WO2022070885A1 - 縦結合共振子型弾性波フィルタ及び弾性波フィルタ - Google Patents
縦結合共振子型弾性波フィルタ及び弾性波フィルタ Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14538—Formation
- H03H9/14541—Multilayer finger or busbar electrode
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14538—Formation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/643—Means for obtaining a particular transfer characteristic the transfer characteristic being determined by reflective or coupling array characteristics
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/6436—Coupled resonator filters having one acoustic track only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6423—Means for obtaining a particular transfer characteristic
- H03H9/6433—Coupled resonator filters
- H03H9/6483—Ladder SAW filters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
- H03H9/72—Networks using surface acoustic waves
- H03H9/725—Duplexers
Definitions
- the present invention relates to a longitudinally coupled resonator type elastic wave filter having a plurality of IDT electrodes and first and second reflectors, and an elastic wave filter including the same.
- the bridge capacitance is connected in parallel with the longitudinally coupled resonator type elastic wave filter between the input end and the output end of the vertically coupled resonator type elastic wave filter.
- An object of the present invention is to provide a longitudinally coupled resonator type elastic wave filter and an elastic wave filter that can improve the attenuation characteristics on the high frequency side of the passband without causing an increase in size.
- the longitudinally coupled resonator type elastic wave filter according to the present invention has a plurality of IDT electrodes including a first IDT electrode and a second IDT electrode, and a second IDT electrode arranged on both sides of the plurality of IDT electrodes in the elastic wave propagation direction.
- a reflector of 1 and a second reflector are provided, and the plurality of IDT electrodes are connected to a hot-side potential and a ground-side comb-shaped electrode, respectively.
- the hot side comb-shaped electrode of the first IDT electrode is electrically connected to at least one of the first reflector and the second reflector, and the first IDT is
- the second IDT electrode is placed between the electrode and at least one of the first reflector and the second reflector to which the comb-shaped electrode on the hot side of the first IDT electrode is connected.
- the hot-side comb-shaped electrode of the first IDT electrode is connected to one of the input end and the output end, and the comb-shaped electrode is connected to the hot-side potential of the second IDT electrode.
- the electrode is connected to the other of the input end and the output end.
- the present invention it is possible to provide a longitudinally coupled resonator type elastic wave filter and an elastic wave filter that can improve the attenuation characteristics on the high frequency side of the pass band without causing an increase in size.
- FIG. 1 is a circuit diagram of a longitudinally coupled resonator type elastic wave filter according to the first embodiment of the present invention.
- FIG. 2 is a schematic circuit diagram of a longitudinally coupled resonator type elastic wave filter according to the first embodiment of the present invention.
- FIG. 3 is a circuit diagram showing a composite filter device having a longitudinally coupled resonator type elastic wave filter according to the first embodiment of the present invention.
- FIG. 4 is a diagram showing the attenuation-frequency characteristics of the reception filters of Example 1 and Comparative Example 1 including the longitudinally coupled resonator type elastic wave filters of Example 1 and Comparative Example 1.
- FIG. 5 is a schematic circuit diagram of a longitudinally coupled resonator type elastic wave filter according to a second embodiment of the present invention.
- FIG. 6 is a diagram showing the attenuation-frequency characteristics of the reception filters of Example 2 and Comparative Example 2.
- FIG. 7 is a schematic circuit diagram of a longitudinally coupled resonator type elastic wave filter according to a third embodiment of the present invention.
- FIG. 8 is a schematic circuit diagram of a longitudinally coupled resonator type elastic wave filter according to a fourth embodiment of the present invention.
- FIG. 9 is a schematic circuit diagram of a longitudinally coupled resonator type elastic wave filter according to a fifth embodiment of the present invention.
- FIG. 1 is a circuit diagram of a longitudinally coupled resonator type elastic wave filter according to the first embodiment of the present invention. Further, FIG. 2 is a schematic circuit diagram of this longitudinally coupled resonator type elastic wave filter.
- the longitudinally coupled resonator type elastic wave filter 1 has a plurality of IDT electrodes 2 to 6.
