WO2019124127A1 - 弾性波装置、高周波フロントエンド回路及び通信装置 - Google Patents
弾性波装置、高周波フロントエンド回路及び通信装置 Download PDFInfo
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- WO2019124127A1 WO2019124127A1 PCT/JP2018/045214 JP2018045214W WO2019124127A1 WO 2019124127 A1 WO2019124127 A1 WO 2019124127A1 JP 2018045214 W JP2018045214 W JP 2018045214W WO 2019124127 A1 WO2019124127 A1 WO 2019124127A1
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- silicon
- elastic wave
- wave device
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Images
Classifications
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- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
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- H03H9/02543—Characteristics of substrate, e.g. cutting angles
- H03H9/02574—Characteristics of substrate, e.g. cutting angles of combined substrates, multilayered substrates, piezoelectrical layers on not-piezoelectrical substrate
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- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
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- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
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- H03F2203/7209—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched from a first band to a second band
Definitions
- the present invention relates to an elastic wave device having a silicon supporting substrate and a silicon cover layer, a high frequency front end circuit, and a communication device.
- Patent Document 1 discloses an elastic wave device having a package structure in which a hollow space is provided.
- a functional electrode is provided on a silicon substrate.
- An adhesive layer is provided on the silicon substrate so as to surround the functional electrode. Then, the sealing member made of silicon is joined by the adhesive layer so as to face the silicon substrate. The functional electrode is thereby located in the hollow space formed.
- An object of the present invention is to provide an elastic wave device, a high frequency front end circuit, and a communication device, which are less likely to cause electrostatic breakdown due to charging.
- a silicon supporting substrate a piezoelectric body directly or indirectly laminated on the silicon supporting substrate, a functional electrode provided on the piezoelectric body, and a direct or indirect lamination on the silicon supporting substrate
- a support layer made of an insulator, and a silicon cover layer laminated on the support layer, provided on the outer side of the functional electrode in plan view, and the silicon support substrate A space surrounded by the support layer and the silicon cover layer is formed, and the electrical resistance of the silicon support substrate is higher than the electrical resistance of the silicon cover layer.
- a high frequency front end circuit according to the present invention comprises an elastic wave device configured according to the present invention and a power amplifier.
- a communication device comprises a high frequency front end circuit configured according to the present invention and an RF signal processing circuit.
- an elastic wave device it is possible to provide an elastic wave device, a high frequency front end circuit, and a communication device in which electrostatic breakdown of functional electrodes is less likely to occur.
- FIG. 1 is a front cross-sectional view of an elastic wave device according to a first embodiment of the present invention.
- FIG. 2 is a front cross-sectional view of an elastic wave device according to a second embodiment of the present invention.
- FIG. 3 is a front sectional view of an elastic wave device according to a third embodiment of the present invention.
- FIG. 4 is a front sectional view of an elastic wave device according to a fourth embodiment of the present invention.
- FIG. 5 is a block diagram of a communication device having a high frequency front end circuit.
- FIG. 1 is a front cross-sectional view of an elastic wave device according to a first embodiment of the present invention.
- the elastic wave device 1 has a silicon support substrate 2.
- a support layer 3 made of resin is provided on a silicon support substrate 2.
- the support layer 3 has a frame shape in plan view.
- a silicon cover layer 4 is provided on the support layer 3 so as to seal the upper opening of the support layer 3.
- the low sound velocity film 5 is stacked on the silicon support substrate 2.
- the piezoelectric body 6 is stacked on the low sound velocity film 5.
- An IDT electrode 7 as a functional electrode is provided on the piezoelectric body 6. Therefore, the piezoelectric body 6 is disposed in a portion surrounded by the support layer 3.
- the thickness of the piezoelectric body 6 is 3.5 ⁇ or less.
- the support layer 3 is provided directly on the silicon support substrate 2, and the support layer 3 is not located on the piezoelectric body 6. Therefore, the piezoelectric body 6 is less likely to be damaged by the stress of the support layer 3 in the manufacturing process and at the time of use.
- Connection electrodes 8 and 9 are provided to be electrically connected to the IDT electrode 7.
- a dielectric film 10 is provided to cover the IDT electrode 7.
