Acoustic wave filter and high frequency circuit

Abstract

To provide an acoustic wave filter capable of suppressing degradation of characteristics during simultaneous communication while reducing the number of filters.SOLUTION: A filter 30 has a passband that includes a first band receiving band and a second band receiving band, and includes input terminals 301 and 302, an output terminal 303, a common terminal 3060, and a switch circuit 306 that includes selection terminals 3061 and 3062, a series arm resonator 304 connected between the selection terminal 3061 and the input terminal 301, a series arm resonator 305 connected between the selection terminal 3062 and the input terminal 302, and an acoustic wave resonator 307 connected between the common terminal 3060 and the output terminal 303.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an acoustic wave filter and a high-frequency circuit. [Background technology]

[0002] In order to improve the data rate of wireless links, mobile communication devices such as mobile phones are increasingly supporting carrier aggregation (CA) and dual connectivity (DC), which simultaneously use multiple frequency bands or multiple channels within the same frequency band. Patent Document 1 discloses a high-frequency circuit equipped with multiple filters for multiple frequency bands. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2023 / 276871 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the above-mentioned conventional technology, it is difficult to reduce the number of filters while suppressing degradation of characteristics during simultaneous communications.

[0005] Therefore, the present invention provides an acoustic wave filter and a high-frequency circuit that can reduce the number of filters while suppressing degradation of characteristics during simultaneous communication. [Means for solving the problem]

[0006] An acoustic wave filter according to one embodiment of the present invention is an acoustic wave filter having a passband including a first band receiving band and a second band receiving band, and includes a first input terminal and a second input terminal, an output terminal, a first switch circuit including a first common terminal, a first selection terminal and a second selection terminal, a first series arm acoustic wave resonator connected between the first selection terminal and the first input terminal, a second series arm acoustic wave resonator connected between the second selection terminal and the second input terminal, and an acoustic wave resonator connected between the first common terminal and the output terminal.

[0007] A high-frequency circuit according to one embodiment of the present invention comprises the above-described acoustic wave filter, a first filter having a pass band including the reception band of the third band, a second filter having a pass band including the reception band of the fourth band, and a second switch circuit including a second common terminal connected to an antenna connection terminal, a third selection terminal, and a fourth selection terminal, wherein the third selection terminal is connected to a first input terminal of the acoustic wave filter and is also connected to the first filter, the fourth selection terminal is connected to a second input terminal of the acoustic wave filter and is also connected to the second filter, the combination of the first band and the third band is a band combination that allows simultaneous communication, and the combination of the second band and the fourth band is a band combination that allows simultaneous communication.

[0008] An acoustic wave filter according to one aspect of the present invention is an acoustic wave filter capable of switching between a first pass band including a first receive band and a second pass band including a second receive band, and includes: a first input terminal, a second input terminal, and a third input terminal; a first output terminal and a second output terminal; a first switch circuit including a first common terminal, a second common terminal, a first selection terminal, a second selection terminal, and a third selection terminal; a first series arm acoustic wave resonator connected between the first selection terminal and the first input terminal; a second series arm acoustic wave resonator connected between the second selection terminal and the second input terminal; a third series arm acoustic wave resonator connected between the third selection terminal and the third input terminal; a first acoustic wave resonator connected between the first common terminal and the first output terminal; and a second acoustic wave resonator connected between the second common terminal and the second output terminal.

[0009] A high-frequency circuit according to one aspect of the present invention includes the above-described acoustic wave filter, a first filter having a passband including a third receive band, a second filter having a passband including a fourth receive band, a third filter having a passband including a fifth receive band, and a second switch circuit including a third common terminal connected to an antenna connection terminal and fourth, fifth, and sixth selection terminals, wherein the fourth selection terminal is connected to a first input terminal of the acoustic wave filter and is also connected to the first filter, and the fifth selection terminal is connected to a second input terminal of the acoustic wave filter and is also connected to the second filter. the sixth selection terminal is connected to the third input terminal of the acoustic wave filter and is also connected to the third filter; at least one of the combination of the first band and the third band and the combination of the second band and the third band is a band combination that allows simultaneous communication; at least one of the combination of the first band and the fourth band and the combination of the second band and the fourth band is a band combination that allows simultaneous communication; and at least one of the combination of the first band and the fifth band and the combination of the second band and the fifth band is a band combination that allows simultaneous communication. [Effects of the Invention]

[0010] According to the present invention, it is possible to reduce the number of filters while suppressing deterioration of characteristics during simultaneous communication. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a circuit configuration diagram of a communication device according to the first embodiment. [Figure 2] FIG. 2 is a circuit configuration diagram of the acoustic wave filter according to the first embodiment. [Figure 3] FIG. 3 is a circuit configuration diagram of a communication device according to the second embodiment. [Figure 4] FIG. 4 is a circuit configuration diagram of a communication device according to the third embodiment. [Figure 5] FIG. 5 is a circuit configuration diagram of a communication device according to a modification of the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, arrangements and connection forms of the components shown in the following embodiments are merely examples and are not intended to limit the present invention.

[0013] It should be noted that the drawings are schematic diagrams in which emphasis, omission, or adjustment of proportions has been appropriately made to illustrate the present invention, and are not necessarily strictly illustrated, and may differ from the actual shapes, positional relationships, and proportions. In the drawings, the same reference numerals are used to denote substantially the same components, and redundant explanations may be omitted or simplified.