- the IDT electrodes 2 to 6 are arranged along the elastic wave propagation direction.
- the elastic wave propagation direction is a direction orthogonal to the extending direction of the electrode fingers of the IDT electrodes 2 to 6.
- the first and second reflectors 7 and 8 are provided on both sides of the elastic wave propagation direction in the region where the IDT electrodes 2 to 6 are provided.
- the longitudinally coupled resonator type elastic wave filter 1 is a 5IDT type longitudinally coupled resonator type elastic wave filter having five IDT electrodes 2 to 6.
- the vertically coupled resonator type elastic wave filter 1 is a Band 20 receiving filter. Therefore, the reception band is 791 MHz to 821 MHz.
- the input terminal 9 is a part connected to the antenna terminal.
- the output terminal 10 is a receiving terminal and outputs a received signal.
- the IDT electrodes 2 to 6 have a pair of comb-shaped electrodes 2a, 2b to 6a, 6b, respectively.
- the comb-shaped electrode 2a has a plurality of first electrode fingers 2a1.
- the comb-shaped electrode 2b has a plurality of second electrode fingers 2b1.
- the plurality of first electrode fingers 2a1 and the plurality of second electrode fingers 2b1 are interleaved with each other.
- the direction orthogonal to the extending direction of the first electrode finger 2a1 and the second electrode finger 2b1 is the above-mentioned elastic wave propagation direction.
- the comb-shaped electrodes 3a, 3b to 6a, 6b of the IDT electrodes 3 to 6 also have the same structure as the comb-shaped electrodes 2a, 2b.
- the first and second reflectors 7 and 8 have a structure in which both ends of a plurality of electrode fingers are short-circuited. That is, the first and second reflectors 7 and 8 are grating type reflectors.
- the comb-shaped electrode 2a of the IDT electrode 2, the comb-shaped electrode 4a of the IDT electrode 4, and the comb-shaped electrode 6a of the IDT electrode 6 are connected to the input terminal 9. That is, the comb-shaped electrodes 2a, 4a, 6a are connected to the hot side potential. On the other hand, the comb-shaped electrodes 2b, 4b, 6b are commonly connected and connected to the ground side potential. Therefore, the comb-shaped electrodes 2a, 4a, 6a are the hot-side comb-shaped electrodes in the IDT electrodes 2, 4, and 6, and the comb-shaped electrodes 2b, 4b, 6b are the ground-side comb-shaped electrodes.
- the comb-shaped electrodes 3b and 5b of the IDT electrodes 3 and 5 are commonly connected and connected to the output terminal 10.
- the comb-shaped electrodes 3a and 5a are commonly connected and connected to the ground side potential. Therefore, in the IDT electrodes 3 and 5, the comb-shaped electrodes 3b and 5b are the hot-side comb-shaped electrodes, and the comb-shaped electrodes 3a and 5a are the ground-side comb-shaped electrodes.
- the features of the vertically coupled resonator type elastic wave filter 1 are in the following 1) to 4).
- 1) The comb-shaped electrodes 3b and 5b on the hot side of the IDT electrodes 3 and 5 corresponding to the first IDT electrode of the present invention are connected to the first reflector 7 and the second reflector 8.
- 2) IDT electrodes 2 and 6 corresponding to the second IDT electrode are arranged between the IDT electrodes 3 and 5 corresponding to the first IDT electrode and the first and second reflectors 7 and 8, respectively. Has been done.
- the comb-shaped electrodes 3b and 5b on the hot side of the IDT electrodes 3 and 5 corresponding to the first IDT electrode are connected to the output terminal 10.
- FIG. 3 is a circuit diagram showing a composite filter device 11 having a longitudinally coupled resonator type elastic wave filter 1 according to the first embodiment of the present invention.
- the composite filter device 11 has an antenna terminal 12.
- the antenna terminal 12 is connected to the antenna.
- a reception filter 13 is connected between the antenna terminal 12 and the output terminal 10.
