WO2016067873A1 - 弾性波装置及び弾性波モジュール - Google Patents
弾性波装置及び弾性波モジュール Download PDFInfo
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- WO2016067873A1 WO2016067873A1 PCT/JP2015/078582 JP2015078582W WO2016067873A1 WO 2016067873 A1 WO2016067873 A1 WO 2016067873A1 JP 2015078582 W JP2015078582 W JP 2015078582W WO 2016067873 A1 WO2016067873 A1 WO 2016067873A1
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- filter
- piezoelectric substrate
- elastic wave
- acoustic wave
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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 elements; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6406—Filters characterised by a particular frequency characteristic
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders or supports
- H03H9/0538—Constructional combinations of supports or holders with electromechanical or other electronic elements
- H03H9/0547—Constructional combinations of supports or holders with electromechanical or other electronic elements consisting of a vertical arrangement
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
- H03H9/02—Details
- H03H9/05—Holders or supports
- H03H9/0538—Constructional combinations of supports or holders with electromechanical or other electronic elements
- H03H9/0566—Constructional combinations of supports or holders with electromechanical or other electronic elements for duplexers
- H03H9/0576—Constructional combinations of supports or holders with electromechanical or other electronic elements for duplexers including surface acoustic wave [SAW] 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 elements; 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 elements; Electromechanical resonators
- H03H9/25—Constructional features of resonators using surface acoustic waves
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic elements; 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/181—Printed circuits structurally associated with non-printed electric components associated with surface mounted components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/1006—Non-printed filter
Definitions
- the present invention relates to an elastic wave device such as a band-pass filter and an elastic wave module.
- Patent Document 1 shows an example of an acoustic wave device.
- the elastic wave device of Patent Document 1 has two elastic wave elements.
- an IDT electrode is formed on one main surface of the piezoelectric substrate.
- the two acoustic wave elements are bonded via an intermediate layer so that the principal surfaces of the piezoelectric substrate on which the IDT electrodes are formed face each other.
- External connection terminals are formed on the main surface outside one of the piezoelectric substrates.
- Patent Document 2 In the elastic wave device described in Patent Document 2 below, two elastic wave elements are joined as in Patent Document 1.
- the thickness of the piezoelectric substrate of each acoustic wave element is different.
- External connection terminals are formed on the outer main surface of the piezoelectric substrate having a smaller thickness.
- Patent Documents 1 and 2 the piezoelectric substrates are bonded to each other through an intermediate layer. Therefore, the distance between the acoustic wave element on which no external connection terminal is formed and the external connection terminal is large. Therefore, the ground impedance of the acoustic wave device was large. Therefore, the out-of-band attenuation of the acoustic wave device cannot be increased sufficiently.
- An object of the present invention is to provide an elastic wave device and an elastic wave module having a large out-of-band attenuation.
- An elastic wave device includes a first piezoelectric substrate having first and second main surfaces, a first piezoelectric substrate having first and second main surfaces, and a thickness greater than the thickness of the first piezoelectric substrate.
- a first piezoelectric substrate having first and second main surfaces
- a first piezoelectric substrate having first and second main surfaces
- a thickness greater than the thickness of the first piezoelectric substrate On the first main surface of the second piezoelectric substrate and the plurality of first IDT electrodes formed on the first main surface of the first piezoelectric substrate
- a first acoustic wave filter including the plurality of first IDT electrodes is formed on the first main surface, and the plurality of second IDTs are formed on the first main surface of the second piezoelectric substrate.
- a second elastic wave filter including an electrode, wherein at least one of the plurality of external connection terminals is grounded;
- the first piezoelectric substrate and the second piezoelectric substrate so that the first main surface of the first piezoelectric substrate and the first main surface of the second piezoelectric substrate face each other.
- a piezoelectric substrate is joined via a support member, and the support member is provided so as to surround a portion where the first and second elastic wave filters are configured in a plan view.
- the out-of-band attenuation of the elastic wave filter is larger than the out-of-band attenuation of the second elastic wave filter.
- the out-of-band attenuation in the frequency band in the range of 0.85 times or more and 1.15 times or less of the center frequency of the pass band of the first elastic wave filter is larger than the out-of-band attenuation in the frequency band in the range of 0.85 times to 1.15 times the center frequency of the passband of the second elastic wave filter.
- the ground impedance in the first elastic wave filter having a large out-of-band attenuation in the range can be reduced. As a result, the out-of-band attenuation can be increased.