[0014] In the following description, "connected" includes not only direct connection by connection terminals and / or wiring conductors, but also electrical connection via other circuit elements. "A is switchably connected to B" means that the connection and disconnection between A and B can be switched, and A is connected to B via a switch. "A is connected to B" includes "A is switchably connected to B." "C is connected between A and B" means that one end of C is connected to A and the other end of C is connected to B, and C is connected in series to the path connecting A and B. "Path connecting A and B" means a path made up of a conductor that electrically connects A to B.

[0015] "Terminal" means a point where a conductor within an element terminates. Note that terminal is understood to mean any point on the conductor between elements or the entire conductor, not just a single point, provided the impedance of the conductor between elements is sufficiently low.

[0016] The "passband of a filter" is defined as the portion of the frequency spectrum transmitted by the filter over which the output power is not attenuated by more than 3 dB below the maximum output power. The upper and lower ends of a bandpass filter's passband are therefore identified as the higher and lower frequencies of the two points where the output power is attenuated by 3 dB below the maximum output power.

[0017] The term "transmission band" refers to a frequency band used for transmission in a communication device, and the term "reception band" refers to a frequency band used for reception in a communication device. For example, in a frequency division duplex (FDD) band, different frequency bands (e.g., an uplink band and a downlink band) are used as the transmission band and the reception band. For example, in a time division duplex (TDD) band, the same frequency band is used as the transmission band and the reception band.

[0018] A "band combination that allows simultaneous communication" refers to a predefined combination of multiple bands that can be used for simultaneous transmission, simultaneous reception, or simultaneous transmission and reception. The definition of a "band combination that allows simultaneous communication" is determined by a standardization organization (e.g., 3GPP (registered trademark) (3rd Generation Partnership Project) and IEEE (Institute of Electrical and Electronics Engineers)). A "band combination that allows simultaneous communication" is defined as a band combination for CA, EN-DC (E-UTRAN New Radio - Dual Connectivity), NR-DC (New Radio - Dual Connectivity), or NE-DC (New Radio E-UTRAN - Dual Connectivity).

[0019] Terms indicating the relationship between elements, such as "parallel" and "perpendicular," terms indicating the shape of elements, such as "rectangle," and numerical ranges do not only indicate strict meanings, but also include substantially equivalent ranges, for example, including an error of a few percent.

[0020] (Embodiment 1) A first embodiment will be described. A communication device 5 according to this embodiment can be used to provide wireless connectivity. For example, the communication device 5 can be implemented in UEs in a cellular network (also referred to as a mobile network), such as mobile phones, smartphones, tablet computers, and wearable devices. In another example, the communication device 5 can be implemented to provide wireless connectivity to Internet of Things (IoT) sensor devices, medical / healthcare devices, cars, unmanned aerial vehicles (UAVs) (so-called drones), and automated guided vehicles (AGVs). In yet another example, the communication device 5 can be implemented to provide wireless connectivity at a wireless access point or a wireless hotspot.

[0021] The circuit configuration of a communication device 5 and a high-frequency circuit 1 according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a circuit configuration diagram of a communication device 5 according to this embodiment.

[0022] 1 is an exemplary circuit configuration, and communication device 5 may be implemented using any of a wide variety of circuit implementations and circuit technologies. Therefore, the description of communication device 5 provided below should not be construed as limiting.

[0023] 1, the numbers marked with B next to the filters represent numbers that identify the frequency bands of LTE and / or 5GNR. For example, "B1" represents Band1 for LTE and / or n1 for 5GNR. Note that the frequency bands shown in FIG. 1 are examples to facilitate understanding by those skilled in the art, and the frequency bands corresponding to each filter are not limited to those shown in FIG. 1.

[0024] [1.1 Circuit configuration of communication device 5] First, the circuit configuration of a communication device 5 according to this embodiment will be described with reference to Fig. 1. The communication device 5 includes a high-frequency circuit 1, an antenna 2, an RFIC (Radio Frequency Integrated Circuit) 3, and a BBIC (Baseband Integrated Circuit) 4.

[0025] The high-frequency circuit 1 can transmit high-frequency signals between the antenna 2 and the RFIC 3. The circuit configuration of the high-frequency circuit 1 will be described later.

[0026] The antenna 2 is connected to the antenna connection terminal 100 of the high-frequency circuit 1. The antenna 2 can receive a high-frequency signal from the high-frequency circuit 1 and transmit it to the outside of the communication device 5. The antenna 2 can also receive a high-frequency signal from the outside of the communication device 5 and output it to the high-frequency circuit 1. The antenna 2 does not have to be included in the communication device 5. The communication device 5 may further include one or more additional antennas in addition to the antenna 2. In this case, the switch circuit 50 may include one or more additional common terminals, and the one or more additional antennas may be connected to the one or more additional common terminals.

[0027] The RFIC 3 is an example of a signal processing circuit that processes radio frequency signals. Specifically, the RFIC 3 can perform signal processing on a transmission signal input from the BBIC 4 by up-conversion or the like, and output the radio frequency transmission signal generated by the signal processing to the radio frequency circuit 1. Furthermore, the RFIC 3 can perform signal processing on a radio frequency reception signal input via the reception path of the radio frequency circuit 1 by down-conversion or the like, and output the reception signal generated by the signal processing to the BBIC 4. The RFIC 3 may also have a control unit that controls the switches, power amplifiers, and the like included in the radio frequency circuit 1. Note that some or all of the functions of the RFIC 3 as a control unit may be included outside the RFIC 3, for example, in the BBIC 4 or the radio frequency circuit 1.