- a transmission filter 15 is connected between the antenna terminal 12 and the transmission terminal 14.
- the composite filter device 11 is a duplexer having a receive filter 13 and a transmit filter 15.
- the composite filter device 11 one or two or more other band-passing type filters may be connected in addition to the reception filter 13 and the transmission filter 15. That is, the composite filter device 11 may be a multiplexer such as a triplexer.
- the receiving filter 13 has series arm resonators S1 and S2 connected in series with the longitudinally coupled resonator type elastic wave filter 1. Further, the parallel arm resonator P1 is connected between the connection point between the series arm resonator S1 and the series arm resonator S2 and the ground side potential.
- the receiving filter 13 is an elastic wave filter according to the present invention. However, the elastic wave filter according to the present invention is not limited to the receiving filter.
- the longitudinally coupled resonator type elastic wave filter 1 of the first embodiment was configured.
- the first and second reflectors 7 and 8 are not electrically connected to the comb-shaped electrodes 3b and 5b on the hot side of the IDT electrodes 3 and 5, and the first and second reflectors 7 and 8 are connected.
- the longitudinally coupled resonator type elastic wave filter of Comparative Example 1 was configured in the same manner as in Example 1 above, except that the state was floated.
- FIG. 4 shows the attenuation-frequency characteristics of the reception filters of Example 1 and Comparative Example 1 including the longitudinally coupled resonator type elastic wave filter of Example 1 and Comparative Example 1.
- the solid line in FIG. 4 shows the attenuation-frequency characteristics of the reception filter of Example 1, and the broken line shows the attenuation-frequency characteristics of Comparative Example 1.
- Example 1 As is clear from FIG. 4, according to Example 1 as compared with Comparative Example 1, a large amount of attenuation is obtained from 830 MHz to 855 MHz on the high passband side. Therefore, the attenuation characteristics on the high frequency side of the pass band are effectively improved.
- the frequency range A is the pass band on the transmission side of the Band 20. Therefore, according to the first embodiment, it can be seen that it is possible to provide a reception filter of the Band 20 in which the amount of attenuation in the pass band on the transmission side of the Band 20 is sufficiently secured.
- the capacitance refers to the capacitance of the characteristic impedance due to the wiring provided on the piezoelectric substrate and the capacitance generated between a plurality of adjacent IDT electrodes.
- the first IDT electrode that is not adjacent to the first and second reflectors 7 and 8, that is, the wiring on the hot side of the IDT electrodes 3 and 5 in the present embodiment and the first and second reflectors It is considered that the above-mentioned capacitive component is formed by connecting the reflectors 7 and 8. As a result, it is considered that the attenuation pole approaches the passband and the amount of attenuation in the vicinity of the passband on the high frequency side of the passband is increased.
- the above-mentioned capacitance component is used due to the above-mentioned electrical connection structure, it is not necessary to separately provide a capacitor for constructing the cross-linking capacitance on the piezoelectric substrate. Therefore, it is possible to improve the attenuation characteristics on the high frequency side of the pass band without causing an increase in size.
- the comb-shaped electrodes 3b and 5b on the hot side of the IDT electrodes 3 and 5 as the first IDT electrodes are commonly connected to the first and second reflectors 7 and 8 and connected to the output terminal 10. It had been.
- the present invention is not limited to such a connection structure.
- the second to fifth embodiments will be described.
- the circuit configuration is shown by a schematic circuit diagram as in FIG. 2.
- FIG. 5 is a schematic circuit diagram of a longitudinally coupled resonator type elastic wave filter according to a second embodiment of the present invention.
- the longitudinally coupled resonator type elastic wave filter 21 of the second embodiment five IDT electrodes 2 to 6 are arranged in the elastic wave propagation direction.
- the first and second reflectors 7 and 8 are arranged on both sides of the region where the IDT electrodes 2 to 6 are provided.
- the longitudinally coupled resonator type elastic wave filter 21 it corresponds to the second IDT electrode between the IDT electrodes 3 and 5 corresponding to the first IDT electrode and the first and second reflectors 7 and 8. IDT electrodes 2 and 6 are arranged.