- the upper ends of the through via electrodes 11 and 12 are connected to the connection electrodes 8 and 9.
- the through via electrodes 11 and 12 are provided to penetrate the silicon support substrate 2, the low sound velocity film 5, and the piezoelectric body 6. Therefore, the connection electrodes 8 and 9 are not in direct contact with the silicon support substrate 2. Therefore, the current flowing through the connection electrodes 8 and 9 hardly leaks to the side of the silicon supporting substrate 2 which is a semiconductor. Therefore, deterioration of the characteristics is also less likely to occur.
- the lower ends of the through via electrodes 11 and 12 reach the second main surface 2 b of the silicon support substrate 2.
- the second main surface 2 b is a main surface on the side opposite to the side on which the piezoelectric body 6 is provided in the silicon support substrate 2.
- Terminal electrodes 13 and 14 are provided on the second main surface 2b. The terminal electrodes 13 and 14 are connected to the lower ends of the through via electrodes 11 and 12.
- the feature of the elastic wave device 1 is that the electrical resistance of the silicon support substrate 2 is higher than the electrical resistance of the silicon cover layer 4. Therefore, when the elastic wave device 1 is charged, charges flow from the side of the silicon supporting substrate 2 to the side of the silicon cover layer 4 having a low electric resistance. Accordingly, electrostatic breakdown of the IDT electrode 7 as a functional electrode is unlikely to occur.
- the elastic wave device 1 since the IDT electrode 7 is provided on the piezoelectric body 6, by applying an alternating electric field to the IDT electrode 7, the elastic wave can be excited in the piezoelectric body 6.
- the low sound velocity film 5 is made of a low sound velocity material in which the sound velocity of the propagating bulk wave is slower than the sound velocity of the bulk wave propagating through the piezoelectric body 6.
- a low sound velocity material an appropriate material satisfying the sound velocity relationship between the silicon supporting substrate 2 and the piezoelectric body 6 can be used.
- a medium containing the above material as a main component such as silicon oxide, glass, silicon oxynitride or tantalum oxide, or a compound obtained by adding fluorine, carbon or boron to silicon oxide, may be used it can.
- the thickness of the piezoelectric body 6 is usually considerably thinner than that of a piezoelectric single crystal substrate in an elastic wave device using a piezoelectric single crystal substrate.
- the thickness of the piezoelectric body 6 is preferably 3.5 ⁇ or less.
- the piezoelectric body 6 is thin, electrostatic breakdown easily occurs not only in the IDT electrode 7 but also in the functional portion on which the IDT electrode 7 and the piezoelectric body 6 are stacked.
- the elastic wave device 1 of the present embodiment since the electrical resistance of the silicon cover layer 4 is lower than the electrical resistance of the silicon supporting substrate 2, the generated charges are promptly applied to the silicon cover layer 4. It is made to flow, and it is made possible to control electrostatic breakdown of a function part.
- the piezoelectric body 6 is indirectly stacked on the silicon support substrate 2 via the low sound velocity film 5, but the piezoelectric body 6 may be directly stacked on the silicon support substrate 2. . Also in this case, the energy of the elastic wave can be effectively confined in the piezoelectric body 6, and the electrostatic breakdown of the IDT electrode 7 hardly occurs.
- the support layer 3 is made of a synthetic resin such as polyimide, but may be made of an insulator other than the synthetic resin, for example, an inorganic insulator.
- the support layer 3 is made of a photosensitive polyimide resin such as a photosensitive thermosetting polyimide. In that case, the cost of the support layer 3 can be reduced and the process can be simplified.
- the silicon cover layer be made of a p-type semiconductor and the silicon support substrate 2 be made of an n-type semiconductor.
- the resin becomes negative when charged. Therefore, when the silicon support substrate 2 is made of an n-type semiconductor and the silicon cover layer 4 is made of a p-type semiconductor, charges generated on the silicon support substrate 2 side will flow to the silicon cover layer 4 more quickly. Therefore, operation failure or damage due to electrostatic discharge is less likely to occur.
- the conductivity type of the semiconductor of the silicon support substrate 2 and the silicon cover layer 4 is not limited to the above combination. Both may be made of an n-type semiconductor or a p-type semiconductor.
