant electrode covers the first and second open-ended rectangular resonant electrodes when viewed from the stacking direction. The width W3 of the first one-sided short-circuited rectangular resonance electrode is W3 <W4 with respect to the width W4 of the second one-sided short-circuited rectangular resonance electrode, and the second one-side short-circuited when viewed from the stacking direction. The rectangular resonant electrode is the first short-circuited rectangular resonant electrode. Since it is arranged so as to cover,
Even when a stacking error occurs in the process of stacking a plurality of dielectric layers, the integrated first and second open-ended rectangular resonance electrodes and the third open-ended rectangular resonant electrode are formed due to the stacking error. It is possible to reduce the change in the amount of electromagnetic field coupling between the two and the change in the amount of electromagnetic field coupling between the first and second one-side short-circuited rectangular resonance electrodes, which reduces the center frequency of the filter characteristic and the attenuation pole. Fluctuations can be reduced.

Further, according to the first laminated stripline filter of the present invention, the interval between the integrated first and second one-end open rectangular resonance electrodes and the third one-end open rectangular resonance electrodes is set to the first. Since the gap is formed narrower than the space between the first and the second one-side short-circuited rectangular resonance electrodes, capacitive coupling becomes dominant, and a filter characteristic having one attenuation pole on the low frequency side of the pass band is realized. You can

In the first laminated stripline filter of the present invention, in the above structure, the ground connection conductor and the connection conductor are formed on a through conductor and / or a side surface formed inside the dielectric layer. It is characterized by being a terminal electrode.

As a result, the degree of freedom in designing the laminated stripline filter formed inside the plurality of laminated dielectric layers is improved, and a compact and high-performance laminated stripline can be provided.

A second laminated stripline filter of the present invention comprises a first dielectric layer, a second dielectric layer laminated on the first dielectric layer, and the second dielectric layer. A third dielectric layer stacked on the first dielectric layer, a fourth dielectric layer stacked on the third dielectric layer, a fourth dielectric layer stacked on the third dielectric layer, and a fourth dielectric layer stacked on the lower surface of the first dielectric layer. One ground electrode, a second ground electrode arranged on the upper surface of the fourth dielectric layer, and a first one-end open rectangular resonance arranged between the first and second dielectric layers. An electrode and a first single-ended short-circuited rectangular resonance electrode, a second single-ended short-circuited rectangular resonance electrode arranged between the second and third dielectric layers, and the third and fourth dielectric layers A second one-end open rectangular resonance electrode and a third one-end short-circuited rectangular resonance electrode arranged between the first and second dielectric layers. Fourth h to thickness h2 of the dielectric layer
1 <h2 and the width W1 of the first open-ended rectangular resonant electrode is W1 <W2 with respect to the width W2 of the open second open-ended rectangular resonant electrode, and the first and second open ends The open rectangular resonance electrodes have substantially the same length and are arranged in parallel when viewed from the stacking direction, and the second one-end open rectangular resonance electrode is arranged so as to cover the first one-end open rectangular resonance electrode. The first to third one-side short-circuited rectangular resonance electrodes are respectively connected to the first through the ground connection conductor on the short-circuit side.
Alternatively, the first and second one-sided short-circuited rectangular resonance electrodes are electrically connected to the second ground electrode, and the first and second one-sided short-circuited rectangular resonance electrodes have substantially the same width W3. W3 <W4 with respect to the width W4 of
The third one-end short-circuited rectangular resonance electrode has substantially the same length,
The first and second single-ended short-circuited rectangular resonant electrodes are substantially parallel to each other when viewed in the stacking direction, and the third single-ended short-circuited rectangular resonant electrode is overlapped with the first and second single-ended short-circuited rectangular resonant electrodes. And the first and second ground electrodes are arranged so as to cover the first and second one-end open rectangular resonance electrodes and the first to third one-end short-circuited rectangular resonance electrodes. An end of the first open-ended rectangular resonant electrode opposite to the open end and an end of the first open-ended rectangular resonant electrode opposite to the open end are electrically connected, The end of the second one-end open rectangular resonance electrode opposite to the open end and the end of the third one-end short-circuit rectangular resonance electrode opposite to the short-end are electrically connected, and The first one-end short-circuited rectangular resonance electrode and the second one-end short-circuited rectangular resonance electrode. 1 door is of the wavelength of the center frequency of 8 minutes
It is characterized in that they are electrically connected via connection conductors arranged at the following intervals.