- the comb-shaped electrodes on the hot side of the IDT electrodes 3 and 5 connected to the input terminal 9 are electrically connected to the first and second reflectors 7 and 8. It is in. That is, the hot side comb-shaped electrodes of the IDT electrodes 3 and 5 are connected to the input terminal 9. The first and second reflectors 7 and 8 are also connected to the input terminal 9. The comb-shaped electrodes on the hot side of the IDT electrodes 2, 4 and 6 are connected to the output terminal 10.
- the comb-shaped electrode on the hot side of the first IDT electrode may be connected to the input terminal 9, in which case the comb-shaped electrode on the hot side of the second IDT electrode is the output terminal. It is connected to 10.
- the vertically coupled resonator type elastic wave filter 21 has the same other configurations as the vertically coupled resonator type elastic wave filter 1.
- Example 2 having the vertically coupled resonator type elastic wave filter 21 was configured in the same manner as in Example 1. However, in the second embodiment, in the longitudinally coupled resonator type elastic wave filter 21, the electrode fingers of the IDT electrodes 2 and 6 adjacent to the first and second reflectors 7 and 8 are connected to the ground side potential. Is.
- the first and second reflectors 7 and 8 of the vertically coupled resonator type elastic wave filter in the receiving filter of the second embodiment are electrically connected to the comb-shaped electrodes on the hot side of the IDT electrodes 3 and 5.
- the same reception filter as in the second embodiment was configured except that it was not connected to.
- FIG. 6 is a diagram showing the attenuation-frequency characteristics of the reception filters of Example 2 and Comparative Example 2.
- the solid line shows the result of Example 2, and the broken line shows the result of Comparative Example 2.
- the frequency domain A indicates the pass band of the Band 20 transmission filter.
- Example 2 the amount of attenuation in the high pass band side, particularly in the transmission band of Band 20, is sufficiently larger than that in Comparative Example 2. Therefore, it can be seen that, as in the first embodiment, the amount of attenuation on the high frequency side of the pass band can be increased without causing an increase in size.
- Example 2 when compared with Example 1 of FIG. 4, in Example 2, the effect of improving the amount of attenuation on the high frequency side of the pass band is small. This is because the polarity of the electrode fingers of the IDT electrodes 2 and 6 adjacent to the first and second reflectors 7 and 8 is set to the ground side potential, so that the effect of bringing the attenuation pole closer to the pass band is reduced. It is thought that this is because.
- FIG. 7 is a schematic circuit diagram of a longitudinally coupled resonator type elastic wave filter according to a third embodiment of the present invention.
- the longitudinally coupled resonator type elastic wave filter 31 has three IDT electrodes 32 to 34.
- the first and second reflectors 35 and 36 are provided on both sides of the region where the IDT electrodes 32 to 34 are provided.
- the number of a plurality of IDT electrodes in the longitudinally coupled resonator type elastic wave filter is not particularly limited, and a 3IDT type longitudinally coupled resonator type elastic wave filter may be used.
- the IDT electrode 33 corresponds to the first IDT electrode
- the IDT electrode 32 corresponding to the second IDT electrode is arranged between the IDT electrode 33 and the first reflector 35.
- the IDT electrode 34 corresponding to the second IDT electrode is arranged between the IDT electrode 33 corresponding to the first IDT electrode and the second reflector 36.
- the hot side comb-shaped electrode connected to the output terminal 10 of the IDT electrode 33 is connected to the first and second reflectors 35 and 36. Therefore, also in the present embodiment, the attenuation amount on the high frequency side of the pass band can be improved as in the first and second embodiments.
- FIG. 8 is a schematic circuit diagram of a longitudinally coupled resonator type elastic wave filter according to a fourth embodiment of the present invention.
- the longitudinally coupled resonator type elastic wave filter 41 has three IDT electrodes 42 to 44 and first and second reflectors 45 and 46. Therefore, the longitudinally coupled resonator type elastic wave filter 41 is a 3IDT type longitudinally coupled resonator type elastic wave filter.
