WO2012063446A1 - 弾性波装置 - Google Patents
弾性波装置 Download PDFInfo
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- WO2012063446A1 WO2012063446A1 PCT/JP2011/006181 JP2011006181W WO2012063446A1 WO 2012063446 A1 WO2012063446 A1 WO 2012063446A1 JP 2011006181 W JP2011006181 W JP 2011006181W WO 2012063446 A1 WO2012063446 A1 WO 2012063446A1
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- elastic wave
- wave resonator
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- band
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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
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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
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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
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
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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
- H03H9/0023—Balance-unbalance or balance-balance networks
- H03H9/0028—Balance-unbalance or balance-balance networks using surface acoustic wave devices
- H03H9/0047—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks
- H03H9/0052—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded
- H03H9/0057—Balance-unbalance or balance-balance networks using surface acoustic wave devices having two acoustic tracks being electrically cascaded the balanced terminals being on the same side of the tracks
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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
Definitions
- the present invention relates to an elastic wave device mainly used in mobile communication devices and the like.
- FIG. 10 is a circuit diagram of a conventional elastic wave device 100. As shown in FIG. 10
- an elastic wave device 100 includes an unbalance-balance conversion low-pass filter 2 and an unbalance-balance conversion high-pass filter 3 provided on a piezoelectric substrate 1 made of a piezoelectric single crystal. And.
- the low pass filter 2 has a passband with a relatively low center frequency.
- the high-pass filter 3 has a passband with a relatively high center frequency.
- the low-pass filter 2 and the high-pass filter 3 are each configured by connecting a longitudinally coupled elastic wave resonator 6 and a one-terminal pair acoustic wave resonator 7 in series between the unbalanced terminal 4 and the balanced terminal 5, respectively. ing.
- Another electronic circuit is connected to the balanced terminal 5 connected to the low-pass filter 2 of the elastic wave device 100 and the balanced terminal 5 connected to the high-pass filter 3.
- Elastic wave device 100 performs filtering of electrical signals in a plurality of different frequency bands.
- patent document 1 is known, for example.
- the low band side filter 2 and the high band side filter 3 are connected via the balanced terminal 5. Therefore, the low-pass filter 2 and the high-pass filter 3 on the balanced terminal 5 side are affected by each other's impedance and the isolation is degraded. In addition, the insertion loss is increased due to the impedance mismatch between the low band side filter 2 and the high band side filter 3, and the degree of balance is reduced. As a result, the electrical characteristics of the elastic wave device 100 are degraded.
- An elastic wave device has a low band side filter having a low band side pass band, a high band side filter having a high band side pass band, and first and second balanced terminals.
- the low pass filter is connected to the first unbalanced terminal.
- the lower passband is a frequency band from the first minimum frequency to the first maximum frequency.
- the high pass filter is connected to the second unbalanced terminal.
- the high pass band is a frequency band from the second minimum frequency to the second maximum frequency.
- the first and second balanced terminals are commonly connected to the low band and high band filters.
- the low-pass filter has a first longitudinally coupled elastic wave resonator and a first one-port acoustic wave resonator connected in series to the first longitudinally coupled elastic wave resonator.
- the antiresonance frequency of the first one-port acoustic wave resonator is set to be higher than the first maximum frequency and lower than the second minimum frequency.
- This elastic wave device suppresses the mixing of the signal to the other filter and improves the impedance matching in the pass band.
- FIG. 1A is a circuit diagram of an elastic wave device according to a first embodiment.
- FIG. 1B is a circuit diagram of an elastic wave device of a comparative example.
- FIG. 2A is a conceptual diagram of the pass characteristics of the one-terminal pair elastic wave resonator of the elastic wave devices of the example and the comparative example in the first embodiment.
- FIG. 2B is a diagram comparing the values of the resonant frequency and the antiresonant frequency of the one-terminal pair elastic wave resonators of the elastic wave device in the first embodiment and the elastic wave device of the comparative example.
- FIG. 3A is a standing wave ratio characteristic diagram of the elastic wave device in the first embodiment and the comparative example.
- FIG. 3B is a standing wave ratio characteristic diagram of the elastic wave device in the first embodiment and the comparative example.
- FIG. 4 is a standing wave ratio characteristic diagram of the elastic wave device in the first embodiment and the comparative example.
- FIG. 5A is a transmission characteristic diagram of the elastic wave device in the first embodiment and the comparative example.
- FIG. 5B is a transmission characteristic diagram of the elastic wave device in the first embodiment and the comparative example.
- FIG. 6A is an amplitude balance characteristic diagram of the elastic wave device in the first embodiment and the comparative example.
- FIG. 6B is an amplitude balance characteristic diagram of the elastic wave device in the first embodiment and the comparative example.
- FIG. 7A is a phase balance characteristic diagram of the elastic wave device in the first embodiment and the comparative example.
- FIG. 7B is a phase balance characteristic diagram of the elastic wave device in the first embodiment and the comparative example.
- FIG. 8 is a circuit diagram of another elastic wave device according to the first embodiment.
- FIG. 9 is a circuit diagram of an elastic wave device according to a second embodiment.