[0028] The BBIC 4 is a baseband signal processing circuit that processes signals using a frequency band lower than the high-frequency signals transmitted by the high-frequency circuit 1. The signals processed by the BBIC 4 include, for example, image signals for image display and / or audio signals for calls via a speaker. The BBIC 4 does not necessarily have to be included in the communication device 5.

[0029] [1.2. Circuit configuration of high frequency circuit 1] Next, the circuit configuration of a high-frequency circuit 1 according to this embodiment will be described with reference to Fig. 1. The high-frequency circuit 1 includes low-noise amplifiers 20, 21, 22, 23, 24, 25, 26, 27, and 28, filters 30, 31, 32, 33, 34, 35, 36, 37, and 38, a switch circuit 50, an antenna connection terminal 100, and high-frequency output terminals 120, 121, 122, 123, 124, 125, 126, 127, and 128.

[0030] The antenna connection terminal 100 is an external connection terminal of the high-frequency circuit 1, and is connected to the antenna 2 outside the high-frequency circuit 1. The antenna connection terminal 100 is also connected to a switch circuit 50 inside the high-frequency circuit 1. This allows the high-frequency circuit 1 to receive a reception signal from the antenna 2 via the antenna connection terminal 100.

[0031] Each of the radio frequency output terminals 120 to 128 is an external connection terminal of the radio frequency circuit 1, and is connected to the RFIC 3 outside the radio frequency circuit 1. The radio frequency output terminals 120 to 128 are also connected to the output ends of the low noise amplifiers 20 to 28, respectively, inside the radio frequency circuit 1. This allows the radio frequency circuit 1 to supply the received signals of the first to tenth bands amplified by the low noise amplifiers 20 to 28 to the RFIC 3 via the radio frequency output terminals 120 to 128, respectively.

[0032] The input terminals of the low-noise amplifiers 20 to 28 are connected to filters 30 to 38, respectively. The output terminals of the low-noise amplifiers 20 to 28 are connected to high-frequency output terminals 120 to 128, respectively. This allows the low-noise amplifier 20 to amplify received signals of the first and second bands. The low-noise amplifiers 21 to 28 can amplify received signals of the third to tenth bands, respectively.

[0033] The low-noise amplifiers 20 to 28 may be configured with field-effect transistors (FETs) and may be manufactured using semiconductor materials. Examples of semiconductor materials that may be used include silicon single crystal, gallium nitride (GaN), and silicon carbide (SiC). The amplifying transistors of the low-noise amplifiers 20 to 28 are not limited to FETs. For example, some or all of the low-noise amplifiers 20 to 28 may be configured with bipolar transistors.

[0034] Note that some or all of the low-noise amplifiers 20 to 28 do not need to be included in the high-frequency circuit 1. In this case, some or all of the low-noise amplifiers 20 to 28 may be connected between the high-frequency output terminals 120 to 128 and the RFIC 3, or may be included in the RFIC 3.

[0035] The filter 30 is an acoustic wave filter, and is a band-pass filter having a pass band that includes the reception band of the first band (B1) and the reception band of the second band (B66). One end of the filter 30 is connected to the input terminal of the low-noise amplifier 20, and the other end of the filter 30 is connected to selection terminals 501 and 502 of the switch circuit 50.

[0036] In this embodiment, the first band may be Band 1 for LTE or n1 for 5GNR, but is not limited to this. Also, the second band may be Band 66 for LTE or n66 for 5GNR, but is not limited to this.

[0037] The filter 30 includes input terminals 301 and 302 , an output terminal 303 , series arm resonators 304 and 305 , a switch circuit 306 , and an acoustic wave resonator 307 .

[0038] The input terminal 301 is an example of a first input terminal, and is connected to the selection terminal 501 of the switch circuit 50 outside the filter 30 , and is connected to the series arm resonator 304 inside the filter 30 .

[0039] The input terminal 302 is an example of a second input terminal, and is connected to the selection terminal 502 of the switch circuit 50 outside the filter 30 , and is connected to the series arm resonator 305 inside the filter 30 .

[0040] Output terminal 303 is connected to the input end of low noise amplifier 20 outside filter 30 , and is connected to acoustic wave resonator 307 inside filter 30 .

[0041] Series arm resonator 304 is an example of a first series arm acoustic wave resonator, and is connected between input terminal 301 and switch circuit 306 .

[0042] Series arm resonator 305 is an example of a second series arm acoustic wave resonator, and is connected between input terminal 302 and switch circuit 306 .

[0043] Switch circuit 306 is an example of a first switch circuit and is connected between series arm resonators 304 and 305 and acoustic wave resonator 307. Switch circuit 306 includes a common terminal 3060 and selection terminals 3061 and 3062. Common terminal 3060 is an example of a first common terminal and is connected to acoustic wave resonator 307. Selection terminal 3061 is an example of a first selection terminal and is connected to series arm resonator 304. Selection terminal 3062 is an example of a second selection terminal and is connected to series arm resonator 305.

[0044] In such a connection configuration, the switch circuit 306 can exclusively connect the common terminal 3060 to the selection terminals 3061 and 3062, for example, based on a control signal from the RFIC 3. The switch circuit 306 is configured, for example, by an SPDT (Single-Pole Double-Throw) type switch circuit.

[0045] The acoustic wave resonator 307 is connected between the output terminal 303 and a common terminal 3060 of the switch circuit 306. The acoustic wave resonator 307 is selectively connected to the series arm resonators 304 and 305 via the switch circuit 306. The resonant frequencies of the series arm resonators 304 and 305 may be included in the pass band of the filter 30, thereby forming the pass band of the filter 30.