- the IDT electrode 44 corresponding to the second IDT electrode is connected between the IDT electrode 43 corresponding to the first IDT electrode and the second reflector 46.
- the comb-shaped electrode connected to the output terminal 10 of the IDT electrode 43, that is, the comb-shaped electrode on the hot side is connected to the second reflector 46.
- the attenuation amount on the high frequency side of the pass band can be improved as in the first to third embodiments.
- the first reflector 45 is not connected to the IDT electrode 43 corresponding to the first IDT electrode. As described above, only the second reflector 46 of the first and second reflectors 45 and 46 may be connected to the comb-shaped electrode on the hot side of the first IDT electrode.
- At least one of the first and second reflectors may be connected to the comb-shaped electrode on the hot side of the first IDT electrode. Even in this case, the amount of attenuation on the high frequency side of the pass band can be improved.
- FIG. 9 is a schematic circuit diagram of a longitudinally coupled resonator type elastic wave filter according to a fifth embodiment of the present invention.
- the longitudinally coupled resonator type elastic wave filter 51 has two IDT electrodes 52 and 53.
- First and second reflectors 54 and 55 are provided on both sides of the region where the IDT electrodes 52 and 53 are provided.
- the number of the plurality of IDT electrodes 52 and 53 may be an even number.
- the second reflector 55 is connected to the comb-shaped electrode on the hot side of the IDT electrode 52 on the input terminal 9 side. Therefore, on the input terminal 9 side, the IDT electrode 52 corresponds to the first IDT electrode, and the IDT electrode 53 corresponds to the second IDT electrode. Therefore, the amount of attenuation on the high frequency side of the pass band can be improved.
- the comb-shaped electrode on the hot side of the IDT electrode 53 is connected to the first reflector 54.
- the IDT electrode 53 corresponds to the first IDT electrode
- the IDT electrode 52 corresponds to the second IDT electrode.
- the amount of attenuation on the high frequency side of the pass band can be improved by the above-mentioned electrical connection structure on the output terminal 10 side.
- the number of the plurality of IDT electrodes may be an odd number or an even number.
- the IDT electrode adjacent to the first reflector becomes the second IDT electrode, and the second IDT electrode is used.
- the IDT electrode located on the side opposite to the first reflector of the IDT electrode 2 corresponds to the first IDT electrode.
- n is an odd number