- FIG. 10 is a circuit diagram of a conventional elastic wave device.
- Embodiment 1 The elastic wave device 101 according to the first embodiment will be described with reference to the drawings.
- FIG. 1A is a circuit diagram of an elastic wave device 101 according to the first embodiment.
- the elastic wave device 101 includes a low-pass filter 12 disposed on the piezoelectric substrate 11 and having a low-pass band PB1 having a relatively low center frequency, and a high-pass filter having a relatively high center frequency. It has a high pass filter 13 having a side pass band PB2.
- the elastic wave device 101 has a first unbalanced terminal 14, a second unbalanced terminal 15, a first balanced terminal 16, and a second balanced terminal 17.
- the unbalanced terminal 14 is connected to the low pass filter 12.
- the unbalanced terminal 15 is connected to the high pass filter 13.
- the balanced terminals 16 and 17 are connected to both the low pass filter 12 and the high pass filter 13.
- the low-pass filter 12 includes a first longitudinally coupled elastic wave resonator 18, a first terminal one-terminal pair elastic wave resonator 19 in the first stage, and a first terminal one-terminal pair elastic wave resonator in the first stage. And 20.
- the longitudinally coupled elastic wave resonator 18 is connected to the unbalanced terminal 14.
- the one-port elastic wave resonator 19 and the one-port elastic wave resonator 20 are connected in series between the longitudinally coupled elastic wave resonator 18 and the balance terminal 16.
- the low-pass filter 12 further includes a second first-stage one-terminal-pair elastic wave resonator 21 and a second second-stage one-terminal-pair elastic wave resonator 22.
- the one-port elastic wave resonator 21 and the one-port elastic wave resonator 22 are connected in series between the longitudinally coupled elastic wave resonator 18 and the balance terminal 17.
- the high-pass filter 13 includes a second longitudinally coupled elastic wave resonator 23, a first terminal pair elastic wave resonator 24 of a third first stage, and a one terminal pair elastic wave resonator of a second stage. And 25.
- the second longitudinally coupled elastic wave resonator 23 is connected to the second unbalanced terminal 15.
- the first-stage one-terminal pair elastic wave resonator 24 and the second-stage one-terminal pair elastic wave resonator 25 are connected in series with each other at a connection point 40 between the longitudinally coupled elastic wave resonator 23 and the balanced terminal 16 It is done.
- the high-pass filter 13 further includes a fourth first-stage one-terminal pair elastic wave resonator 26 and a fourth second-stage one-terminal pair elastic wave resonator 27.
- the one-port elastic wave resonator 26 and the one-port elastic wave resonator 27 are connected in series with each other at a connection point 41 between the longitudinally coupled elastic wave resonator 23 and the balance terminal 17.
- the capacitive element 28 is connected in series between the connection point 40 and the connection point 41.
- the capacitive element 28 is formed of a conductive pattern provided on the piezoelectric substrate 11.
- the low pass band PB1 which is the pass band of the low pass filter 12, is 1.805 GHz to 1.880 GHz.
- the center frequency of the lower passband PB1 is 1.8425 GHz at the midpoint of the passband, its bandwidth is 0.075 GHz, and its relative bandwidth, calculated by dividing the bandwidth by the center frequency, is 4 .07%.
- the high pass band PB2, which is the pass band of the high pass filter 13, is 1.930 GHz to 1.990 GHz.
- the center frequency of high-pass band PB2 is 1.960 GHz at the midpoint of the pass band, its bandwidth is 0.060 GHz, and its relative bandwidth, calculated by dividing the bandwidth by the center frequency, is 3 .06%.
- the antiresonance frequencies fAR19, fAR20, fAR21 and fAR22 of the one-terminal pair elastic wave resonators 19, 20, 21 and 22 are outside the high band of the low band pass band PB1 and the low band of the high band pass band PB2 It is set outside the side band. That is, the antiresonance frequencies fAR19, fAR20, fAR21, and fAR22 of the one-terminal pair elastic wave resonators 19, 20, 21, and 22 are higher than 1.880 GHz, which is the maximum frequency of the low pass band PB1, and on the high pass It is lower than 1.930 GHz which is the minimum frequency of pass band PB2.
- the low band side filter 2 and the high band side filter 3 are connected via the balance terminal 5. Therefore, the low pass filter 2 and the high pass filter 3 on the balanced terminal 5 side are mutually influenced by the impedance. As a result, the signal of the other filter is mixed to degrade the isolation. In addition, the insertion loss is increased due to the impedance mismatch between the low band side filter 2 and the high band side filter 3, and the degree of balance is reduced. As a result, the electrical characteristics of the elastic wave device 100 are degraded.
- FIG. 1B is a circuit diagram of an elastic wave device 111 which is a comparative example.
- the same components as those of the elastic wave device 101 in the first embodiment shown in FIG. 1A are given the same reference numerals.
- the elastic wave device 111 has a low band side filter 112 and a high band side filter 113 instead of the low band side filter 12 of the elastic wave device 101 and the high band side filter 13.