- the first elastic wave filter includes a first longitudinally coupled resonator type elastic wave filter
- the second elastic wave filter includes a second vertical wave filter. It has a coupled resonator type acoustic wave filter, and the number of stages of the first longitudinally coupled resonator type acoustic wave filter is larger than the number of stages of the second longitudinally coupled resonator type acoustic wave filter. In this case, the out-of-band attenuation can be effectively increased.
- the first elastic wave filter has a first ladder filter
- the second elastic wave filter has a second ladder filter.
- the number of elastic wave resonators included in the first ladder type filter is larger than the number of elastic wave resonators included in the second ladder type filter. In this case, the out-of-band attenuation can be effectively increased.
- a first duplexer is formed on the first main surface of the first piezoelectric substrate, and the first duplexer is configured to be the first elastic member.
- a second duplexer is configured on the main surface, and the second duplexer has a third bandpass filter as the second elastic wave filter, and a different passband from the third bandpass filter.
- a fourth band-pass filter, and an attenuation amount in a frequency band corresponding to a pass band of the second band-pass filter of the first band-pass filter is the third band-pass filter.
- the ground impedance of the first band-pass filter having a large attenuation in the frequency band can be reduced. Accordingly, it is possible to effectively increase the isolation characteristics of the quadplexer constituted by the first and second duplexers.
- a first connection wiring that electrically connects the ground terminal and the first acoustic wave filter, the ground terminal, and the second And a second connection wiring that is electrically connected to the elastic wave filter, and the length of the first connection wiring is shorter than the length of the second connection wiring.
- the ground impedance of the first elastic wave filter can be reduced. Accordingly, the out-of-band attenuation can be effectively increased.
- the elastic wave module according to the present invention includes a mounting substrate and an elastic wave device configured according to the present invention mounted on the mounting substrate. Thereby, the out-of-band attenuation can be effectively increased.
- FIG. 1 is a plan view of an acoustic wave device according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along line AA in FIG.
- FIG. 3A and FIG. 3B are a circuit diagram of a first elastic wave filter and a circuit diagram of a second elastic wave filter in the first embodiment of the present invention.
- 4 is a cross-sectional view taken along line BB in FIG.
- FIG. 5 is a cross-sectional view taken along the line CC in FIG.
- FIG. 6 is a diagram showing attenuation frequency characteristics of the first elastic wave filter in the first embodiment of the present invention and the first comparative example.
- FIG. 1 is a plan view of an acoustic wave device according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along line AA in FIG.
- FIG. 3A and FIG. 3B are a circuit diagram of a first elastic wave filter and a circuit diagram of a second
- FIG. 7 is a diagram showing attenuation frequency characteristics of the second elastic wave filter in the first embodiment of the present invention and the first comparative example.
- FIG. 8 is a cross-sectional plan view showing the electrode configuration on the first main surface of the first piezoelectric substrate in the second embodiment of the present invention.
- FIG. 9 is a plan sectional view showing an electrode configuration on the first main surface of the second piezoelectric substrate in the second embodiment of the present invention.
- FIGS. 10 (a) to 10 (d) are circuit diagrams of first to fourth band-pass filters according to the second embodiment of the present invention.
- FIG. 11 is a diagram showing attenuation frequency characteristics of the first band-pass filter in the second embodiment and the second comparative example of the present invention.
- FIG. 12 is a diagram illustrating the attenuation frequency characteristics of the third band-pass filter in the second embodiment and the second comparative example of the present invention.
- FIGS. 13A to 13D are circuit diagrams of first to fourth band-pass filters in the third embodiment.
- FIG. 14 is a front sectional view of an elastic wave module as a fourth embodiment of the present invention.
- FIG. 1 is a plan view of an acoustic wave device according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along line AA in FIG.
- the acoustic wave device 1 includes first and second acoustic wave elements 11A and 11B.
- the first acoustic wave element 11A has a first piezoelectric substrate 2A.
- the first piezoelectric substrate 2A has a first main surface 2Aa and a second main surface 2Ab facing the first main surface 2Aa.
- the second acoustic wave element 11B has a second piezoelectric substrate 2B.
- the second piezoelectric substrate 2B has first and second main surfaces 2Ba and 2Bb.
- the thickness of the first piezoelectric substrate 2A is smaller than the thickness of the second piezoelectric substrate 2B.
- the first and second piezoelectric substrates 2A and 2B are made of a piezoelectric single crystal such as LiTaO 3 or LiNbO 3 .
- the first and second piezoelectric substrates 2A and 2B may be made of piezoelectric ceramics.
- a plurality of first IDT electrodes 3A11 are formed on the first main surface 2Aa of the first piezoelectric substrate 2A.