- IDT electrodes in a structure in which the n IDT electrodes are arranged from the first reflector side toward the second reflector side.
- the IDT electrode located evenly from the first reflector side is the first IDT electrode
- the odd IDT electrode adjacent to the first and second reflectors is the second IDT electrode.
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Abstract
Description
2,3,4,5,6…IDT電極
2a,2b,3a,3b,4a,4b,5a,5b,6a,6b…櫛形電極
2a1,2b1……第1,第2の電極指
7,8…第1,第2の反射器
9…入力端子
10…出力端子
11…複合フィルタ装置
12…アンテナ端子
13…受信フィルタ
14…送信端子
15…送信フィルタ
32,33,34…IDT電極
35,36…第1,第2の反射器
42,43,44…IDT電極
45,46…第1,第2の反射器
52,53…IDT電極
54,55…第1,第2の反射器
P1…並列腕共振子
S1,S2…直列腕共振子
Claims (13)
- 第1のIDT電極及び第2のIDT電極を含む複数のIDT電極と、
前記複数のIDT電極の弾性波伝搬方向両側に配置された、第1の反射器及び第2の反射器と、
を備え、
前記複数のIDT電極がそれぞれ、ホット側電位に接続されるホット側の櫛形電極と、グラウンド側電位に接続されるグラウンド側の櫛形電極とを有し、
前記第1のIDT電極の前記ホット側の櫛形電極が、前記第1の反射器及び前記第2の反射器のうち少なくとも一方に電気的に接続されており、
前記第1のIDT電極と、前記第1のIDT電極の前記ホット側の櫛形電極が接続されている前記第1の反射器及び前記第2の反射器のうち少なくとも一方との間に、前記第2のIDT電極が配置されており、
前記第1のIDT電極の前記ホット側の櫛形電極が、入力端及び出力端のうち一方に接続されており、前記第2のIDT電極の前記ホット側電位に接続される櫛形電極が、入力端及び出力端のうち他方に接続されている、縦結合共振子型弾性波フィルタ。 - 前記第1のIDT電極が、前記第1及び第2の反射器のうちの一方に電気的に接続されている、請求項1に記載の縦結合共振子型弾性波フィルタ。
- 前記第1のIDT電極が、前記第1及び第2の反射器の双方に電気的に接続されている、請求項1に記載の縦結合共振子型弾性波フィルタ。
- 前記第2のIDT電極が、前記第1のIDT電極の前記ホット側の櫛形電極が接続されている前記第1及び第2の反射器のうち少なくとも一方と隣接しており、
前記第2のIDT電極における、前記第1または前記第2の反射器と隣接している電極指が、ホット側電位に接続される、請求項1~3のいずれか1項に記載の縦結合共振子型弾性波フィルタ。 - 前記第2のIDT電極が、前記第1のIDT電極の前記ホット側の櫛形電極が接続されている前記第1及び第2の反射器の少なくとも一方と隣接しており、
前記第2のIDT電極における、前記第1または前記第2の反射器と隣接している電極指が、グラウンド側電位に接続される、請求項1~3のいずれか1項に記載の縦結合共振子型弾性波フィルタ。 - 前記複数のIDT電極が、n(nは奇数)個のIDT電極を含み、前記n個のIDT電極のうち、前記第1の反射器側から偶数番目に位置している前記IDT電極が前記第1のIDT電極であり、前記第1及び前記第2の反射器に隣接している奇数番目の前記IDT電極が前記第2のIDT電極である、請求項1~5のいずれか1項に記載の縦結合共振子型弾性波フィルタ。
- 前記第1のIDT電極の前記ホット側の櫛形電極が出力端に接続されており、前記第2のIDT電極の前記ホット側の櫛形電極が入力端に接続されている、請求項6に記載の縦結合共振子型弾性波フィルタ。
- 前記第1のIDT電極の前記ホット側の櫛形電極が入力端に接続されており、前記第2のIDT電極の前記ホット側の櫛形電極が出力端に接続されている、請求項6に記載の縦結合共振子型弾性波フィルタ。
- 前記nが5である、請求項7または8に記載の縦結合共振子型弾性波フィルタ。
- 前記nが3である、請求項7または8に記載の縦結合共振子型弾性波フィルタ。
- 前記複数のIDT電極が、m(mは偶数)個のIDT電極を含み、前記m個のIDT電極のうち、前記第1の反射器に隣接している前記IDT電極が前記第2のIDT電極であり、前記第2のIDT電極の前記第1の反射器とは反対側に位置しているIDT電極が前記第1のIDT電極である、請求項1~5のいずれか1項に記載の縦結合共振子型弾性波フィルタ。
- 前記mが2であり、前記第1のIDT電極が前記第1の反射器に接続されており、かつ前記第2の反射器に隣接しており、前記第2の反射器が前記第2のIDT電極と接続されている、請求項11に記載の縦結合共振子型弾性波フィルタ。
- 入力端と出力端とを結ぶ直列腕を有し、前記直列腕において、請求項1~12のいずれか1項に記載の縦結合共振子型弾性波フィルタと、直列腕共振子とが直列に接続されており、前記直列腕とグラウンド側電位との間に少なくとも1つの並列腕共振子が接続されている、弾性波フィルタ。
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JP2017118587A (ja) * | 2013-02-27 | 2017-06-29 | 京セラ株式会社 | 弾性波素子、分波器および通信モジュール |
WO2017221545A1 (ja) * | 2016-06-24 | 2017-12-28 | 株式会社村田製作所 | 弾性波素子および弾性波フィルタ装置 |
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