- the low-pass filter 112 includes a first first-stage one-terminal pair elastic wave resonator 19 of the elastic wave device 101, a first second-stage one-terminal pair elastic wave resonator 20, and a second one-stage.
- a first terminal first terminal pair acoustic wave resonator 119 instead of the first terminal pair acoustic wave resonator 21 of the eye and the second terminal one terminal pair acoustic wave resonator 22 of the second stage, a first terminal first terminal pair acoustic wave resonator 119, a first stage The second stage one-terminal-pair acoustic wave resonator 120, the second first-stage one-terminal pair acoustic-wave resonator 121, and the second second-stage one-terminal pair acoustic wave resonator 122 .
- the high-pass filter 113 includes a first third first-stage one-terminal pair elastic wave resonator 24 of the elastic wave device 101, a third second-stage one-terminal pair elastic wave resonator 25, and Instead of the first stage one-terminal-pair acoustic wave resonator 26 in the fourth stage and the fourth stage one-terminal-pair acoustic wave resonator 27 in the fourth stage, the third stage one-terminal pair acoustic wave resonator 124, third-stage one-terminal-pair acoustic wave resonator 125 in the second stage, fourth-stage one-terminal-pair acoustic wave resonator 126 in the first stage, and fourth-stage one-terminal pair acoustic wave resonance in the second stage And the container 127.
- the low pass filter 112 and the high pass filter 113 are connected to the common balanced terminals 16 and 17.
- the antiresonance frequencies fAR119, fAR120, fAR121, fAR122 of the one-terminal pair elastic wave resonators 119, 120, 121, 122 connected in series in the low-pass filter 112 are set in the high-pass band PB2 There is.
- the impedance of the low pass filter 112 viewed from the common balanced terminals 16 and 17 is increased.
- the energy loss flowing from the high-pass filter 113 to the low-pass filter 112 can be minimized.
- FIG. 2A is a conceptual view of the pass characteristics of the one-terminal-pair elastic wave resonator of the elastic wave device 101 of the embodiment and the elastic wave device 111 of the comparative example.
- the solid line indicates the pass characteristic P19 of the one-terminal pair elastic wave resonator 19, the pass characteristic P20 of the one-terminal pair elastic wave resonator 20, the pass characteristic P21 of the one-terminal pair elastic wave resonator 21, the one terminal pair elastic wave A pass characteristic P22 of the resonator 22, a pass characteristic P24 of the one terminal pair elastic wave resonator 24, a pass characteristic P25 of the one terminal pair elastic wave resonator 25, a pass characteristic P26 of the one terminal pair elastic wave resonator 26, a one terminal pair
- the pass characteristic P27 of the elastic wave resonator 27 is shown.
- Resonant frequencies fR19 to fR22 of the one-terminal pair elastic wave resonators 19 to 22 are provided in the low pass band PB1.
- the antiresonance frequencies fAR19 to fAR22 of the one-terminal pair elastic wave resonators 19 to 22 are provided between the maximum frequency of the low pass band PB1 and the minimum frequency of the high pass band PB2.
- the broken line indicates the passing characteristic P119 of the one-terminal pair elastic wave resonator 119 of the elastic wave device 111 which is the comparative example shown in FIG.
- the passing characteristic P120 of the one-terminal pair elastic wave resonator 120, the one-terminal pair A pass characteristic P121 of the elastic wave resonator 121 and a pass characteristic P122 of the one-terminal pair elastic wave resonator 122 are shown.
- the resonance frequencies fR119 to fR122 of the one-terminal-pair elastic wave resonators 119 to 122 are provided in the low pass band PB1.
- the antiresonance frequencies fAR119 to fAR122 of the one-terminal pair elastic wave resonators 119 to 122 are provided in the high-pass band PB2.
- the high pass filter 113 operates as capacitive in the low pass band PB1.
- the antiresonance frequencies fAR119 to fAR122 are in the high pass band PB2
- the impedance of the serially connected one-terminal pair elastic wave resonators 119 to 122 in the filter 112 is growing. Therefore, the low pass filter 112 does not operate as capacitive in the entire band of the high pass band PB2.
- the antiresonance frequencies fAR19 to fAR22 of the one terminal pair elastic wave resonators 19 to 22 of the low band side filter 12 are the maximum frequency and high band side pass of the low band side passband PB1. It is set to the minimum frequency of the band PB2. Therefore, the impedance of the high pass band PB2 in the low pass filter 12 is capacitive. The impedance of the low pass band PB1 in the high pass filter 13 is also capacitive.
- the high-pass band PB2 The low-pass filter 12 operates as capacitive.
- the difference between the impedance in the low pass band PB1 and the impedance in the high pass band PB2 when viewed from the common connection terminals 16 and 17 can be reduced. Therefore, the energy loss flowing out from the high-pass filter 13 to the low-pass filter 12 can be suppressed, and the impedance matching can be improved.
- the antiresonance frequencies fAR19 to fAR22 of the one-terminal acoustic wave resonators 19 to 22 are set near the high band side of the low band pass band PB1, the steepness of the low band filter 12 can be improved. it can.
- the capacitive property of the low-pass filter 12 and the high-pass filter 13 can be canceled by the inductor 101A provided as an external circuit between the balanced terminal 16 and the balanced terminal 17.