[0046] The filter 31 is an example of a first filter, and is a band-pass filter having a pass band that includes the reception band of the third band (B3). One end of the filter 31 is connected to the input terminal of the low-noise amplifier 21, and the other end of the filter 31 is connected to the selection terminal 501 of the switch circuit 50.

[0047] The combination of the first band and the third band is a band combination that allows simultaneous communication. As such a third band, Band 3 for LTE or n3 for 5GNR can be used, but the third band is not limited thereto.

[0048] The filter 32 is an example of a second filter, and is a band-pass filter having a pass band that includes the reception band of the fourth band (B25). One end of the filter 32 is connected to the input terminal of the low-noise amplifier 22, and the other end of the filter 32 is connected to the selection terminal 502 of the switch circuit 50.

[0049] The combination of the second band and the fourth band is a band combination that allows simultaneous communication. As such a fourth band, Band 25 for LTE or n25 for 5GNR can be used, but the fourth band is not limited thereto.

[0050] The filter 33 is an example of a third filter, and is a band-pass filter having a pass band that includes the reception band of the fifth band (B40). One end of the filter 33 is connected to the input terminal of the low-noise amplifier 23, and the other end of the filter 33 is connected to the selection terminal 501 of the switch circuit 50. The filter 33 does not necessarily have to be included in the high-frequency circuit 1.

[0051] The combination of the first band and the fifth band is a band combination that allows simultaneous communication. As such a fifth band, Band 40 for LTE or n40 for 5GNR can be used, but the fifth band is not limited thereto.

[0052] The filter 34 is an example of a fourth filter, and is a band-pass filter having a pass band that includes the reception band of the sixth band (B30). One end of the filter 34 is connected to the input terminal of the low-noise amplifier 24, and the other end of the filter 34 is connected to the selection terminal 502 of the switch circuit 50. The filter 34 does not necessarily have to be included in the high-frequency circuit 1.

[0053] The combination of the second band and the sixth band is a band combination that allows simultaneous communication. As such a sixth band, Band 30 for LTE or n30 for 5GNR can be used, but the sixth band is not limited thereto.

[0054] The filter 35 is an example of a fifth filter, and is a band-pass filter having a pass band that includes the reception band of the seventh band (B34). One end of the filter 35 is connected to the input terminal of the low-noise amplifier 25, and the other end of the filter 35 is connected to the selection terminal 503 of the switch circuit 50. The filter 35 does not necessarily have to be included in the high-frequency circuit 1.

[0055] The filter 36 is an example of a sixth filter, and is a band-pass filter having a pass band that includes the reception band of the eighth band (B39). One end of the filter 36 is connected to the input terminal of the low-noise amplifier 26, and the other end of the filter 36 is connected to the selection terminal 503 of the switch circuit 50. The filter 36 does not necessarily have to be included in the high-frequency circuit 1.

[0056] The combination of the seventh band and the eighth band is a band combination that allows simultaneous communication. The seventh band may be Band 34 for LTE or n34 for 5GNR, and the eighth band may be Band 39 for LTE or n39 for 5GNR, but the seventh band and the eighth band are not limited thereto.

[0057] The filter 37 is an example of a seventh filter, and is a band-pass filter having a pass band that includes the reception band of the ninth band (B7). One end of the filter 37 is connected to the input terminal of the low-noise amplifier 27, and the other end of the filter 37 is connected to the selection terminal 504 of the switch circuit 50. The filter 37 does not necessarily have to be included in the high-frequency circuit 1.

[0058] The combination of the first band and the ninth band, and the combination of the second band and the ninth band are band combinations that allow simultaneous communication. As such a ninth band, Band 7 for LTE or n7 for 5GNR can be used, but the ninth band is not limited thereto.

[0059] The filter 38 is an example of an eighth filter, and is a band-pass filter having a pass band that includes the reception band of the tenth band (B41). One end of the filter 38 is connected to the input terminal of the low-noise amplifier 28, and the other end of the filter 38 is connected to the selection terminal 505 of the switch circuit 50. The filter 38 does not necessarily have to be included in the high-frequency circuit 1.

[0060] The combination of the first band and the tenth band, and the combination of the second band and the tenth band are band combinations that allow simultaneous communication. As such a tenth band, Band 41 for LTE or n41 for 5GNR can be used, but the tenth band is not limited thereto.

[0061] The switch circuit 50 is an example of a second switch circuit and is connected between the antenna connection terminal 100 and the filters 30 to 38. Specifically, the switch circuit 50 includes a common terminal 500 and selection terminals 501 to 505. The common terminal 500 is an example of a second common terminal and is connected to the antenna connection terminal 100. The selection terminal 501 is an example of a third selection terminal and is connected to the filters 30, 31, and 33. The selection terminal 502 is an example of a fourth selection terminal and is connected to the filters 30, 32, and 34. The selection terminal 503 is an example of a fifth selection terminal and is connected to the filters 35 and 36. The selection terminal 504 is an example of a sixth selection terminal and is connected to the filter 37. The selection terminal 505 is an example of a seventh selection terminal and is connected to the filter 38. Note that the selection terminals 503 to 505 do not necessarily have to be included in the switch circuit 50.

[0062] In such a connection configuration, the switch circuit 50 can connect the common terminal 500 to the selection terminals 501 to 505, for example, based on a control signal from the RFIC 3. For example, the switch circuit 50 can connect the common terminal 500 to the selection terminals 501 and 504 simultaneously, and can connect the common terminal 500 to the selection terminals 502 and 504 simultaneously. Furthermore, for example, the switch circuit 50 can connect the common terminal 500 to the selection terminals 501 and 505 simultaneously, and can connect the common terminal 500 to the selection terminals 502 and 505 simultaneously. The switch circuit 50 is configured, for example, as a multi-connection type switch circuit.