According to the second laminated stripline filter of the present invention, the width W1 of the first one-end open rectangular resonance electrode is set.
Is W1 <with respect to the width W2 of the second rectangular electrode with one open end.
W2, and the second one-end open rectangular resonance electrode is arranged so as to cover the first one-end open rectangular resonance electrode when viewed from the stacking direction, has substantially the same width W3, and is viewed from the stacking direction. The first and the second one-end short-circuited rectangular resonance electrodes, which are arranged so as to be substantially overlapped with each other, are electrically connected to each other through connection conductors arranged at intervals of ⅛ or less of the wavelength of the center frequency to be integrated. A rectangular resonant electrode with a short-circuited one end
With respect to this width W3, the width W4 of the third one-sided short-circuited rectangular resonance electrode is W3 <W4, and the third one-sided short-circuited rectangular resonance electrode is seen from the stacking direction. Since the shape resonance electrodes are disposed so as to cover the shape resonance electrodes, even when a stacking error occurs in the process of stacking a plurality of dielectric layers, the first and the second one-end open rectangular resonance electrodes are separated by the stacking error. And a change in the amount of electromagnetic field coupling between the integrated first and second single-ended short-circuited rectangular resonant electrodes and the third single-ended short-circuited rectangular resonant electrode. Therefore, the center frequency of the filter characteristic and the variation of the attenuation pole can be reduced.

Further, according to the second laminated stripline filter of the present invention, the first and second single-ended short-circuited rectangular resonances in which the intervals between the first and second open-ended rectangular resonance electrodes are integrated. Since it is formed wider than the distance between the electrode and the third one-side short-circuited rectangular resonance electrode, inductive coupling becomes dominant, and a filter characteristic having one attenuation pole on the high frequency side of the pass band is realized. be able to.

In the second laminated stripline filter according to the present invention, the ground connection conductor and the connection conductor are formed on the through conductor and / or the side surface formed inside the dielectric layer. It is characterized by being a terminal electrode.

As a result, the degree of freedom in designing the laminated stripline filter formed inside the plurality of laminated dielectric layers is improved, and a compact and high-performance laminated stripline can be provided.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A laminated stripline filter of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an example of an embodiment of a first laminated stripline filter of the present invention, and FIG. 2 is a perspective plan view of FIG. 1 seen from the laminating direction.
1 and 2, 21 is a first dielectric layer, 22 is a second dielectric layer laminated on the first dielectric layer 21, and 23 is a second dielectric layer 22. Stacked third dielectric layer, 24
Is a fourth dielectric layer laminated on the third dielectric layer 23,
Reference numeral 30 is a first ground electrode provided on the lower surface of the first dielectric layer 21, 31 is a second ground electrode provided on the upper surface of the fourth dielectric layer 24, and 32 and 33 are first and second electrodes, respectively. Second dielectric layer
The first one-end open rectangular resonance electrode and the first one-end short-circuited rectangular resonance electrode, which are arranged between 21 and 22, 36 is the second and third
Second open-ended rectangular resonant electrode disposed between the dielectric layers 22 and 23, and 34 and 35 are third open-ended rectangular electrodes disposed between the third and fourth dielectric layers 23 and 24, respectively. The rectangular resonance electrode and the second short-circuited rectangular resonance electrode, 38 is a connection conductor,
39 is an open end and 40 is a short-circuited end. In FIG. 2, the first
Illustration of the second ground electrodes 30 and 31 is omitted.

Then, as shown in FIGS. 1 and 2, the thickness h1 of the first dielectric layer 21 is equal to the thickness h of the fourth dielectric layer 24.
For 2, h1 <h2. In addition, the first and second ground electrodes 30 and 31 are the first to third one-end open rectangular resonance electrodes 32.
36.34 and the first and second short-circuited rectangular resonance electrodes 33,35 are arranged so as to cover them.