- the resonance frequencies fR24 to fR27 of the one-terminal pair elastic wave resonators 24 to 27 of the elastic wave device 101 are provided in the high pass band PB2.
- Anti-resonance frequencies fAR24 to fAR27 of one-terminal pair elastic wave resonators 24 to 27 are set to values outside the high band of high band side pass band PB2, that is, higher than the maximum frequency of high band side pass band PB2 .
- the resonance frequencies fR124 to fR127 of the one-terminal-pair elastic wave resonators 124 to 127 of the comparative example are also provided in the high pass band PB2, and the antiresonance frequencies fAR124 to fAR127 are high bands. It is set to a value higher than the high frequency side out of the high band side band of the side pass band PB2, that is, the maximum frequency of the high band side pass band PB2.
- FIG. 2B shows respective values of resonance frequencies fR19 to fR22, fR24 to fR27, fR119 to fR122, fR124 to fR127 and antiresonance frequencies fAR19 to fAR22, fAR24 to fAR27, fAR119 to fAR122, and fAR124 to fAR127 in the first embodiment.
- resonance frequencies fR19 to fR22, fR24 to fR27, fR119 to fR122, fR124 to fR127 in the first embodiment.
- FIGS. 3A to 7 are characteristic diagrams showing various characteristics of the elastic wave device 101 according to the embodiment and various characteristics of the elastic wave device 111 in the comparative example by simulation.
- solid lines show characteristics obtained as a result of simulation of the elastic wave device 101 using the one-terminal pair elastic wave resonators 19 to 22 and 24 to 27 in FIG. 2B.
- the broken line indicates the characteristics obtained as a result of simulation of the elastic wave device 111 using the one-terminal pair elastic wave resonators 119 to 122 and 124 to 127 of the comparative example in FIG. 2B.
- the frequency range of the marker A to the marker B is the low pass band PB1.
- the marker A represents the minimum frequency of the low pass band PB1
- the marker B represents the maximum frequency of the low pass band PB1.
- the frequency range of the marker C to the marker D is the high pass band PB2. That is, the marker C indicates the minimum frequency of the high pass band PB2, and the marker D indicates the maximum frequency of the high pass band PB2.
- FIG. 3A is a characteristic diagram of the standing wave ratio of the elastic wave device 101 and the standing wave ratio of the elastic wave device 111, as viewed from the unbalanced terminal 14 (low band side unbalanced terminal). From FIG. 3A, in the embodiment, the standing wave ratio of the elastic wave device 101 viewed from the unbalanced terminal 14 is closer to 1 than the standing wave ratio of the elastic wave device 111. From this, it can be seen that the impedance matching of the low-pass filter 12 of the elastic wave device 101 is greatly improved in the low-pass band PB1.
- FIG. 3B is a characteristic diagram of the standing wave ratio of the elastic wave device 101 and the standing wave ratio of the elastic wave device 111 as viewed from the unbalanced terminal 15 (high-range side unbalanced terminal). From FIG. 3B, the standing wave ratio of the elastic wave device 101 viewed from the unbalanced terminal 15 has almost no difference compared with the standing wave ratio of the elastic wave device 111. From this, it can be seen that the matching of the impedance of the elastic wave device 101 in the high pass band PB2 is not deteriorated.
- FIG. 4 is a characteristic diagram of the standing wave ratio of the elastic wave device 101 and the standing wave ratio of the elastic wave device 111 as seen from the balanced terminal 16 and the balanced terminal 17.
- the standing wave ratio of the elastic wave device 101 viewed from the balance terminal 16 and the balance terminal 17 is closer to 1 compared with the standing wave ratio of the elastic wave device 111 and greatly improved. ing. From this, it can be seen that the impedance matching of the elastic wave device 101 is greatly improved.
- FIG. 5A is a transmission characteristic diagram of the low pass filter 12 and the low pass filter 112 including the low pass filter PB1 and the high pass filter PB2.
- the comparative example has a large insertion loss in the low pass band PB1 compared to the example.
- the insertion loss can be reduced particularly in the high band half of the low band pass band PB1, and the electrical characteristics of the elastic wave device are greatly improved. This is because the reflection loss of the electrical signal energy can be reduced by improving the impedance matching of the elastic wave device 101 in this region.
- the embodiment attenuates more sharply than the comparative example, and the insertion loss thereof sharply increases. This is because the antiresonance frequencies fAR19 to fAR22 are closer to the lower pass band PB1 than the antiresonance frequencies fAR119 to fAR122 of the comparative example.
- FIG. 5B is a transmission characteristic diagram of the high-pass filter 13 of the embodiment and the high-pass filter 113 of the comparative example including the low pass filter PB1 and the high pass filter PB2.
- the insertion loss of the high-pass filter 13 and the insertion loss of the high-pass filter 113 do not have a large difference. However, in the vicinity of the minimum frequency of the high pass band PB2, the insertion loss of the elastic wave device 101 is further reduced.
- FIG. 6A is an amplitude balance characteristic diagram of the low band side filter 12 of the embodiment and the low band side filter 112 of the comparative example in the low band side pass band PB1.