[0063] [1.3. Filter 30 Implementation Example] Next, an example of how the filter 30 is implemented will be described with reference to Fig. 2. Fig. 2 shows an example of how the filters 30 to 34 according to this embodiment are implemented.

[0064] 2 is an exemplary diagram, and filters 30-34 may be implemented using any of a wide variety of circuit implementations and circuit techniques, and therefore, the description of filters 30-34 provided below should not be construed as limiting.

[0065] The filter 30 is divided and mounted on a plurality of substrates SB1, SB2, and SB3. The substrates SB1, SB2, and SB3 each include, for example, a piezoelectric body, and an acoustic wave resonator is formed by a functional electrode formed on the piezoelectric body.

[0066] A plurality of acoustic wave resonators S02, S03, S04, S05, P01, P02, P03, and P04 and external connection terminals T01 and T02 are arranged on the substrate SB1.

[0067] The acoustic wave resonators S02 to S05 and P01 to P04 are an example of an implementation of acoustic wave resonator 307. Each of the acoustic wave resonators S02 to S05 and P01 to P04 is configured, for example, as a bulk acoustic wave (BAW) resonator or a surface acoustic wave (SAW) resonator. The acoustic wave resonators S02 to S05 are connected in series on a signal path connecting external connection terminals T01 and T02, and the acoustic wave resonators P01 to P04 are connected in parallel between the signal path connecting external connection terminals T01 and T02 and ground. The number of acoustic wave resonators included in acoustic wave resonator 307 is not limited to eight. The acoustic wave resonator 307 may include an inductor and / or a capacitor.

[0068] The external connection terminal T01 is connected to the switch circuit 306 outside the substrate SB1 and is connected to the acoustic wave resonator S02 inside the substrate SB1. The external connection terminal T02 is one implementation example of the output terminal 303, and is connected to the input terminal of the low-noise amplifier 20 outside the substrate SB1 and is connected to the acoustic wave resonator S05 inside the substrate SB1. The external connection terminals T01 and T02 can be formed, for example, by copper bumps, solder bumps, etc.

[0069] An acoustic wave resonator S011 and external connection terminals T11 and T14 are arranged on the substrate SB2.

[0070] The acoustic wave resonator S011 is an example of an implementation of the series arm resonator 304, and is configured by, for example, a BAW resonator or a SAW resonator. The acoustic wave resonator S011 is connected in series on a signal path connecting the external connection terminals T11 and T14.

[0071] The external connection terminal T11 is one implementation example of the input terminal 301, and is connected to the selection terminal 501 of the switch circuit 50 outside the substrate SB2, and is connected to one end of the acoustic wave resonator S011 inside the substrate SB2. The external connection terminal T14 is connected to the selection terminal 3061 of the switch circuit 306 outside the substrate SB2, and is connected to the other end of the acoustic wave resonator S011 inside the substrate SB2. The external connection terminals T11 and T14 can be formed, for example, by copper bumps, solder bumps, etc.

[0072] The substrate SB2 further has a plurality of acoustic wave resonators S11, S12, S13, S14, S15, P11, P12, P13, P14, S31, S32, S33, S34, S35, P31, P32, P33, and P34 and external connection terminals T12 and T13 arranged thereon.

[0073] The acoustic wave resonators S11 to S15 and P11 to P14 are an example of an implementation of the filter 31. Each of the acoustic wave resonators S11 to S15 and P11 to P14 is formed of, for example, a BAW resonator or a SAW resonator. The acoustic wave resonators S11 to S15 are connected in series on a signal path connecting the external connection terminals T11 and T12, and the acoustic wave resonators P11 to P14 are connected in parallel between the signal path connecting the external connection terminals T11 and T12 and ground. The number of acoustic wave resonators included in the filter 31 is not limited to nine. The filter 31 may also include an inductor and / or a capacitor.

[0074] The acoustic wave resonators S31 to S35 and P31 to P34 are an example of an implementation of the filter 33. Each of the acoustic wave resonators S31 to S35 and P31 to P34 is formed of, for example, a BAW resonator or a SAW resonator. The acoustic wave resonators S31 to S35 are connected in series on a signal path connecting the external connection terminals T11 and T13, and the acoustic wave resonators P31 to P34 are connected in parallel between the signal path connecting the external connection terminals T11 and T13 and ground. The number of acoustic wave resonators included in the filter 33 is not limited to nine. The filter 33 may also include an inductor and / or a capacitor.

[0075] The external connection terminal T12 is connected to an input terminal of the low-noise amplifier 21 outside the substrate SB2, and is connected to the acoustic wave resonator S15 inside the substrate SB2. The external connection terminal T13 is connected to an input terminal of the low-noise amplifier 23 outside the substrate SB2, and is connected to the acoustic wave resonator S35 inside the substrate SB2. The external connection terminals T12 and T13 may be formed of, for example, copper bumps, solder bumps, etc.

[0076] An acoustic wave resonator S012 and external connection terminals T21 and T24 are arranged on the substrate SB3.

[0077] The acoustic wave resonator S012 is an example of an implementation of the series arm resonator 305 and is configured by, for example, a BAW resonator or a SAW resonator. The acoustic wave resonator S012 is connected in series on a signal path connecting the external connection terminals T21 and T24.