- the dielectric film 10 is provided to cover the IDT electrode 7. Therefore, frequency adjustment can be performed by adjusting the thickness and material of the dielectric film 10. Further, by providing the dielectric film 10, the IDT electrode 7 can be protected from the periphery.
- the material of the dielectric film 10 is not particularly limited, but inorganic dielectric materials such as silicon oxide and silicon oxynitride can be suitably used.
- the space A be sealed. As a result, the influence of moisture in the air is less likely to occur, so that the variation of the characteristics of the elastic wave device 1 is less likely to occur.
- the through via electrodes 11 and 12 are preferably located in a region surrounded by the support layer 3 in a plan view.
- the connection electrodes 8 and 9 and the through via electrodes 11 and 12 can be connected in the region (space A) surrounded by the support layer 3, the connection electrodes 8 and 9 are surrounded by the support layer 3. It can be sealed in the area. Therefore, the connection electrodes 8 and 9 are less susceptible to the moisture in the air.
- the low sound velocity film 5 is located in the region surrounded by the support layer 3.
- the low sound velocity film 5 may extend to the lower surface of the support layer 3 and the outside of the support layer 3.
- the support layer 3 is indirectly laminated on the first major surface 2 a of the silicon support substrate 2.
- the support layer 3 is preferably laminated directly on the first major surface 2a.
- the support layer 3 has a frame-like shape, but is not limited to the frame-like shape as long as it can surround the functional part having the piezoelectric body 6 and the IDT electrode 7. Therefore, the space A is not limited to the sealed space.
- the IDT electrodes 7, the connection electrodes 8 and 9, the through via electrodes 11 and 12, and the terminal electrodes 13 and 14 are made of appropriate metals or alloys, and the material constituting them is not particularly limited.
- the electrode structure of the functional electrode having the IDT electrode 7 is not particularly limited, either, and the electrode structure including the IDT electrode 7 may be modified to constitute various functional units such as an elastic wave resonator or an elastic wave filter. Can.
- FIG. 2 is a front cross-sectional view of an elastic wave device according to a second embodiment of the present invention.
- the metal film 22 is provided on the lower surface of the silicon cover layer 4, that is, the entire main surface on the side facing the silicon support substrate 2. Except for this point, the elastic wave device 21 is configured in the same manner as the elastic wave device 1. Therefore, the description of the elastic wave device 1 will be incorporated by giving the same reference numerals to the same parts.
- the metal film 22 is made of an appropriate metal or alloy such as Cu or Al.
- the electrical resistance of the metal film 22 is even lower than the electrical resistance of the silicon cover layer 4. Therefore, even if the functional part on the silicon support substrate 2 side is charged, the charge moves from the silicon support substrate 2 to the silicon cover layer 4 side more quickly. Therefore, electrostatic breakdown of the IDT electrode 7 and the piezoelectric body 6 in the functional part can be more effectively suppressed.
- the metal film 22 may not necessarily be formed on the entire main surface of the silicon cover layer 4. It may be provided at least on the bonding surface of the support layer 3 and the silicon cover layer 4. However, it is preferable that the metal film 22 be provided on the entire surface as shown in FIG. Thereby, charge transfer can be performed more quickly. Therefore, operation failure or damage due to electrostatic discharge is less likely to occur.
- the metal film 22 may extend to the side surface or the upper surface of the silicon cover layer 4.
- FIG. 3 is a front sectional view of an elastic wave device according to a third embodiment of the present invention.
- a high sound velocity film 32 is provided on the silicon support substrate 2.
- the low sound velocity film 5 and the piezoelectric body 6 are stacked on the high sound velocity film 32. That is, the elastic wave device 31 is configured the same as the elastic wave device 1 except that the high sound velocity film 32 is provided.
- the high sound velocity film 32 is made of a high sound velocity material in which the sound velocity of the propagating bulk wave is faster than the sound velocity of the elastic wave propagating through the piezoelectric body 6.