- the amplitude balance between the balanced terminals 16 and 17 of the low band filter 12 is greatly improved in the high band half. There is. This is due to the improved impedance matching in this region.
- FIG. 6B is an amplitude balance characteristic diagram of the high band side filter 13 of the embodiment and the high band side filter 113 of the comparative example in the high band side pass band PB2. As shown in FIG. 6B, the amplitude balance between the balanced terminals 16 and 17 of the high-pass filter 13 in the high-pass band PB2 is almost the same as that of the high-pass filter 113.
- FIG. 7A is a phase balance characteristic diagram of the low band side filter 12 of the embodiment and the low band side filter 112 of the comparative example in the low band side pass band PB1. As shown in FIG. 7A, compared with the comparative example, in the high-pass half of the low pass band PB1, the phase balance is largely improved in the embodiment. This is due to the improved impedance matching in this region.
- FIG. 7B is a phase balance characteristic diagram of the high band side filter 13 of the embodiment and the high band side filter 113 of the comparative example in the high band side pass band PB2. As shown in FIG. 7B, in the high pass band PB2, the phase balance between the balanced terminals 16 and 17 of the high pass filter 13 is almost the same as that of the high pass filter 113.
- the antiresonance frequencies fAR19 to fAR22 of the one-terminal pair elastic wave resonators 19 to 22 are outside the high band and high band of the low band pass band PB1. It is provided outside the lower band of the pass band PB2.
- the impedance matching of the low pass filter 12 is improved in the low pass band PB1, and in particular, the insertion loss of the low pass band PB1 is greatly reduced.
- the degree of balance between the phase and the amplitude of the low pass band PB1 can be greatly improved.
- all the antiresonance frequencies fAR19 to fAR22 of the one-terminal acoustic wave resonators 19 to 22 are outside the high band and low band of the low band pass band PB1. Although provided outside the band side, it is not limited to this. For example, at least one of the antiresonance frequencies fAR19 to fAR22 of the one-terminal pair elastic wave resonators 19 to 22 is outside the high band of the low band pass band PB1 and outside the low band of the high band pass band PB2. Even when provided, it has the above-mentioned effect.
- resonance frequencies fR24 to fR27 of one-terminal-pair elastic wave resonators 24 to 27 are provided in high band side pass band PB2, and antiresonance frequencies fAR24 to fAR27 are high band in high band side pass band PB2. It is provided outside the side band.
- at least one of the resonance frequencies fR24 to fR27 of the one-terminal pair elastic wave resonators 24 to 27 is provided in the high pass band PB2, and at least one of the antiresonance frequencies fAR24 to fAR27 is in the high pass band PB2. It may be provided outside the high band. Also by this, the input signal to the high-pass filter 13 can be attenuated more.
- the insertion in the high band portion of the low pass band PB1 is achieved by making the antiresonance frequency fAR20 of the one-terminal acoustic wave resonator 20 different from the antiresonance frequency fAR19 of the one-terminal acoustic wave resonator 19 different. Loss can be reduced.
- the antiresonance frequency fAR19 is made higher than the maximum frequency of the low pass band PB1 and is made lower than the antiresonance frequency fAR20. This can improve the steepness of the attenuation of the input signal in the high band portion of the low band filter 12. This is due to the following reason.
- the one-terminal elastic wave resonator 19 is inductive between the resonant frequency fR19 and the antiresonant frequency fAR19, whereas the longitudinally coupled elastic wave resonator 18 has a high-pass portion of the low pass band PB1. Become capacitive at. Since the one-terminal elastic wave resonator 19 and the longitudinally coupled elastic wave resonator 18 are directly connected, both have conjugate impedances. This makes it possible to match the impedance and to reduce the insertion loss in the high band portion of the low band pass band PB1. Further, the attenuation at the position of the antiresonance frequency fAR 19 of the one-terminal elastic wave resonator 19 can be secured.
- the antiresonance frequency fAR20 higher than the antiresonance frequency fAR19, the amount of attenuation in a region higher than the antiresonance frequency fAR19 of the one-terminal pair elastic wave resonator 19 is secured.
- the antiresonance frequency fAR20 of the one-terminal pair elastic wave resonator 20 is made lower than the minimum frequency of the high pass band PB2.
- the antiresonance frequency fAR22 of the one terminal pair elastic wave resonator 22 and the antiresonance frequency fAR21 of the one terminal pair elastic wave resonator 21 are set to different values, in the high band portion of the low band side passband PB1. Insertion loss can be reduced.
- the antiresonance frequency fAR21 is set higher than the maximum frequency of the low pass band PB1 and set lower than the antiresonance frequency fAR22. This can improve the steepness of the attenuation of the input signal in the high band portion of the low band filter 12. Then, the antiresonance frequency fAR22 is made higher than the antiresonance frequency fAR21.
- the antiresonance frequency fAR22 of the one-terminal pair elastic wave resonator 22 is made lower than the minimum frequency of the high pass band PB2.