- a surface acoustic wave is excited by applying an AC voltage to the IDT electrode.
- reflectors are respectively formed on both sides of each first IDT electrode 3A11 in the surface acoustic wave propagation direction.
- a plurality of elastic wave resonators are formed.
- the plurality of acoustic wave resonators are connected so as to constitute a ladder filter, as will be described later.
- the first elastic wave filter is configured.
- a plurality of second IDT electrodes 3B11 are formed on the first main surface 2Ba of the second piezoelectric substrate 2B.
- a plurality of acoustic wave resonators are configured by the plurality of second IDT electrodes 3B11 and the plurality of reflectors.
- the plurality of acoustic wave resonators are connected to each other to constitute a second acoustic wave filter.
- the first and second IDT electrodes 3A11 and 3B11 are made of metal.
- the IDT electrode may be composed of a single metal film or a laminate in which a plurality of metal films are laminated.
- the out-of-band attenuation of the first elastic wave filter is larger than the out-of-band attenuation of the second elastic wave filter.
- the first piezoelectric substrate 2A and the second piezoelectric substrate 2B are arranged such that the first main surface 2Aa of the first piezoelectric substrate 2A and the first main surface 2Ba of the second piezoelectric substrate 2B face each other. It is joined via the support member 4.
- the support member 4 is provided so as to surround a portion where the first and second elastic wave filters are configured in plan view.
- the support member 4 is made of an appropriate resin or solder.
- a plurality of external connection terminals 5 are formed on the second main surface 2Ab of the first piezoelectric substrate 2A.
- the plurality of external connection terminals 5 include ground terminals 5a and 5b.
- via-hole electrodes 6a and 6b are formed so as to penetrate the first piezoelectric substrate 2A.
- the upper ends of the via-hole electrodes 6a and 6b are electrically connected to the ground terminals 5a and 5b, respectively.
- the lower end portions of the via-hole electrodes 6a and 6b are electrically connected to connection terminals 7Aa and 7Ab formed on the first main surface 2Aa of the first piezoelectric substrate 2A, respectively.
- the connection terminals 7Aa and 7Ab are electrically connected to the first acoustic wave filter.
- Connection terminals 7Ba and 7Bb are formed on the first main surface 2Ba of the second piezoelectric substrate 2B. Although not shown in FIG. 2, the connection terminals 7Ba and 7Bb are electrically connected to the second acoustic wave filter.
- the connection terminal 7Ba is electrically connected to the connection terminal 7Aa through the connection wiring 8a.
- the connection terminal 7Bb is electrically connected to the connection terminal 7Ab via the connection wiring 8b.
- the wiring connecting the first acoustic wave filter and the ground potential is defined as the first connection wiring.
- a wiring connecting the second acoustic wave filter and the ground potential is defined as a second connection wiring.
- the connection terminal 7Aa, the via-hole electrode 6a, and the ground terminal 5a are the first connection wiring.
- the connection terminal 7Ab, the via hole electrode 6b, and the ground terminal 5b are also the first connection wiring.
- the connection terminal 7Ba, the connection wiring 8a, the connection terminal 7Aa, the via hole electrode 6a, and the ground terminal 5a are the second connection wiring.
- the connection terminal 7Bb, the connection wiring 8b, the connection terminal 7Ab, the via hole electrode 6b, and the ground terminal 5b are also the second connection wiring.
- the first and second acoustic wave filters are commonly connected to the ground potential.
- the first connection wiring does not include the connection terminal 7Ba, the connection wiring 8a, the connection terminal 7Bb, and the connection wiring 8b. Therefore, the length of the first connection wiring is shorter than the length of the second connection wiring.
- FIG. 3A is a circuit diagram of the first acoustic wave filter in the first embodiment
- FIG. 3B is a circuit diagram of the second acoustic wave filter.
- the first elastic wave filter 3A1 is a ladder type filter.
- the first acoustic wave filter 3A1 includes series arm resonators S1 to S5 connected between the input terminal 9Aa and the output terminal 9Ab.
- a parallel arm resonator P1 is connected between a connection point between the series arm resonator S1 and the series arm resonator S2 and the ground potential.
- a parallel arm resonator P2 is connected between a connection point between the series arm resonator S2 and the series arm resonator S3 and the ground potential.
- a parallel arm resonator P3 is connected between a connection point between the series arm resonator S3 and the series arm resonator S4 and the ground potential.
- a parallel arm resonator P4 is connected between a connection point between the series arm resonator S4 and the series arm resonator S5 and the ground potential.