[0078] The external connection terminal T21 is one implementation example of the input terminal 302, and is connected to the selection terminal 502 of the switch circuit 50 outside the substrate SB3, and is connected to one end of the acoustic wave resonator S012 inside the substrate SB3. The external connection terminal T24 is connected to the selection terminal 3062 of the switch circuit 306 outside the substrate SB3, and is connected to the other end of the acoustic wave resonator S012 inside the substrate SB3. The external connection terminals T21 and T24 can be formed, for example, by copper bumps, solder bumps, etc.

[0079] The substrate SB3 further has a plurality of acoustic wave resonators S21, S22, S23, S24, S25, P21, P22, P23, P24, S41, S42, S43, S44, S45, P41, P42, P43 and P44 and external connection terminals T22 and T23 arranged thereon.

[0080] The acoustic wave resonators S21 to S25 and P21 to P24 are an example of an implementation of the filter 32. Each of the acoustic wave resonators S21 to S25 and P21 to P24 is formed of, for example, a BAW resonator or a SAW resonator. The acoustic wave resonators S21 to S25 are connected in series on a signal path connecting the external connection terminals T21 and T22, and the acoustic wave resonators P21 to P24 are connected in parallel between the signal path connecting the external connection terminals T21 and T22 and ground. The number of acoustic wave resonators included in the filter 32 is not limited to nine. The filter 32 may also include an inductor and / or a capacitor.

[0081] The acoustic wave resonators S41 to S45 and P41 to P44 are an example of an implementation of the filter 34. Each of the acoustic wave resonators S41 to S45 and P41 to P44 is formed of, for example, a BAW resonator or a SAW resonator. The acoustic wave resonators S41 to S45 are connected in series on a signal path connecting the external connection terminals T21 and T23, and the acoustic wave resonators P41 to P44 are connected in parallel between the signal path connecting the external connection terminals T21 and T23 and ground. The number of acoustic wave resonators included in the filter 34 is not limited to nine. The filter 34 may also include an inductor and / or a capacitor.

[0082] The external connection terminal T22 is connected to the input terminal of the low-noise amplifier 22 outside the substrate SB3, and is connected to the acoustic wave resonator S25 inside the substrate SB3. The external connection terminal T23 is connected to the input terminal of the low-noise amplifier 24 outside the substrate SB3, and is connected to the acoustic wave resonator S45 inside the substrate SB3. The external connection terminals T22 and T23 may be formed of, for example, copper bumps, solder bumps, etc.

[0083] 2, the filters 31 and 33 are mounted on the same substrate SB2, but they may be mounted on separate substrates. Similarly, the filters 32 and 34 may be mounted on separate substrates.

[0084] [1.4. Summary] As described above, the filter 30 according to this embodiment has a passband that includes the first band reception band and the second band reception band, and includes input terminals 301 and 302, an output terminal 303, a common terminal 3060, and a switch circuit 306 that includes selection terminals 3061 and 3062, a series arm resonator 304 connected between the selection terminal 3061 and the input terminal 301, a series arm resonator 305 connected between the selection terminal 3062 and the input terminal 302, and an acoustic wave resonator 307 connected between the common terminal 3060 and the output terminal 303.

[0085] This allows one filter 30 to support both the first and second reception bands, thereby reducing the number of filters compared to when separate filters are provided for the first and second reception bands. Furthermore, two series arm resonators 304 and 305 connected to two input terminals 301 and 302, respectively, can be selectively connected to acoustic wave resonator 307 by switch circuit 306. Therefore, the number of acoustic wave resonators can be reduced compared to when two acoustic wave resonators are connected to two input terminals 301 and 302, respectively, thereby reducing the size of filter 30. Furthermore, two series arm resonators 304 and 305 can be connected to selection terminals 501 and 502 of switch circuit 50 via input terminals 301 and 302, respectively. Therefore, it becomes easy to adjust the impedance of other bands (e.g., the third and fourth bands) that can communicate simultaneously with the first band or the second band when viewing the filter 30 from the selection terminals 501 and 502 of the switch circuit 50, and it is possible to suppress signal loss in the other bands when receiving signals of the first band and signals of the other bands simultaneously.

[0086] Furthermore, for example, in the filter 30 according to this embodiment, the resonant frequency of the series arm resonator 304 may be included in the passband of the filter 30 .

[0087] This allows the series arm resonators 304 to be used to form the passband of the filter 30, and the number of resonators can be reduced compared to when the series arm resonators 304 are used simply for impedance adjustment.

[0088] Furthermore, for example, in the filter 30 according to this embodiment, the resonant frequency of the series arm resonator 305 may be included in the passband of the filter 30.

[0089] This allows the series arm resonators 305 to be used to form the passband of the filter 30, and the number of resonators can be reduced compared to when the series arm resonators 305 are used simply for impedance adjustment.

[0090] Moreover, the high-frequency circuit 1 according to this embodiment includes a filter 30, a filter 31 having a pass band that includes the reception band of the third band, a filter 32 having a pass band that includes the reception band of the fourth band, and a switch circuit 50 including a common terminal 500 connected to the antenna connection terminal 100 and selection terminals 501 and 502, the selection terminal 501 is connected to the input terminal 301 of the filter 30 and also to the filter 31, the selection terminal 502 is connected to the input terminal 302 of the filter 30 and also to the filter 32, the combination of the first band and the third band is a band combination that allows simultaneous communication, and the combination of the second band and the fourth band is a band combination that allows simultaneous communication.