Further, as shown in FIG. 2, the first and second
The rectangular resonant electrodes 32 and 36 having one open end have substantially the same width W1, and the third rectangular open resonant electrode 34 having one open end with respect to this width W1.
Has a width W2 of W1 <W2, and the first to third open-ended rectangular resonance electrodes 32, 36, 34 have substantially the same length L1 and are parallel to each other when viewed in the stacking direction. The first and second open-ended rectangular resonant electrodes 32, 36 are substantially overlapped with each other, and the third open-ended rectangular resonant electrode 34 is arranged so as to cover the first and second open-ended rectangular resonant electrodes 32, 36. ing.
In addition, the first and second short-circuited rectangular resonance electrodes 33, 35
Are electrically connected to the first or second ground electrodes 30 and 31 via ground connection conductors (not shown) at short-circuited ends 40, respectively, and the width W3 of the first one-end short-circuited rectangular resonance electrode 33 is the first. W3 <W4 with respect to the width W4 of the two one-sided short-circuited rectangular resonance electrodes 35, and the first and second one-sided short-circuited rectangular resonance electrodes 33 and 35 have substantially the same length L2 and are arranged in the stacking direction. The second one-end short-circuited rectangular resonance electrode 35 is arranged so as to be parallel to each other so as to cover the first one-end short-circuited rectangular resonance electrode 33.
Then, the end portion of the first one-end open rectangular resonance electrode 32 opposite to the open end 39 and the end portion of the first one-end short-circuit rectangular resonance electrode 33 opposite to the short-circuit end 40 are electrically connected. And an end portion of the third one-end open rectangular resonance electrode 34 opposite to the open end 39,
The second short-circuited rectangular resonance electrode 35 is electrically connected to the short-circuited end 40 and the opposite end. Further, the first one-end open rectangular resonance electrode 32 and the second one-end open rectangular resonance electrode 36 are electrically connected via a connection conductor 38 arranged at an interval of ⅛ or less of the wavelength of the center frequency. Connected to each other. In this example, a through conductor is used as the connecting conductor 38.

The first laminated stripline filter of the present invention having the above-mentioned structure is provided with a ground connecting conductor and a connecting conductor.
A through conductor formed inside the dielectric layer as 38 and /
Alternatively, by using the terminal electrodes formed on the side surface, the design flexibility of the laminated stripline filter formed inside the plurality of laminated dielectric layers is improved, and the compact and high-performance laminated stripline is provided. Can be provided.

In forming the first laminated stripline filter of the present invention, the first to fourth dielectric layers 21 to 2 are formed.
4, first and second ground electrodes 30, 31, first to third one-side open rectangular resonance electrodes 32, 36, 34, first and second one-side short-circuited rectangular resonance electrodes 33, 35, connection conductor 38 can be made of various materials and forms used for a well-known high-frequency wiring board.

The first to fourth dielectric layers 21 to 24 used in the first laminated stripline filter of the present invention include, for example, ceramic materials such as alumina ceramics and mullite ceramics, inorganic materials such as glass ceramics, or the like. Tetrafluoroethylene resin (polytetrafluoroethylene; PTFE) / tetrafluoroethylene-ethylene copolymer resin (tetrafluoroethylene-ethylene copolymer resin; ETFE) / tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin (tetra Fluoroethylene-perfluteroalkyl vinyl ether copolymer resin; P
Fluororesin such as FA) or resin-based material such as glass epoxy resin or polyimide is used. The shapes and dimensions (thickness, width, etc.) of the first to fourth dielectric layers 21 to 24 made of these materials
The length) is set according to the frequency used and the purpose of use.

The first and second ground electrodes 30, 31 in the first laminated stripline filter of the present invention
The third one-side open rectangular resonance electrodes 32, 36, 34, the first and second one-end short-circuited rectangular resonance electrodes 33, 35, and the connecting conductor 38 are
Conductor layer of metal material for high frequency signal transmission, eg Cu layer
Ni plating layer and Au on the metallized layer of Mo-Mn
The one with the plating layer deposited on the metallization layer of W Ni
Plating layer and Au plating layer deposited ・ Cr-
Cu alloy layer-Cr-Cu alloy layer with Ni plating layer and Au plating layer deposited-Ta ₂ N layer with Ni-
Cr alloy layer and Au plating layer deposited on Ti
A thick film printing method or formation of various thin films by using a layer in which a Pt layer and an Au plating layer are deposited, or a layer in which a Pt layer and an Au plating layer are deposited on a Ni—Cr alloy layer It is formed by a method or a plating method. The thickness and width thereof are also set according to the frequency of the high frequency signal to be transmitted, the application, and the like.