- the second acoustic wave filter 3B1 is a ladder filter having a circuit configuration similar to that of the first acoustic wave filter 3A1, and includes an input terminal 9Ba, an output terminal 9Bb, series arm resonators S11 to S15, and parallel arm resonators P11 to P11. P14.
- FIG. 4 is a cross-sectional view taken along the line BB in FIG. 2 and shows the electrode configuration of the first acoustic wave filter in the first embodiment.
- FIG. 5 is a cross-sectional view taken along the line CC in FIG. 2, and shows the electrode configuration of the second acoustic wave filter in the first embodiment.
- each acoustic wave resonator has an IDT electrode and a reflector.
- Each elastic wave resonator is indicated by a schematic symbol in which X is surrounded by a rectangular frame.
- the parallel arm resonators P1 and P3 are electrically connected to the connection terminal 7Ab.
- the parallel arm resonators P2 and P4 are electrically connected to the connection terminal 7Aa.
- the parallel arm resonators P11 and P13 are electrically connected to the connection terminal 7Ba.
- the parallel arm resonators P12 and P14 are electrically connected to the connection terminal 7Bb.
- the parallel arm resonators P1, P3, P12, and P14 are commonly connected to the ground potential via connection terminals 7Ab and 7Bb.
- the parallel arm resonators P2, P4, P11, and P13 are commonly connected to the ground potential via connection terminals 7Aa and 7Ba.
- a feature of the present invention is that the first acoustic wave filter 3A1 is connected to the ground potential via the first connection wiring having a relatively short length, and is out of the band of the first acoustic wave filter 3A1.
- the attenuation is larger than the out-of-band attenuation of the second elastic wave filter 3B1.
- the out-of-band attenuation of the acoustic wave device 1 can be effectively increased. This will be described below.
- the inventor of the present invention manufactured the elastic wave device of the first embodiment and the first comparative example, and examined the out-of-band attenuation.
- the elastic wave device of the first comparative example has the same configuration as that of the first embodiment except for the arrangement of the first and second elastic wave filters. More specifically, a second acoustic wave filter is configured on the first main surface of the first piezoelectric substrate of the first acoustic wave element. A first acoustic wave filter is configured on the first main surface of the second piezoelectric substrate of the second acoustic wave element.
- the pass band of the first elastic wave filter is 2400 MHz or more and 2482 MHz or less.
- the pass band of the second elastic wave filter is not less than 1559 MHz and not more than 1608 MHz.
- FIG. 6 is a diagram showing attenuation frequency characteristics of the first elastic wave filter in the first embodiment and the first comparative example.
- FIG. 7 is a diagram illustrating attenuation frequency characteristics of the second elastic wave filter in the first embodiment and the first comparative example. A solid line shows the result of the first embodiment, and a broken line shows the result of the first comparative example.
- the out-of-band attenuation at the frequency D of the first elastic wave filter of the present embodiment is 53.3 dB
- the out-of-band attenuation at the frequency D of the first comparative example is 50.5 dB. is there. Therefore, it can be seen that in this embodiment, the out-of-band attenuation is increased by 2.8 dB compared to the first comparative example. The reason for this will be described below.
- the wiring connecting the ground potential and the acoustic wave filter has a ground impedance.
- the longer the wiring length the greater the ground impedance.
- the first acoustic wave filter of this embodiment and the ground potential are connected via the first connection wiring.
- the first acoustic wave filter of the first comparative example and the ground potential are connected via the second connection wiring.
- the length of the first connection wiring is shorter than the length of the second connection wiring. Therefore, the ground impedance of the first connection wiring is smaller than the ground impedance of the second connection wiring. Therefore, the out-of-band attenuation of the first elastic wave filter of this embodiment can be increased.
- the out-of-band attenuation at the frequency E of the second elastic wave filter of the present embodiment is 48.2 dB, and the out-of-band at the frequency E of the second elastic wave filter of the first comparative example.
- the attenuation is 49.4 dB.
- the out-of-band attenuation at the frequency E of the second elastic wave filter of the present embodiment is small.
- the decrease is only 1.2 dB, which is smaller than the increase in the out-of-band attenuation of the first elastic wave filter.
- the out-of-band attenuation of the second elastic wave filter can be effectively increased. Therefore, it can be seen that the out-of-band attenuation as the entire acoustic wave device can be effectively increased.
- the maximum value of the out-of-band attenuation in the frequency band in the range of 0.85 times or more and 1.15 times or less of the center frequency of the passband of the first elastic wave filter is the pass of the second elastic wave filter It is desirable that it is larger than the out-of-band attenuation in the frequency band in the range of 0.85 times to 1.15 times the center frequency of the band. Thereby, the out-of-band attenuation amount as the entire elastic wave device can be effectively increased.