[0091] This allows one filter 30 to support both the first and second reception bands, thereby reducing the number of filters compared to when separate filters are provided for the first and second reception bands. Furthermore, two series arm resonators 304 and 305 connected to two input terminals 301 and 302, respectively, can be selectively connected to acoustic wave resonator 307 by switch circuit 306. Therefore, the number of acoustic wave resonators can be reduced compared to when two acoustic wave resonators are connected to two input terminals 301 and 302, respectively, thereby enabling the size of filter 30 to be reduced. Furthermore, two series arm resonators 304 and 305 are connected to selection terminals 501 and 502 of switch circuit 50 via input terminals 301 and 302, respectively. Therefore, it is easy to adjust the impedance of the third band when filter 30 is viewed from selection terminal 501 of switch circuit 50, and signal loss in the third band can be reduced when first and third band signals are simultaneously received. Similarly, it becomes easy to adjust the impedance of the fourth band when viewing the filter 30 from the selection terminal 502 of the switch circuit 50, and it is possible to suppress signal loss in the fourth band when receiving signals of the second band and the fourth band simultaneously.

[0092] Furthermore, the high-frequency circuit 1 according to this embodiment may further include a filter 33 connected to the selection terminal 501 and having a pass band including the reception band of the fifth band, and a filter 34 connected to the selection terminal 502 and having a pass band including the reception band of the sixth band, and the combination of the first band and the fifth band may be a band combination that allows simultaneous communication, and the combination of the second band and the sixth band may be a band combination that allows simultaneous communication.

[0093] This makes it easy to adjust the impedance of the fifth band when viewing the filter 30 from the selection terminal 501 of the switch circuit 50, thereby suppressing signal loss in the fifth band when receiving signals of the first band and the fifth band simultaneously. Similarly, it makes it easy to adjust the impedance of the sixth band when viewing the filter 30 from the selection terminal 502 of the switch circuit 50, thereby suppressing signal loss in the sixth band when receiving signals of the second band and the sixth band simultaneously.

[0094] Furthermore, in the high-frequency circuit 1 according to this embodiment, the switch circuit 50 may further include a selection terminal 503, and the high-frequency circuit 1 may further include a filter 35 connected to the selection terminal 503 and having a pass band that includes the reception band of the seventh band, and a filter 36 connected to the selection terminal 503 and having a pass band that includes the reception band of the eighth band, and the combination of the seventh band and the eighth band may be a band combination that allows simultaneous communication.

[0095] This makes it possible to simultaneously receive signals in the seventh and eighth bands.

[0096] Furthermore, in the high-frequency circuit 1 according to this embodiment, the switch circuit 50 may further include a selection terminal 504, and the high-frequency circuit 1 may further include a filter 37 connected to the selection terminal 504 and having a pass band including the reception band of the ninth band, and the combination of the first band and the ninth band, and the combination of the second band and the ninth band may be a band combination that allows simultaneous communication.

[0097] This makes it possible to simultaneously receive a signal in the first or second band and a signal in the ninth band.

[0098] Furthermore, in the high-frequency circuit 1 according to this embodiment, the switch circuit 50 may further include a selection terminal 505, and the high-frequency circuit 1 may further include a filter 38 connected to the selection terminal 505 and having a pass band including the reception band of the tenth band, and the combination of the first band and the tenth band, and the combination of the second band and the tenth band may be band combinations that enable simultaneous communication.

[0099] This makes it possible to simultaneously receive a signal in the first band or the second band and a signal in the tenth band.

[0100] Furthermore, in the high-frequency circuit 1 according to this embodiment, the first band may be Band 1 for LTE or n1 for 5GNR, the second band may be Band 66 for LTE or n66 for 5GNR, the third band may be Band 3 for LTE or n3 for 5GNR, the fourth band may be Band 25 for LTE or n25 for 5GNR, the fifth band may be Band 40 for LTE or n40 for 5GNR, the sixth band may be Band 30 for LTE or n30 for 5GNR, the seventh band may be Band 34 for LTE or n34 for 5GNR, the eighth band may be Band 39 for LTE or n39 for 5GNR, the ninth band may be Band 7 for LTE or n7 for 5GNR, and the tenth band may be Band 41 for LTE or n41 for 5GNR.

[0101] This allows it to support 5GNR and / or LTE.

[0102] (Embodiment 2) Next, a second embodiment will be described. This embodiment differs from the first embodiment in that a parallel arm resonator is switchably connected to the acoustic wave resonator in addition to a series arm resonator. The following describes the second embodiment, focusing on the differences from the first embodiment, with reference to FIG. 3.

[0103] 3 is a circuit configuration diagram of a communication device 5A according to this embodiment. Note that FIG. 3 is an exemplary circuit configuration, and the communication device 5A may be implemented using any of a wide variety of circuit implementations and circuit technologies. Therefore, the description of the communication device 5A provided below should not be construed as limiting.

[0104] 3, the numbers marked with B next to the filters indicate the numbers that identify the LTE and / or 5G NR frequency bands, as in FIG. 1. The frequency bands shown in FIG. 3 are examples to facilitate understanding by those skilled in the art, and the frequency bands corresponding to each filter are not limited to those shown in FIG. 3.

[0105] [2.1 Circuit configuration of communication device 5A] First, the circuit configuration of a communication device 5A according to the present embodiment will be described with reference to Fig. 3. The communication device 5A includes a high-frequency circuit 1A, an antenna 2, an RFIC 3, and a BBIC 4. That is, the communication device 5A is similar to the communication device 5 according to the first embodiment, except that the communication device 5A includes a high-frequency circuit 1A instead of the high-frequency circuit 1.