- the impedance in the low pass band PB1 and the impedance in the high pass band PB2 when viewed from the balanced terminal 17 which is a common connection terminal. Therefore, the impedance can be matched, and the insertion loss in the low pass band PB1 and the high pass band PB2 can be reduced.
- the antiresonance frequency fAR 25 of the one terminal pair elastic wave resonator 25 of the high-pass filter 13 and the antiresonance frequency fAR 24 of the one terminal pair elastic wave resonator 24 are set to different values. This can suppress the deterioration of the balance degree. Further, by setting the antiresonance frequency fAR 25 higher than the antiresonance frequency fAR 24, the steepness of the attenuation of the input signal in the pass characteristic can be improved.
- the filter characteristic in the high region of the high region side filter 13 is improved. It can be done.
- the antiresonance frequency fAR26 is made higher than the maximum frequency of the high pass band PB2 and is made lower than the antiresonance frequency fAR27. Thereby, the steepness of the attenuation of the input signal in the high band portion of the high band filter 13 can be improved.
- the antiresonance frequency fAR27 is made higher than the antiresonance frequency fAR26. By this, it is possible to secure an attenuation amount in a region higher than the antiresonance frequency fAR 26 of the one-terminal pair elastic wave resonator 26.
- the elastic wave device 101 includes the low band side filter 12 having the low band side pass band PB1, the high band side filter 13 having the high band side pass band PB2, and the balanced terminal 16 And the balance terminal 17.
- the low pass filter 12 is connected to the unbalanced terminal 15.
- the low pass band PB1 is a frequency band from the first minimum frequency to the first maximum frequency.
- the high pass filter 13 is connected to the unbalanced terminal 15.
- the high pass band PB2 is a frequency band from a second minimum frequency higher than the first maximum frequency to a second maximum frequency.
- the balanced terminals 16 and 17 are commonly connected to the low pass filter 12 and the high pass filter 13.
- the low-pass filter 12 has a longitudinally coupled elastic wave resonator 18 and a one-terminal pair acoustic wave resonator 19 connected in series to the longitudinally coupled elastic wave resonator 18.
- the antiresonance frequency of the one-port acoustic wave resonator 19 is set to be higher than the first maximum frequency and lower than the second minimum frequency.
- the longitudinally coupled elastic wave resonator 18 is connected to the unbalanced terminal 14.
- the one-terminal pair elastic wave resonator 19 is connected in series between the longitudinally coupled elastic wave resonator 18 and the balance terminal 16.
- the low-pass filter 12 further includes a one-terminal acoustic wave resonator 21 connected in series between the longitudinally coupled elastic wave resonator 18 and the balanced terminal 16.
- the high-pass filter 13 includes a longitudinally coupled elastic wave resonator 23, a one-terminal pair elastic wave resonator 24, and a one-terminal pair elastic wave resonator 26.
- the longitudinally coupled elastic wave resonator 23 is connected to the unbalanced terminal 15.
- the one-terminal elastic wave resonator 24 is connected in series between the longitudinally coupled elastic wave resonator 23 and the balance terminal 16.
- the one-terminal elastic wave resonator 26 is connected in series between the longitudinally coupled elastic wave resonator 23 and the balance terminal 17.
- the capacitive element 28 in the high-pass filter or the low-pass filter, the relative bandwidth of the high-pass filter or the low-pass filter can be adjusted.
- elastic wave device 101 in high-pass filter 13, a wire connecting one terminal pair elastic wave resonator 24 and one terminal pair elastic wave resonator 25 and one terminal pair elastic wave resonance.
- a capacitive element 28 is connected between the wire connecting the sensor 26 and the one-terminal-pair elastic wave resonator 27. That is, capacitive element 28 is connected in series with connection points 40 and 41 between connection point 40 and connection point 41 shown in FIG. 1A.
- the capacitive element 28 in the high-pass filter 13 By providing the capacitive element 28 in the high-pass filter 13, the relative bandwidths of the low-pass filter 12 and the high-pass filter 13 formed on the same piezoelectric substrate 11 can be made different. Therefore, it is possible to adjust in the direction to narrow the bandwidth of the high-pass filter 13.
- FIG. 8 is a circuit diagram of another elastic wave device 102 according to the first embodiment.
- the elastic wave device 102 includes a low band side filter 212 and a high band side filter 213 instead of the low band side filter 12 of the elastic wave device 101 and the high band side filter 13.
- the elastic wave device 102 has a capacitive element 128 instead of the capacitive element 28 of the elastic wave device 101.
- the capacitive element 128 is formed of a conductive pattern provided on the piezoelectric substrate 11.
- the one-terminal pair elastic wave resonator 19 and the one-terminal pair elastic wave resonator 20 are connected at a connection point 140.
- One terminal pair elastic wave resonator 21 and one terminal pair elastic wave resonator 22 are connected at connection point 141.
- the capacitive element 128 is connected in series with the connection points 140 and 141 between the connection point 140 and the connection point 141.
- the relative bandwidth of the low pass band PB1 can be made narrower than the relative bandwidth of the high pass band PB2.
- FIG. 9 is a circuit diagram of elastic wave device 103 according to the second embodiment.