- FIG. 8 is a plan sectional view showing an electrode configuration on the first main surface of the first piezoelectric substrate in the second embodiment of the present invention.
- FIG. 9 is a plan sectional view showing an electrode configuration on the first main surface of the second piezoelectric substrate in the second embodiment.
- the elastic wave device 21 of the second embodiment has the same structure as that of the first embodiment except that the circuit configuration is different from that of the first embodiment.
- a first duplexer 23 ⁇ / b> A is configured on the first main surface 2 ⁇ / b> Aa of the first piezoelectric substrate 2 ⁇ / b> A in the first elastic wave element 31 ⁇ / b> A of the elastic wave device 21.
- the first duplexer 23A includes a first band-pass filter 23A1 as a first elastic wave filter and a second band-pass filter 23A2 having a different pass band from the first band-pass filter 23A1.
- a second duplexer 23B is configured on the first main surface 2Ba of the second piezoelectric substrate 2B in the second acoustic wave element 31B.
- the second duplexer 23B includes a third bandpass filter 23B1 and a fourth bandpass filter 23B2, which is a different passband from the third bandpass filter 23B1. That is, the acoustic wave device 21 is a quadplexer having first to fourth band-pass filters 23A1, 23A2, 23B1, and 23B2.
- the first and third band pass filters 23A1 and 23B1 are reception filters
- the second and fourth band pass filters 23A2 and 23B2 are transmission filters.
- 10 (a) to 10 (d) are circuit diagrams of first to fourth band-pass filters in the second embodiment.
- the first band-pass filter 23A1 has a longitudinally coupled resonator type acoustic wave filter 30A.
- Series arm resonators S21 and S22 are connected between the input terminal 29Aa and the longitudinally coupled resonator type acoustic wave filter 30A.
- a parallel arm resonator P21 is connected between the connection point between the series arm resonator S21 and the series arm resonator S22 and the ground potential.
- a parallel arm resonator P22 is connected between a connection point between the longitudinally coupled resonator type acoustic wave filter 30A and the output terminal 29Ac and the ground potential.
- the second bandpass filter 23A2 has series arm resonators S31 to S35 connected between the input terminal 29Aa and the output terminal 29Ab.
- a parallel arm resonator P31 is connected between a connection point between the series arm resonator S31 and the series arm resonator S32 and the ground potential.
- a parallel arm resonator P32 is connected between a connection point between the series arm resonator S32 and the series arm resonator S33 and the ground potential.
- a parallel arm resonator P33 is connected between the connection point between the series arm resonator S33 and the series arm resonator S34 and the ground potential.
- a parallel arm resonator P34 is connected between a connection point between the series arm resonator S34 and the series arm resonator S35 and the ground potential.
- the third bandpass filter 23B1 has a longitudinally coupled resonator type acoustic wave filter 30B.
- a series arm resonator S41 is connected between the input terminal 29Ba and the longitudinally coupled resonator type acoustic wave filter 30B.
- a parallel arm resonator P41 is connected between a connection point between the longitudinally coupled resonator type acoustic wave filter 30B and the output terminal 29Bc and the ground potential.
- the fourth band-pass filter 23B2 includes series arm resonators S51 to S53 connected between the input terminal 29Ba and the output terminal 29Bb.
- a parallel arm resonator P51 is connected between a connection point between the input terminal 29Ba and the series arm resonator S51 and the ground potential.
- a parallel arm resonator P52 is connected between the connection point between the series arm resonator S51 and the series arm resonator S52 and the ground potential.
- a parallel arm resonator P53 is connected between a connection point between the series arm resonator S52 and the series arm resonator S53 and the ground potential.
- the parallel arm resonators P21 and P22 are electrically connected to the connection terminal 27Ac.
- the parallel arm resonators P31 and P33 are electrically connected to the connection terminal 27Aa.
- the parallel arm resonators P32 and P34 are electrically connected to the connection terminal 27Ab.
- the parallel arm resonator P41 is electrically connected to the connection terminal 27Bc.
- the parallel arm resonators P51 and P53 are electrically connected to the connection terminal 27Ba.
- the parallel arm resonator P52 is electrically connected to the connection terminal 27Bb.
- the parallel arm resonators P21, P22, and P41 are commonly connected to the ground potential via connection terminals 27Ac and 27Bc.