When the first to fourth dielectric layers 21 to 24 used in the first laminated stripline filter of the present invention are manufactured, for example, when the dielectric layers are made of glass ceramics, the dielectric layers are first prepared. A green sheet of glass-ceramics to be prepared is prepared, and a predetermined punching process is performed on the green sheet to form a through hole to be a through conductor. Then, a conductor paste such as Cu is filled in the through hole by a screen printing method, and Print and apply transmission line patterns and other conductor layer patterns. Next, firing is performed at 850 to 1000 ° C, and finally, Ni plating and A
Apply u plating.

The materials and forming method of the first laminated stripline filter of the present invention are the same as those of the second laminated stripline filter of the present invention described later.

FIG. 3 shows a first laminated stripline filter of the present invention having the structure shown in FIGS. 1 and 2, and FIG.
11 is an example of filter characteristics obtained when capacitive coupling is dominant in the conventional laminated stripline filter shown in FIG. In FIG. 3, the horizontal axis represents frequency (unit: GHz) and the vertical axis represents insertion loss (unit: dB).
, F0 is the center frequency, BW is the pass band, and fr is the attenuation pole. The filter characteristic shown in FIG. 3 has a pass band BW.
One of the characteristics is that one attenuation pole fr is formed on the low frequency side.

FIGS. 4 and 5 show a three-dimensional electromagnetic model of the structural model of the first laminated stripline filter of the present invention having the structure shown in FIGS. 1 and 2 and the conventional laminated stripline filter shown in FIGS. 9 and 10. It is each line diagram which shows the example of the variation | change_quantity of the center frequency f0 and the attenuation pole fr in the simulation result in case the +100 μm is considered as the stacking deviation amount in the width direction, which is created by the field analysis simulator.

This simulation is shown in FIG. 1 and FIG.
, H1 = 0.03 mm, h2 = 0.13 mm, h3 = 0.
05mm, h4 = 0.06mm, W1 = 0.29mm, W2 = 0.91
mm, W3 = 0.37 mm, W4 = 1.06 mm, L1 = L2 =
4.9 mm, and considering ± 100 μm as the amount of stacking deviation in the width direction, and in FIGS. 9 and 10, h1
= H2 = h3 = 0.1mm, W1 = 0.91mm, W2 = 0.96
mm, W3 = 0.53 mm, W4 = 0.25 mm, L1 = L2 =
A study was carried out in the case of 4.9 mm and ± 100 μm as the amount of stacking deviation in the width direction. The relative permittivity of each dielectric layer used in the simulation was set to 9.5. The calculation results obtained by simulation agree well with the measured values.

In FIG. 4, the horizontal axis represents the amount of stacking deviation in the width direction (unit: μm), and the vertical axis represents the amount of change in the center frequency f0 (unit: MHz). First
B shows the result in the laminated stripline filter of FIG. 9, and B shows the result in the conventional laminated stripline filter shown in FIGS. 9 and 10.

In FIG. 5, the horizontal axis represents the amount of stacking deviation in the width direction (unit: μm), and the vertical axis represents the amount of change in the attenuation pole fr (unit: MHz). The results in the first laminated stripline filter of the invention are:
B shows the result in the conventional laminated stripline filter shown in FIG. 9 and FIG.

As is clear from the results shown in FIGS. 4 and 5, according to the first laminated stripline filter of the present invention, the filter characteristics of the filter characteristics are different due to the stacking deviation occurring in the step of stacking a plurality of dielectric layers. It is possible to reduce variations in the center frequency and the attenuation pole.

For example, regarding the amount of change in the center frequency and the amount of change in the attenuation pole at a stacking deviation of -100 μm, A ... Change in the center frequency: -6 MHz, Change in the attenuation pole: -5 MHz B. The change amount is −17 MHz and the change amount of the attenuation pole is −90 MHz. Compared with the result (B) in the conventional laminated stripline filter, the result (A) in the first laminated stripline filter of the present invention is mainly It can be seen that the amount of change in frequency and the amount of change in attenuation pole can be reduced.