- the same components as those of the elastic wave device 101 according to the first embodiment shown in FIG. 1A are denoted by the same reference numerals as those of the elastic wave device 103 according to the second embodiment.
- the elastic wave device 103 according to the second embodiment includes the low-pass filter 312 and the high-pass filter 313 instead of the low-pass filter 12 and the high-pass filter 13 of the elastic wave device 101 according to the first embodiment.
- the elastic wave device 103 according to the second embodiment includes the longitudinally coupled elastic wave resonators 18 and 23 and the balanced terminal 16 in the lower band filter 12 and the higher band filter 13 of the elastic wave device 101 according to the first embodiment.
- the one low-pass filter 312 and the high-pass filter 313 respectively have one one-pair acoustic wave resonators instead. It differs in the point being
- a first one-pair acoustic wave resonator 19 is provided between the longitudinally coupled elastic wave resonator 18 and the balanced terminal 16, and a first one-pair acoustic wave resonator 19 is disposed between the longitudinally coupled elastic wave resonator 18 and the balanced terminal 17.
- Two one-terminal pair elastic wave resonators 21 are provided.
- a third one-port elastic wave resonator 24 is provided between the longitudinally coupled elastic wave resonator 23 and the balanced terminal 16, and a third one-pair acoustic wave resonator 24 is disposed between the longitudinally coupled elastic wave resonator 23 and the balanced terminal 17.
- a four-terminal one-pair elastic wave resonator 26 is provided.
- the antiresonance frequency of at least one of the one-terminal acoustic wave resonators 19 and 21 is set outside the high band of the low band pass band PB1 and outside the low band of the high band pass PB2. That is, the antiresonance frequency of at least one of the one-terminal acoustic wave resonators 19 and 21 is set to a value higher than the maximum frequency of the low pass band PB1 and lower than the minimum frequency of the high pass band PB2. This suppresses the mixing of signals from one filter to the other, and improves the impedance matching in the passband. As a result, the insertion loss can be reduced and the balance can be improved.
- the elastic wave device can suppress the mixing of the signal to the other filter, improve the impedance matching in the pass band, and obtain excellent electrical characteristics, mainly in the mobile communication device. It is useful in an elastic wave device provided with an elastic wave filter and having a common balanced terminal.
- One-Terminal Pair Elastic Wave Resonator (First One-Terminal Pair Elastic Wave Resonator) 20 One-Terminal Pair Elastic Wave Resonator (Fifth One-Terminal Pair Elastic Wave Resonator) 21 One-Terminal Pair Elastic Wave Resonator (Second One-Terminal Pair Elastic Wave Resonator) 22 One-port pair elastic wave resonator (fifth one-port pair elastic wave resonator, sixth one-port pair elastic wave resonator) 23 Longitudinally Coupled Elastic Wave Resonator (Second Longitudinal Coupled Elastic Wave Resonator) 24 One-
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