- the parallel arm resonators P31, P33, P51, and P53 are commonly connected to the ground potential via connection terminals 27Aa and 27Ba.
- the parallel arm resonators P32, P34, and P52 are commonly connected to the ground potential via connection terminals 27Ab and 27Bb.
- the inventor of the present invention manufactured the acoustic wave device in the second embodiment and the second comparative example, and examined the out-of-band attenuation. More specifically, the amount of attenuation in the frequency band corresponding to the pass band of the second band pass filter of the first band pass filter was examined. The attenuation amount of the frequency band corresponding to the pass band of the fourth band pass filter of the third band pass filter was evaluated.
- the second comparative example has the same structure as that of the second embodiment except that the arrangement of the first to fourth band-pass filters is different. More specifically, the first and second band-pass filters are configured on the first main surface of the second piezoelectric substrate. The third and fourth band-pass filters are configured on the first main surface of the first piezoelectric substrate.
- the pass band of the first band pass filter is 2110 MHz or more and 2170 MHz or less.
- the pass band of the second band pass filter is 1920 MHz or more and 1980 MHz or less.
- the pass band of the third band pass filter is 1805 MHz or more and 1880 MHz or less.
- the pass band of the fourth band pass filter is not less than 1710 MHz and not more than 1785 MHz.
- FIG. 11 is a diagram showing attenuation frequency characteristics of the first band-pass filter in the second embodiment and the second comparative example.
- FIG. 12 is a diagram illustrating the attenuation frequency characteristics of the third band-pass filter in the second embodiment and the second comparative example. A solid line shows the result of the second embodiment, and a broken line shows the result of the second comparative example.
- the attenuation amount of the frequency band corresponding to the pass band of the second band pass filter of the first band pass filter in the present embodiment is 53.6 dB.
- the attenuation amount of the frequency band corresponding to the pass band of the second band pass filter of the first band pass filter in the second comparative example is 51.6 dB. Therefore, it can be understood that the attenuation amount is increased by 2.0 dB in the present embodiment as compared with the second comparative example.
- the attenuation amount of the frequency band corresponding to the pass band of the fourth band pass filter of the third band pass filter in the present embodiment is 48.0 dB.
- the attenuation amount of the frequency band corresponding to the pass band of the fourth band-pass filter of the third band-pass filter in the second comparative example is 49.2 dB.
- the attenuation amount of the third band-pass filter is smaller than that of the second comparative example, but the decrease of the attenuation amount is only 1.2 dB.
- the decrease in the attenuation amount of the third band-pass filter is smaller than the increase in the attenuation amount in the first band-pass filter.
- the number of elastic wave resonators included in the first bandpass filter 23A1 is larger than the number of elastic wave resonators included in the third bandpass filter 23B1.
- the out-of-band attenuation of the first bandpass filter 23A1 is larger than the out-of-band attenuation of the third bandpass filter 23B1.
- the ground impedance of the first band-pass filter 23A1 having a large out-of-band attenuation can be reduced. Accordingly, it is possible to effectively suppress the decrease in the out-of-band attenuation as the entire acoustic wave device 21.
- FIGS. 13A to 13D are circuit diagrams of first to fourth band-pass filters in the third embodiment.
- the third band-pass filter 23B1 in the second embodiment shown in FIG. 10 is used as the third band-pass filter 43B1. Furthermore, the arrangement of the first to fourth band-pass filters 23A1, 23A2, 43B1, 23B2 is different from that of the second embodiment. Except for the above configuration, the configuration is the same as that of the second embodiment.
- the first and second band-pass filters 23A1 and 23A2 are configured on the first main surface of the second piezoelectric substrate.
- the third and fourth band-pass filters 43B1 and 23B2 are configured on the first main surface of the first piezoelectric substrate having a thickness smaller than that of the second piezoelectric substrate.
- the longitudinally coupled resonator type elastic wave filter 50B of the third band pass filter 43B1 is configured in two stages. That is, the number of stages of the longitudinally coupled resonator type acoustic wave filter 50B is larger than the number of stages of the longitudinally coupled resonator type acoustic wave filter 30A of the first bandpass filter 23A1.
- the out-of-band attenuation of the third bandpass filter 43B1 is larger than the out-of-band attenuation of the first bandpass filter 23A1.
- the third band-pass filter 43B1 since the third band-pass filter 43B1 is configured on the first piezoelectric substrate, it is possible to suppress a decrease in out-of-band attenuation of the third band-pass filter 43B1. Accordingly, it is possible to effectively increase the out-of-band attenuation as the entire acoustic wave device.