- high sound velocity materials aluminum oxide, silicon carbide, silicon nitride, silicon oxynitride, silicon, sapphire, lithium tantalate, lithium niobate, quartz, alumina, zirconia, cordierite, mullite, steatite, foliate
- materials such as stellite, magnesia, DLC (diamond like carbon) or diamond, a medium containing the above material as a main component, or a medium containing a mixture of the above materials as a main component can be used.
- the film thickness of the high sound speed film 32 is preferably as large as possible, and 0.5 or more times the wavelength ⁇ of the elastic wave. It is desirable that it is 5 times or more.
- the energy of elastic waves can be effectively confined in the piezoelectric body 6. Also in the elastic wave device 31, since the electrical resistance of the silicon cover layer 4 is relatively low, electric charges flow quickly from the silicon supporting substrate 2 side to the silicon cover layer 4. Therefore, as in the first embodiment, electrostatic breakdown of the IDT electrode 7 and the piezoelectric body 6 in the functional portion can be suppressed.
- FIG. 4 is a front sectional view of an elastic wave device according to a fourth embodiment of the present invention.
- an acoustic reflection film is laminated between the silicon support substrate 2 and the piezoelectric body 6.
- the elastic wave device 40 does not have a low sound velocity film and a high sound velocity film.
- the other configurations of the elastic wave device 40 are the same as those of the elastic wave device 31.
- the acoustic reflection film has a high acoustic impedance layer 41 having a relatively high acoustic impedance and a low acoustic impedance layer 42 having a relatively low acoustic impedance.
- two high acoustic impedance layers 41 and two low acoustic impedance layers 42 are alternately stacked from the side of the first main surface 2 a of the silicon support substrate 2.
- the number of stacked high acoustic impedance layers 41 and low acoustic impedance layers 42 in the acoustic reflection film is not limited to this.
- Materials constituting the high acoustic impedance layer 41 and the low acoustic impedance layer 42 are not particularly limited as long as the relative relationship of the acoustic impedance is as described above.
- an inorganic material such as a metal, a semiconductor or a ceramic may be used, or an organic material such as a synthetic resin may be used.
- metals or ceramics having high acoustic impedance, which have relatively high acoustic impedance are preferably used.
- ceramics, a resin material or the like having a relatively low acoustic impedance can be suitably used.
- a metal having a high acoustic impedance such as Ag may be used for the high acoustic impedance layer 41, and a metal having a low acoustic impedance such as Pb may be used for the low acoustic impedance layer 42. That is, as long as the relative relationship of the said acoustic impedance is satisfy
- the high acoustic impedance layer 41 be stacked on the side farther from the piezoelectric body 6 than the low acoustic impedance layer 42. Also in the elastic wave device 40 having such an acoustic reflection film, the energy of the elastic wave can be effectively confined in the piezoelectric body 6. Further, also in the elastic wave device 40, the electric resistance of the silicon cover layer 4 is relatively low, so that the charges flow quickly from the silicon supporting substrate 2 side to the silicon cover layer 4. Therefore, also in the fourth embodiment, electrostatic breakdown of the IDT electrode 7 and the piezoelectric body 6 in the functional portion can be suppressed.
- the elastic wave device of each of the above embodiments can be used as a duplexer of a high frequency front end circuit or the like. An example of this is described below.
- FIG. 5 is a block diagram of a communication device and a high frequency front end circuit. Note that, in the same drawing, each component connected to the high frequency front end circuit 230, for example, the antenna element 202 and the RF signal processing circuit (RFIC) 203 are also illustrated.
- the high frequency front end circuit 230 and the RF signal processing circuit 203 constitute a communication device 240.
- the communication device 240 may include a power supply, a CPU, and a display.
- the high frequency front end circuit 230 includes a switch 225, duplexers 201A and 201B, low noise amplifier circuits 214 and 224, and power amplifier circuits 234a, 234b, 244a and 244b.
- the high frequency front end circuit 230 and the communication device 240 in FIG. 5 are an example of the high frequency front end circuit and the communication device, and the present invention is not limited to this configuration.
- the duplexer 201A has filters 211 and 212.
- the duplexer 201B includes filters 221 and 222.
- the duplexers 201A and 201B are connected to the antenna element 202 via the switch 225.