Next, an example of an embodiment of the second laminated stripline filter of the present invention will be described with reference to the drawings.

FIG. 6 is a perspective view similar to FIG. 1 showing an example of an embodiment of a second laminated stripline filter of the present invention, and FIG. 7 is similar to FIG. 2 when FIG. 6 is seen from the laminating direction. It is a perspective plan view of FIG. In FIGS. 6 and 7, 41 is a first dielectric layer, 42 is a second dielectric layer laminated on the first dielectric layer 41, and 43 is a second dielectric layer 42. The laminated third dielectric layer, 44 is the fourth dielectric layer laminated on the third dielectric layer 43, and 50 is the first dielectric layer arranged on the lower surface of the first dielectric layer 41. A ground electrode, 51 is a second ground electrode disposed on the upper surface of the fourth dielectric layer 44, and 52 and 53 are first electrodes, respectively.
And a first one-end open rectangular resonance electrode and a first one-end short-circuited rectangular resonance electrode, which are arranged between the second dielectric layers 41 and 42, and 57 is the second and third dielectric layers 42 and 43. A second short-circuited rectangular resonant electrode disposed between the first and second short-circuited electrodes, 54 and 55 being a second resonant electrode disposed between the third and fourth dielectric layers 43 and 44, respectively.
The one-end open rectangular resonance electrode and the third one-end short-circuited rectangular resonance electrode, 58 is a connecting conductor, 59 is an open end, and 60 is a short-circuit end. Also in FIG. 7, the first and second ground electrodes 50 and 51 are also provided.
Are not shown.

Then, as shown in FIGS. 6 and 7, the thickness h1 of the first dielectric layer 41 is equal to the thickness h of the fourth dielectric layer 44.
2, h1 <h2, and the first and second ground electrodes 50 and 51 are the first and second one-end open rectangular resonance electrodes 52 and 54 and the first to third one-end short-circuited rectangular resonances. electrode
It is arranged to cover 53, 57 and 55.

As shown in FIG. 7, the width W1 of the first one-end open rectangular resonance electrode 52 is W1 <W2 with respect to the width W2 of the second one-end open rectangular resonance electrode 54. 1
The second one-end open rectangular resonance electrodes 52 and 54 have substantially the same length L1, are parallel to each other when viewed from the stacking direction, and the second one-end open rectangular resonance electrode 54 is the first one-end open rectangle. It is arranged so as to cover the shape resonance electrode 52. The first to third one-side short-circuited rectangular resonance electrodes 53, 57, 55 are electrically connected to the first or second ground electrode 50, 51 at the short-circuit end 60 via a ground connection conductor (not shown). , And the first and second short-circuited rectangular resonance electrodes 53 and 57 have substantially the same width W3, with respect to this width W3, the third short-circuited rectangular resonance electrode 55.
Has a width W4 of W3 <W4, and the first to third single-ended short-circuited rectangular resonance electrodes 53, 57, 55 have substantially the same length L2, and are parallel to each other when viewed from the stacking direction, and The first and second one-sided short-circuited rectangular resonance electrodes 53 and 57 are substantially overlapped with each other, and the third one-sided short-circuited rectangular resonance electrode 55 is arranged to cover the first and second one-sided short-circuited rectangular resonance electrodes 53 and 57. ing.
Then, the end portion of the first one-end open rectangular resonance electrode 52 opposite to the open end 59 and the end portion of the first one-end short-circuit rectangular resonance electrode 53 opposite to the short-circuit end 60 are electrically connected. And an end portion of the second one-end open rectangular resonance electrode 54 opposite to the open end 59,
The short-circuit end 60 of the third one-end short-circuited rectangular resonance electrode 55 and the end on the opposite side are electrically connected. Further, the first one-end short-circuited rectangular resonance electrode 53 and the second one-end short-circuited rectangular resonance electrode 57 are electrically connected via a connecting conductor 58 arranged at an interval of ⅛ or less of the wavelength of the center frequency. Connected to each other. In this example, a through conductor is used as the connecting conductor 58.

The second laminated stripline filter of the present invention having such a structure is provided with a ground connecting conductor and a connecting conductor.
A through conductor formed inside the dielectric layer as 58 and /
Alternatively, by using the terminal electrodes formed on the side surface, the design flexibility of the laminated stripline filter formed inside the plurality of laminated dielectric layers is improved, and the compact and high-performance laminated stripline is provided. Can be provided.