- the longitudinally coupled resonator type acoustic wave filters 30A and 50B are composed of one stage and two stages, but the number of stages is not limited thereto.
- a band pass filter having a large number of stages of longitudinally coupled resonator type acoustic wave filters may be configured on the first main surface of the first piezoelectric substrate having a thickness smaller than that of the second piezoelectric substrate.
- FIG. 14 is a front cross-sectional view of an elastic wave module as a fourth embodiment.
- the elastic wave module 61 has a mounting substrate 62.
- the acoustic wave device 1 according to the first embodiment is mounted on the mounting substrate 62. More specifically, mounting terminals 65 a and 65 b are formed on the mounting substrate 62.
- the ground terminals 5a and 5b of the acoustic wave device 1 are bonded to the mounting terminals 65a and 65b via bonding agents 68a and 68b made of solder or the like.
- the plurality of external connection terminals other than the ground terminal of the acoustic wave device 1 are also joined to the plurality of mounting terminals of the mounting substrate 62.
- a device 63 is also mounted on the elastic wave module 61. As described above, devices and elements other than the acoustic wave device 1 may be mounted on the acoustic wave module 61. Since the elastic wave module 61 includes the mounted elastic wave device 1, the out-of-band attenuation can be effectively increased.
- mounting substrate 63 devices 65a and 65b ... mounting terminals 68a and 68b ... bonding agents S1 to S5, S11 to S15, S21, S22, S31 to S35, S41, S51 S53: Series arm resonators P1 to P4, P11 to P14, P21, P22, P31 to P34, P41, P51 to P53 ... Parallel arm resonators
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
2A,2B…第1,第2の圧電基板
2Aa,2Ab…第1,第2の主面
2Ba,2Bb…第1,第2の主面
3A1,3B1…第1,第2の弾性波フィルタ
3A11,3B11…第1,第2のIDT電極
4…支持部材
5…外部接続用端子
5a,5b…グラウンド端子
6a,6b…ビアホール電極
7Aa,7Ab,7Ba,7Bb…接続用端子
8a,8b…接続用配線
9Aa,9Ba…入力端子
9Ab,9Bb…出力端子
10…縦結合共振子型弾性波フィルタ
11A,11B…第1,第2の弾性波素子
21…弾性波装置
23A,23B…第1,第2のデュプレクサ
23A1,23A2,23B1,23B2…第1,第2,第3,第4の帯域通過型フィルタ
27Aa,27Ab,27Ba,27Bb,27Ac,27Bc…接続用端子
29Aa,29Ba…入力端子
29Ab,29Bb…出力端子
30A,30B…縦結合共振子型弾性波フィルタ
31A,31B…第1,第2の弾性波素子
43B1…第3の帯域通過型フィルタ
50B…縦結合共振子型弾性波フィルタ
61…弾性波モジュール
62…実装基板
63…装置
65a,65b…実装用端子
68a,68b…接合剤
S1~S5,S11~S15,S21,S22,S31~S35,S41,S51~S53…直列腕共振子
P1~P4,P11~P14,P21,P22,P31~P34,P41,P51~P53…並列腕共振子
Claims (7)
- 第1,第2の主面を有する第1の圧電基板と、
第1,第2の主面を有し、かつ前記第1の圧電基板の厚みよりも厚みが大きい第2の圧電基板と、
前記第1の圧電基板の前記第1の主面上に形成されている複数の第1のIDT電極及び前記第2の圧電基板の前記第1の主面上に形成されている複数の第2のIDT電極と、
前記第1の圧電基板の前記第2の主面上に形成されている複数の外部接続用端子とを備え、