- the elastic wave device may be a duplexer 201A or 201B, or may be a filter 211, 212, 221 or 222.
- the elastic wave device is also applied to a multiplexer including three or more filters, for example, a triplexer in which antenna terminals of three filters are shared, a hexaplexer in which antenna terminals of six filters are shared. Can.
- the elastic wave device includes an elastic wave resonator, a filter, a duplexer, and a multiplexer including three or more filters.
- the multiplexer is not limited to the configuration including both the transmission filter and the reception filter, and may be configured to include only the transmission filter or only the reception filter.
- the switch 225 connects the antenna element 202 and a signal path corresponding to a predetermined band in accordance with a control signal from a control unit (not shown), and is formed of, for example, a single pole double throw (SPDT) type switch .
- SPDT single pole double throw
- the number of signal paths connected to the antenna element 202 is not limited to one, and may be plural. That is, the high frequency front end circuit 230 may support carrier aggregation.
- the low noise amplifier circuit 214 is a reception amplifier circuit that amplifies a high frequency signal (here, a high frequency received signal) that has passed through the antenna element 202, the switch 225, and the duplexer 201A, and outputs the amplified signal to the RF signal processing circuit 203.
- the low noise amplifier circuit 224 is a reception amplifier circuit that amplifies a high frequency signal (here, a high frequency received signal) that has passed through the antenna element 202, the switch 225, and the duplexer 201B, and outputs the amplified signal to the RF signal processing circuit 203.
- the power amplifier circuits 234 a and 234 b are transmission amplifier circuits that amplify a high frequency signal (here, a high frequency transmission signal) output from the RF signal processing circuit 203 and output the amplified high frequency signal to the antenna element 202 via the duplexer 201 A and the switch 225.
- the power amplifier circuits 244 a and 244 b are transmission amplifier circuits that amplify a high frequency signal (here, a high frequency transmission signal) output from the RF signal processing circuit 203 and output the amplified high frequency signal to the antenna element 202 via the duplexer 201 B and the switch 225. .
- the RF signal processing circuit 203 performs signal processing on the high frequency reception signal input from the antenna element 202 via the reception signal path by down conversion or the like, and outputs the reception signal generated by the signal processing. Further, the RF signal processing circuit 203 performs signal processing of the input transmission signal by up conversion or the like, and outputs a high frequency transmission signal generated by the signal processing to the power amplifier circuits 234 b and 244 b.
- the RF signal processing circuit 203 is, for example, an RFIC.
- the communication device may include a BB (baseband) IC. In this case, the BBIC processes the received signal processed by the RFIC. Also, the BBIC processes the transmission signal and outputs it to the RFIC.
- the reception signal processed by the BBIC or the transmission signal before the signal processing by the BBIC is, for example, an image signal or an audio signal.
- the high-frequency front end circuit 230 may include a duplexer according to a modification of the duplexers 201A and 201B instead of the duplexers 201A and 201B.
- the filters 231 and 232 in the communication device 240 are connected between the RF signal processing circuit 203 and the switch 225 without passing through the low noise amplifier circuits 214 and 224 and the power amplifier circuits 234a, 234b, 244a and 244b.
- the filters 231 and 232 are also connected to the antenna element 202 via the switch 225 in the same manner as the duplexers 201A and 201B.
- the elastic wave device, the high frequency front end circuit, and the communication device according to the embodiments of the present invention have been described above by taking the embodiments, the present invention can be realized by combining any of the components in the embodiments.
- various modifications which can be obtained by applying various modifications to those skilled in the art without departing from the spirit of the present invention with respect to the above embodiment, and various kinds of high frequency front end circuits and communication devices according to the present invention. Devices are also included in the present invention.
- the present invention is widely applicable to communication devices such as mobile phones as filters, multiplexers applicable to multi-band systems, front end circuits, and communication devices.