FIG. 8 shows a second laminated stripline filter of the present invention having the structure shown in FIGS. 6 and 7, and FIG.
11 is an example of filter characteristics obtained when inductive coupling is dominant in the conventional laminated stripline filter shown in FIG. In FIG. 7, the horizontal axis represents frequency (unit: GHz) and the vertical axis represents insertion loss (unit: dB).
, F0 is the center frequency, BW is the pass band, and fr is the attenuation pole. The filter characteristic shown in FIG. 8 has a pass band BW.
Is characterized in that one attenuation pole fr is formed on the high frequency side.

The second aspect of the present invention having the structure shown in FIGS. 6 and 7.
The laminated stripline filter of No. 1 has the function and effect described in the first laminated stripline filter of the present invention having the configuration shown in FIG. 1 and FIG. It is possible to reduce the fluctuation of the center frequency of the filter characteristic and the attenuation pole, as it has the same effect as.

The present invention is not limited to the above-described embodiments, and various modifications and improvements may be added without departing from the scope of the present invention.

[0046]

According to the first laminated stripline filter of the present invention, the first and second open-ended rectangular shapes having substantially the same width W1 and arranged so as to substantially overlap each other when viewed from the laminating direction are provided. The resonance electrodes are electrically connected via the connection conductors arranged at intervals of ⅛ or less of the wavelength of the center frequency to form an integrated one-end open rectangular resonance electrode, and the width W1 is set to this width W1. On the other hand, the width W2 of the third open-ended rectangular resonant electrode is W1 <W2, and the third open-ended rectangular resonant electrode is the first and second open-ended rectangular resonant electrodes when viewed from the stacking direction. And the width W3 of the first one-sided short-circuited rectangular resonance electrode is W3 <W4 with respect to the width W4 of the second one-sided short-circuited rectangular resonance electrode, and the width W3 is smaller than that of the second one-side short-circuited rectangular resonance electrode when viewed from the stacking direction. The one-side short-circuited rectangular resonance electrode is connected to the first one-side short-circuited rectangular resonance electrode. Therefore, even when a stacking error occurs in the process of stacking a plurality of dielectric layers, the integrated first and second open-ended rectangular resonant electrodes due to the stacking error are formed. It is possible to reduce the change in the amount of electromagnetic field coupling between the first and second one-side open rectangular resonance electrodes and the change in the amount of electromagnetic field coupling between the first and second short-sided rectangular resonance electrodes. Due to
It is possible to reduce the fluctuation of the center frequency and the attenuation pole of the filter characteristic.

In the first laminated stripline filter of the present invention, in the above structure, the ground connecting conductor and the connecting conductor are the through conductor formed inside the dielectric layer and / or the terminal electrode formed on the side surface. By this, the design flexibility of the laminated stripline filter formed inside the plurality of laminated dielectric layers is improved, and a small and high-performance laminated stripline is provided. be able to.

According to the second laminated stripline filter of the present invention, the width W1 of the first open-ended rectangular resonant electrode is
Is W1 <with respect to the width W2 of the second rectangular electrode with one open end.
W2, and the second one-end open rectangular resonance electrode is arranged so as to cover the first one-end open rectangular resonance electrode when viewed from the stacking direction, has substantially the same width W3, and is viewed from the stacking direction. The first and the second one-end short-circuited rectangular resonance electrodes, which are arranged so as to be substantially overlapped with each other, are electrically connected to each other through connection conductors arranged at intervals of ⅛ or less of the wavelength of the center frequency to be integrated. A rectangular resonant electrode with a short-circuited one end
With respect to this width W3, the width W4 of the third one-sided short-circuited rectangular resonance electrode is W3 <W4, and the third one-sided short-circuited rectangular resonance electrode is seen from the stacking direction. Since the shape resonance electrodes are disposed so as to cover the shape resonance electrodes, even when a stacking error occurs in the process of stacking a plurality of dielectric layers, the first and the second one-end open rectangular resonance electrodes are separated by the stacking error. And a change in the amount of electromagnetic field coupling between the integrated first and second single-ended short-circuited rectangular resonant electrodes and the third single-ended short-circuited rectangular resonant electrode. Therefore, the center frequency of the filter characteristic and the variation of the attenuation pole can be reduced.