前記第1の圧電基板の前記第1の主面に前記複数の第1のIDT電極を含む第1の弾性波フィルタが構成されており、前記第2の圧電基板の前記第1の主面に前記複数の第2のIDT電極を含む第2の弾性波フィルタが構成されており、前記複数の外部接続用端子のうちの少なくとも1つがグラウンド端子であり、前記第1の圧電基板の前記第1の主面と前記第2の圧電基板の前記第1の主面とが対向し合うように、前記第1の圧電基板と前記第2の圧電基板とが支持部材を介して接合されており、前記支持部材が平面視において前記第1,第2の弾性波フィルタが構成されている部分を囲むように設けられており、前記第1の弾性波フィルタの帯域外減衰量が前記第2の弾性波フィルタの帯域外減衰量よりも大きい、弾性波装置。 - 前記第1の弾性波フィルタの通過帯域の中心周波数の0.85倍以上、1.15倍以下の範囲の周波数帯域における帯域外減衰量の最大値が前記第2の弾性波フィルタの通過帯域の中心周波数の0.85倍以上、1.15倍以下の範囲の周波数帯域における帯域外減衰量よりも大きい、請求項1に記載の弾性波装置。
- 前記第1の弾性波フィルタが第1の縦結合共振子型弾性波フィルタを有し、前記第2の弾性波フィルタが第2の縦結合共振子型弾性波フィルタを有し、前記第1の縦結合共振子型弾性波フィルタの段数が前記第2の縦結合共振子型弾性波フィルタの段数よりも大きい、請求項1に記載の弾性波装置。
- 前記第1の弾性波フィルタが第1のラダー型フィルタを有し、前記第2の弾性波フィルタが第2のラダー型フィルタを有し、前記第1のラダー型フィルタが有する弾性波共振子の個数が、前記第2のラダー型フィルタが有する弾性波共振子の個数よりも大きい、請求項1に記載の弾性波装置。
- 前記第1の圧電基板の前記第1の主面に第1のデュプレクサが構成されており、前記第1のデュプレクサが前記第1の弾性波フィルタとしての第1の帯域通過型フィルタと、前記第1の帯域通過型フィルタと異なる通過帯域である第2の帯域通過型フィルタとを有し、前記第2の圧電基板の前記第1の主面に第2のデュプレクサが構成されており、前記第2のデュプレクサが前記第2の弾性波フィルタとしての第3の帯域通過型フィルタと、前記第3の帯域通過型フィルタと異なる通過帯域である第4の帯域通過型フィルタとを有し、前記第1の帯域通過型フィルタの前記第2の帯域通過型フィルタの通過帯域に相当する周波数帯域における減衰量が、前記第3の帯域通過型フィルタの前記第4の帯域通過型フィルタの通過帯域に相当する周波数帯域における減衰量よりも大きい、請求項1に記載の弾性波装置。
- 前記グラウンド端子と前記第1の弾性波フィルタとを電気的に接続している第1の接続配線と、
前記グラウンド端子と前記第2の弾性波フィルタとを電気的に接続している第2の接続配線とをさらに備え、
前記第1の接続配線の長さが前記第2の接続配線の長さよりも短い、請求項1~5のいずれか1項に記載の弾性波装置。 - 実装基板と、
前記実装基板上に実装されている請求項1~6のいずれか1項に記載の弾性波装置とを備える、弾性波モジュール。
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| DE112015004917.7T DE112015004917T5 (de) | 2014-10-31 | 2015-10-08 | Vorrichtung für elastische Wellen und Modul für elastische Wellen |
| CN201580058298.4A CN107078716B (zh) | 2014-10-31 | 2015-10-08 | 弹性波装置以及弹性波模块 |
| JP2016533739A JP5983907B1 (ja) | 2014-10-31 | 2015-10-08 | 弾性波装置及び弾性波モジュール |
| US15/493,165 US10171064B2 (en) | 2014-10-31 | 2017-04-21 | Elastic wave device and elastic wave module |
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| US20190245516A1 (en) * | 2016-11-08 | 2019-08-08 | Murata Manufacturing Co., Ltd. | Acoustic wave filter device and multiplexer |
| KR20200072526A (ko) * | 2017-12-25 | 2020-06-22 | 가부시키가이샤 무라타 세이사쿠쇼 | 멀티플렉서 |
| JP2020155967A (ja) * | 2019-03-20 | 2020-09-24 | 太陽誘電株式会社 | フィルタおよびマルチプレクサ |
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| JP6848986B2 (ja) * | 2016-12-26 | 2021-03-24 | 株式会社村田製作所 | 弾性波装置、高周波フロントエンドモジュールおよび通信装置 |
| JP7093694B2 (ja) * | 2018-07-17 | 2022-06-30 | 太陽誘電株式会社 | 通信用モジュール |
| US11581870B2 (en) * | 2019-09-27 | 2023-02-14 | Skyworks Solutions, Inc. | Stacked acoustic wave resonator package with laser-drilled VIAS |
| WO2021187537A1 (ja) * | 2020-03-18 | 2021-09-23 | 株式会社村田製作所 | 弾性波装置 |
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| JP5983907B1 (ja) | 2016-09-06 |
| DE112015004917T5 (de) | 2017-07-13 |
| JPWO2016067873A1 (ja) | 2017-04-27 |
| CN107078716B (zh) | 2020-07-14 |
| US20170222625A1 (en) | 2017-08-03 |
| US10171064B2 (en) | 2019-01-01 |
| CN107078716A (zh) | 2017-08-18 |
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