実施の形態1における弾性波装置101について、図面を参照しながら説明する。
実施の形態2における弾性波装置103について、図面を参照しながら説明する。
13,113,213,313 高域側フィルタ
14 不平衡端子(第1の不平衡端子)
15 不平衡端子(第2の不平衡端子)
16 平衡端子(第1の平衡端子)
17 平衡端子(第2の平衡端子)
18 縦結合型弾性波共振器(第1の縦結合型弾性波共振器)
19 一端子対弾性波共振器(第1の一端子対弾性波共振器)
20 一端子対弾性波共振器(第5の一端子対弾性波共振器)
21 一端子対弾性波共振器(第2の一端子対弾性波共振器)
22 一端子対弾性波共振器(第5の一端子対弾性波共振器、第6の一端子対弾性波共振器)
23 縦結合型弾性波共振器(第2の縦結合型弾性波共振器)
24 一端子対弾性波共振器(第3の一端子対弾性波共振器)
25 一端子対弾性波共振器(第5の一端子対弾性波共振器)
26 一端子対弾性波共振器(第4の一端子対弾性波共振器)
27 一端子対弾性波共振器(第5の一端子対弾性波共振器、第6の一端子対弾性波共振器)
28,128 容量素子
40,140 接続点(第1の接続点)
41,141 接続点(第2の接続点)
Claims (11)
- 第1の不平衡端子に接続され第1の最小周波数から第1の最大周波数までの低域側通過帯域を有する低域側フィルタと、
第2の不平衡端子に接続され前記第1の最大周波数より高い第2の最小周波数から第2の最大周波数までの高域側通過帯域を有する高域側フィルタと、
前記低域側フィルタおよび高域側フィルタに共通に接続された第1と第2の平衡端子と、
を備え、
前記低域側フィルタは、
第1の縦結合型弾性波共振器と、
前記第1の縦結合型弾性波共振器に直列に接続された第1の一端子対弾性波共振器と、
を有し、
前記第1の一端子対弾性波共振器の反共振周波数を、前記第1の最大周波数より高くかつ前記第2の最小周波数より低く設けた、
弾性波装置。 - 前記第1の縦結合型弾性波共振器は前記第1の不平衡端子に接続されており、
前記第1の一端子対弾性波共振器は前記第1の縦結合型弾性波共振器と前記第1の平衡端子との間に接続されており、
前記低域側フィルタは、前記第1の縦結合型弾性波共振器と前記第2の平衡端子との間に接続された第2の一端子対弾性波共振器をさらに有し、
前記高域側フィルタは、
前記第2の不平衡端子に接続された第2の縦結合型弾性波共振器と、
前記第2の縦結合型弾性波共振器と前記第1の平衡端子との間に接続された第3の一端子対弾性波共振器と、
前記第2の縦結合型弾性波共振器と前記第2の平衡端子との間に接続された第4の一端子対弾性波共振器と、
を有し、
前記第1と第2の一端子対弾性波共振器の少なくとも一つの反共振周波数を前記第1の最大周波数より高くかつ前記第2の最小周波数より低く設けた、
請求項1に記載の弾性波装置。 - 前記第3と第4の一端子対弾性波共振器のうち少なくとも一方の共振周波数を前記高域側通過帯域内に設け、前記第3と第4の一端子対弾性波共振器のうち少なくとも一方の反共振周波数を前記第2の最大周波数よりも高くした、
請求項2に記載の弾性波装置。 - 前記低域側フィルタは、前記第1の一端子対弾性波共振器と前記第1の平衡端子との間に接続された第5の一端子対弾性波共振器をさらに有し、
前記第1の一端子対弾性波共振器の反共振周波数と前記第5の一端子対弾性波共振器の反共振周波数との両方を前記第1の最大周波数よりも高くかつ前記第2の最小周波数よりも低くした、
請求項2に記載の弾性波装置。 - 前記第5の一端子対弾性波共振器の反共振周波数を前記第1の一端子対弾性波共振器の反共振周波数よりも高くした、請求項4に記載の弾性波装置。
- 前記低域側フィルタは、前記第2の一端子対弾性波共振器と前記第2の平衡端子との間に接続された第5の一端子対弾性波共振器をさらに有し、
前記第2の一端子対弾性波共振器の反共振周波数と前記第5の一端子対弾性波共振器の反共振周波数との両方を前記第1の最大周波数よりも高くかつ前記第2の最小周波数よりも低くした、
請求項2に記載の弾性波装置。 - 前記第5の一端子対弾性波共振器の反共振周波数を前記第2の一端子対弾性波共振器の反共振周波数よりも高くした、請求項6に記載の弾性波装置。
- 前記高域側フィルタは、前記第3の一端子対弾性波共振器と前記第1の平衡端子との間に接続された第5の一端子対弾性波共振器をさらに有し、
前記第3の一端子対弾性波共振器の反共振周波数を前記第2の最大周波数よりも高くし、
前記第5の一端子対弾性波共振器の反共振周波数を前記第3の一端子対弾性波共振器の反共振周波数よりも高くした、
請求項2に記載の弾性波装置。 - 前記高域側フィルタは、前記第4の一端子対弾性波共振器と前記第2の平衡端子との間に接続された第5の一端子対弾性波共振器をさらに有し、
前記第4の一端子対弾性波共振器の反共振周波数を前記第2の最大周波数よりも高くし、
前記第5の一端子対弾性波共振器の反共振周波数を前記第4の一端子対弾性波共振器の反共振周波数よりも高くした、
請求項2に記載の弾性波装置。 - 前記低域側フィルタは、
前記第1の一端子対弾性波共振器と前記第1の平衡端子との間に接続され、前記第1の一端子対弾性波共振器と第1の接続点で接続された第5の一端子対弾性波共振器と、
前記第2の一端子対弾性波共振器と前記第2の平衡端子との間に接続され、前記第2の一端子対弾性波共振器と第2の接続点で接続された第6の一端子対弾性波共振器と、
前記第1の接続点と前記第2の接続点との間に接続された容量素子と、
をさらに有し、
前記低域側フィルタの比帯域幅を前記高域側フィルタの比帯域幅よりも狭くした、
請求項2に記載の弾性波装置。 - 前記高域側フィルタは、
前記第3の一端子対弾性波共振器と前記第1の平衡端子との間に接続され、前記第3の一端子対弾性波共振器と第1の接続点で接続された第5の一端子対弾性波共振器と、
前記第4の一端子対弾性波共振器と前記第2の平衡端子との間に接続され、前記第4の一端子対弾性波共振器と第2の接続点で接続された第6の一端子対弾性波共振器と、
前記第1の接続点と前記第2の接続点との間に接続された容量素子と、
をさらに有し、
前記高域側フィルタの比帯域幅を前記低域側フィルタの比帯域幅よりも狭くした、
請求項2に記載の弾性波装置。
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US13/878,535 US9154114B2 (en) | 2010-11-09 | 2011-11-07 | Acoustic wave device |
CN201180053296.8A CN103210586B (zh) | 2010-11-09 | 2011-11-07 | 弹性波装置 |
JP2012542804A JP5488714B2 (ja) | 2010-11-09 | 2011-11-07 | 弾性波装置 |
US14/838,543 US9722574B2 (en) | 2010-11-09 | 2015-08-28 | Acoustic wave device |
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US9722574B2 (en) | 2017-08-01 |
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