Further, the second laminated stripline filter of the present invention has the above-mentioned structure, in which the ground connection conductor and the connection conductor are the through conductor formed inside the dielectric layer and / or the terminal electrode formed on the side surface. By this, the design flexibility of the laminated stripline filter formed inside the plurality of laminated dielectric layers is improved, and a small and high-performance laminated stripline is provided. be able to.

As described above, according to the present invention, in the laminated stripline filter, it is possible to reduce the fluctuation of the center frequency of the filter characteristic and the attenuation pole due to the laminating deviation occurring in the step of laminating a plurality of dielectric layers. It was possible to provide a laminated stripline filter capable of achieving the above.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a first laminated stripline filter of the present invention.

FIG. 2 is a perspective plan view showing an example of an embodiment of a first laminated stripline filter of the present invention.

FIG. 3 is a diagram showing an example of insertion loss in the first laminated stripline filter of the present invention and the conventional laminated stripline filter.

FIG. 4 is a diagram showing an example of the amount of change in center frequency with respect to the amount of stacking deviation in the width direction in the first multilayer stripline filter of the present invention and the conventional multilayer stripline filter.

FIG. 5 is a diagram showing an example of the amount of change in the attenuation pole with respect to the amount of misalignment in the width direction of the first laminated stripline filter of the present invention and the conventional laminated stripline filter.

FIG. 6 is a perspective view showing an example of an embodiment of a second laminated stripline filter of the present invention.

FIG. 7 is a perspective plan view showing an example of an embodiment of a second laminated stripline filter of the present invention.

FIG. 8 is a diagram showing an example of insertion loss in the second laminated stripline filter of the present invention and the conventional laminated stripline filter.

FIG. 9 is a perspective view showing an example of a conventional laminated stripline filter.

FIG. 10 is a perspective plan view showing an example of a conventional laminated stripline filter.

[Explanation of symbols]

21, 41 ... First dielectric layer 22, 42 ... Second dielectric layer 23, 43 ... Third dielectric layer 24, 44 ... Fourth dielectric layer 30, 50 ... First ground electrode 31, 51 ... Second ground electrode 32, 52 ... First rectangular electrode with one open end 33, 53 ... First short-circuited rectangular resonance electrode 34 ... Third rectangular electrode with one open end 35, 57 ... Second one end short-circuited rectangular resonance electrode 36, 54 ... Second rectangular electrode with open end 55 ... Third short-circuited rectangular resonance electrode 38, 58 ... Connecting conductor 39, 59 ... Open end 40, 60 ... Short-circuited end

Claims (4)