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- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Filters And Equalizers (AREA)
Abstract
Description
2…シリコン支持基板
2a…第1の主面
2b…第2の主面
3…支持層
4…シリコンカバー層
5…低音速膜
6…圧電体
7…IDT電極
8,9…接続電極
10…誘電体膜
11,12…貫通ビア電極
13,14…端子電極
21…弾性波装置
22…金属膜
31…弾性波装置
32…高音速膜
40…弾性波装置
41…高音響インピーダンス層
42…低音響インピーダンス層
201A,201B…デュプレクサ
202…アンテナ素子
203…RF信号処理回路
211,212…フィルタ
214…ローノイズアンプ回路
221,222…フィルタ
224…ローノイズアンプ回路
225…スイッチ
230…高周波フロントエンド回路
231,232…フィルタ
234a,234b…パワーアンプ回路
240…通信装置
244a,244b…パワーアンプ回路
Claims (17)
- シリコン支持基板と、
前記シリコン支持基板上に直接または間接に積層された圧電体と、
前記圧電体上に設けられた機能電極と、
前記シリコン支持基板上に直接または間接に積層されており、かつ平面視した場合に、前記機能電極の外側に設けられており、絶縁物からなる支持層と、
前記支持層上に積層されたシリコンカバー層と、
を備え、
前記シリコン支持基板と、前記支持層と、前記シリコンカバー層とにより囲まれた空間が形成されており、
前記シリコン支持基板の電気抵抗が、前記シリコンカバー層の電気抵抗よりも高い、弾性波装置。 - 前記支持層が感光性ポリイミド系樹脂からなる、請求項1に記載の弾性波装置。
- 前記シリコンカバー層が、p型半導体からなり、
前記シリコン支持基板がn型半導体からなる、請求項2に記載の弾性波装置。 - 前記シリコンカバー層の前記支持層が接合されている接合面に金属膜が設けられている、請求項1~3のいずれか1項に記載の弾性波装置。
- 前記金属膜が、前記シリコンカバー層の前記支持層が接合されている側の面全体に設けられている、請求項4に記載の弾性波装置。
- 前記支持層が、前記機能電極を囲む枠状の形状を有し、
前記圧電体が、前記支持層で囲まれた部分に配置されている、請求項1~5のいずれか1項に記載の弾性波装置。 - 前記機能電極が、IDT電極である、請求項1~6のいずれか1項に記載の弾性波装置。
- 前記IDT電極の電極指ピッチで定まる波長をλとしたときに、前記圧電体の厚みが3.5λ以下である、請求項7に記載の弾性波装置。
- 前記シリコン支持基板上に前記圧電体が直接積層されている、請求項1~8のいずれか1項に記載の弾性波装置。
- 前記シリコン支持基板と、前記圧電体との間に積層されており、前記圧電体を伝搬するバルク波の音速よりも、伝搬するバルク波の音速が低速である低音速材料からなる低音速膜をさらに備える、請求項1~8のいずれか1項に記載の弾性波装置。
- 前記シリコン支持基板と、前記低音速膜との間に積層されており、前記圧電体を伝搬する弾性波の音速よりも、伝搬するバルク波の音速が高速である高音速材料からなる高音速膜をさらに備える、請求項10に記載の弾性波装置。
- 前記シリコン支持基板と、前記圧電体との間に積層されており、音響インピーダンスが相対的に低い低音響インピーダンス層と、音響インピーダンスが相対的に高い高音響インピーダンス層とを有する音響反射膜をさらに備える、請求項1~8のいずれか1項に記載の弾性波装置。
- 前記機能電極を覆うように設けられた誘電体膜をさらに備える、請求項1~12のいずれか1項に記載の弾性波装置。
- 前記シリコン支持基板を貫通している複数の貫通ビア電極をさらに備え、
前記貫通ビア電極の一端が、前記機能電極に電気的に接続されており、他端が前記シリコン支持基板の前記圧電体が積層されている側とは反対側の面に至っており、
前記貫通ビア電極が、平面視において、前記支持層で囲まれた領域内に位置している、請求項1~13のいずれか1項に記載の弾性波装置。 - 前記支持層が前記シリコン支持基板上に直接形成されている、請求項1~14に記載の弾性波装置。
- 請求項1~15のいずれか1項に記載の弾性波装置と、
パワーアンプと、
を備える、高周波フロントエンド回路。 - 請求項16に記載の高周波フロントエンド回路と、
RF信号処理回路と、
を備える、通信装置。
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