[Claims] 1. A first dielectric layer, a second dielectric layer laminated on the first dielectric layer, and a third dielectric layer laminated on the second dielectric layer. A dielectric layer, a fourth dielectric layer laminated on the third dielectric layer, a first ground electrode arranged on the lower surface of the first dielectric layer, and the fourth dielectric layer. A second ground electrode disposed on the upper surface of the dielectric layer, a first open-ended rectangular resonance electrode and a first short-ended rectangular resonance disposed between the first and second dielectric layers. An electrode, a second one-end open rectangular resonance electrode arranged between the second and third dielectric layers, and a third one-end arranged between the third and fourth dielectric layers It is composed of an open rectangular resonant electrode and a second short-circuited rectangular resonant electrode, and the thickness h1 of the first dielectric layer is h relative to the thickness h2 of the fourth dielectric layer.
1 <h2, and the first and second open-ended rectangular resonance electrodes have substantially the same width W1, and this width W1
On the other hand, the width W2 of the third one-end open rectangular resonance electrode is W
1 <W2, the first to third open-ended rectangular resonant electrodes have substantially the same length, are parallel to each other when viewed in the stacking direction, and are the open-ended first and second open-ended rectangular electrodes. The shape resonance electrodes are substantially overlapped with each other, and the third one-end open rectangular resonance electrode is arranged so as to cover the first and second one-end open rectangular resonance electrodes, and the first and second one-end short-circuited rectangular resonance electrodes are arranged. The electrodes are electrically connected to the first or second ground electrodes via ground connection conductors on the short-circuit side, and the width W3 of the first one-end short-circuit rectangular resonance electrode is the second one-end short-circuit rectangular shape. W3 <W4 with respect to the width W4 of the resonance electrode, and further, the first and second one-end short-circuited rectangular resonance electrodes have substantially the same length and are parallel to each other when viewed from the stacking direction.
The second one-sided short-circuited rectangular resonance electrode is arranged to cover the first one-sided short-circuited rectangular resonance electrode, and the first and second ground electrodes have the first to third one-sided open rectangular shapes. The resonance electrode and the first and second one-end short-circuited rectangular resonance electrodes are arranged so as to cover the resonance electrode and the end opposite to the open end of the first one-end open rectangular resonance electrode, and the first one-end short circuit. The short-circuited end of the rectangular resonance electrode is electrically connected to the opposite end, and the third single-ended open rectangular resonance electrode has an end opposite to the open end and the second single-ended short-circuited rectangular shape. The short-circuited end and the opposite end of the resonance electrode are electrically connected, and the first one-end open rectangular resonance electrode and the second one-end open rectangular resonance electrode have a center frequency of 8 Being electrically connected through connecting conductors arranged at intervals of less than one-half Laminated strip line filter having a butterfly. 2. The laminated strip according to claim 1, wherein the ground connecting conductor and the connecting conductor are through conductors formed inside the dielectric layer and / or terminal electrodes formed on side surfaces. Line filter. 3. A first dielectric layer, a second dielectric layer laminated on the first dielectric layer, and a third dielectric layer laminated on the second dielectric layer. A dielectric layer, a fourth dielectric layer laminated on the third dielectric layer, a first ground electrode arranged on the lower surface of the first dielectric layer, and the fourth dielectric layer. A second ground electrode disposed on the upper surface of the dielectric layer, a first open-ended rectangular resonance electrode and a first short-ended rectangular resonance disposed between the first and second dielectric layers. An electrode, a second one-end short-circuited rectangular resonance electrode arranged between the second and third dielectric layers, and a second one-end arranged between the third and fourth dielectric layers It is composed of an open rectangular resonance electrode and a third short-circuited rectangular resonance electrode, and the thickness h1 of the first dielectric layer is h relative to the thickness h2 of the fourth dielectric layer.
1 <h2 and the width W1 of the first open-ended rectangular resonant electrode is W1 <W2 with respect to the width W2 of the open second open-ended rectangular resonant electrode, and the first and second open ends The open rectangular resonance electrodes have substantially the same length and are arranged in parallel when viewed from the stacking direction, and the second one-end open rectangular resonance electrode is arranged so as to cover the first one-end open rectangular resonance electrode. The first to third one-side short-circuited rectangular resonance electrodes are respectively connected to the first through the ground connection conductor on the short-circuit side.
Alternatively, the first and second one-sided short-circuited rectangular resonance electrodes are electrically connected to the second ground electrode, and the first and second one-sided short-circuited rectangular resonance electrodes have substantially the same width W3. W3 <W4 with respect to the width W4 of
The third one-end short-circuited rectangular resonance electrode has substantially the same length,
The first and second single-ended short-circuited rectangular resonant electrodes are substantially parallel to each other when viewed in the stacking direction, and the third single-ended short-circuited rectangular resonant electrode is overlapped with the first and second single-ended short-circuited rectangular resonant electrodes. And the first and second ground electrodes are arranged so as to cover the first and second one-end open rectangular resonance electrodes and the first to third one-end short-circuited rectangular resonance electrodes. An end of the first open-ended rectangular resonant electrode opposite to the open end and an end of the first open-ended rectangular resonant electrode opposite to the open end are electrically connected, The end of the second one-end open rectangular resonance electrode opposite to the open end and the end of the third one-end short-circuit rectangular resonance electrode opposite to the short-end are electrically connected, and The first one-end short-circuited rectangular resonance electrode and the second one-end short-circuited rectangular resonance electrode. 1 door is of the wavelength of the center frequency of 8 minutes
A laminated stripline filter, which is electrically connected through connection conductors arranged at the following intervals. 4. The laminated strip according to claim 3, wherein the ground connecting conductor and the connecting conductor are through conductors formed inside the dielectric layer and / or terminal electrodes formed on side surfaces. Line filter.