[0106] [2.2. Circuit configuration of high-frequency circuit 1A] Next, the circuit configuration of a high-frequency circuit 1A according to this embodiment will be described with reference to Fig. 3. The high-frequency circuit 1A includes low-noise amplifiers 20 to 28, filters 30A, 31, 32, 33, 34, 35, 36, 37, and 38, a switch circuit 50, an antenna connection terminal 100, and high-frequency output terminals 120, 121, 122, 123, 124, 125, 126, 127, and 128. In other words, the high-frequency circuit 1A is similar to the high-frequency circuit 1 according to the first embodiment, except that it includes filter 30A instead of filter 30.

[0107] The filter 30A is an acoustic wave filter, and is a band-pass filter having a pass band that includes the reception band of the first band (B1) and the reception band of the second band (B66). One end of the filter 30A is connected to the input terminal of the low-noise amplifier 20, and the other end of the filter 30A is connected to selection terminals 501 and 502 of the switch circuit 50. Specifically, the filter 30A includes input terminals 301 and 302, an output terminal 303, series arm resonators 304 and 305, a switch circuit 306, an acoustic wave resonator 307A, and parallel arm resonators 308 and 309.

[0108] Parallel arm resonator 308 is an example of a first parallel arm acoustic wave resonator, and is connected between ground and a path connecting input terminal 301 and selection terminal 3061. Specifically, parallel arm resonator 308 corresponds to acoustic wave resonator P01 included in acoustic wave resonator 307 of the first embodiment.

[0109] Parallel arm resonator 309 is an example of a second parallel arm acoustic wave resonator, and is connected between ground and a path connecting input terminal 302 and selection terminal 3062. Specifically, parallel arm resonator 309 corresponds to acoustic wave resonator P01 included in acoustic wave resonator 307 of the first embodiment.

[0110] The acoustic wave resonator 307A is connected between a common terminal 3060 of the switch circuit 306 and the output terminal 303 of the filter 30A. The acoustic wave resonator 307A is selectively connected to a set of the series arm resonator 304 and the parallel arm resonator 308 and a set of the series arm resonator 305 and the parallel arm resonator 309 via the switch circuit 306. The resonant frequencies of the series arm resonators 304 and 305 and the anti-resonant frequencies of the parallel arm resonators 308 and 309 may be included in the passband of the filter 30A, thereby forming the passband of the filter 30A. Note that while an example of the implementation of the acoustic wave resonator 307A is not shown or described, the acoustic wave resonator 307A corresponds to the acoustic wave resonator 307 in FIG. 2 from which the acoustic wave resonator P01 is omitted. The acoustic wave resonator P01 is disposed on each of the substrates SB2 and SB3.

[0111] [2.3. Summary] As described above, the filter 30A according to the present embodiment may further include the parallel arm resonator 308 connected between the ground and a path connecting the input terminal 301 and the selection terminal 3061, and the parallel arm resonator 309 connected between the ground and a path connecting the input terminal 302 and the selection terminal 3062.

[0112] With this, in addition to the series arm resonators 304 and 305, the parallel arm resonators 308 and 309 are connected to the selection terminals 501 and 502 of the switch circuit 50 via the input terminals 301 and 302, respectively. This makes it possible to further suppress the deviation in impedance of other bands that can be simultaneously communicated when the filter 30A is viewed from the selection terminals 501 and 502 of the switch circuit 50, and to further suppress signal loss in other bands when simultaneously receiving signals of the first band and signals of the other band (for example, the third band) and when simultaneously receiving signals of the second band and signals of the other band (for example, the fourth band).

[0113] (Embodiment 3) Next, a third embodiment will be described. This embodiment differs from the first embodiment in that it is possible to switch between a first passband including the reception band of the first band and a second passband including the reception band of the second band. The following describes this embodiment, focusing on the differences from the first embodiment, with reference to FIG. 4.

[0114] 4 is a circuit configuration diagram of a communication device 5B according to this embodiment. Note that FIG. 4 is an exemplary circuit configuration, and the communication device 5B may be implemented using any of a wide variety of circuit implementations and circuit technologies. Therefore, the description of the communication device 5B provided below should not be construed as limiting.

[0115] In Fig. 4, the numbers marked with B next to the filters represent numbers that identify the frequency bands of LTE and / or 5G NR, similar to Fig. 1. The frequency bands shown in Fig. 4 are examples to facilitate understanding by those skilled in the art, and the frequency bands corresponding to each filter are not limited to those shown in Fig. 4.

[0116] 3.1 Circuit Configuration of Communication Device 5B First, the circuit configuration of a communication device 5B according to the present embodiment will be described with reference to Fig. 4. The communication device 5B includes a high-frequency circuit 1B, an antenna 2, an RFIC 3, and a BBIC 4. That is, the communication device 5B is similar to the communication device 5 according to the first embodiment, except that the communication device 5B includes a high-frequency circuit 1B instead of the high-frequency circuit 1.

[0117] [3.2. Circuit configuration of high-frequency circuit 1B] Next, the circuit configuration of a high-frequency circuit 1B according to this embodiment will be described with reference to Fig. 4. The high-frequency circuit 1B includes low-noise amplifiers 20B1, 20B2, 21, 22, 23, 24, 25, 26, 27, and 28, filters 30B, 31, 32, 33, 34, 35, 36, 37B, and 38B, a switch circuit 50B, an antenna connection terminal 100, and high-frequency output terminals 120B1, 120B2, 121, 122, 123, 124, 125, 126, 127, and 128.

[0118] Each of the radio-frequency output terminals 120B1 and 120B2 is an external connection terminal of the radio-frequency circuit 1B, and is connected to the RFIC 3 outside the radio-frequency circuit 1B. The radio-frequency output terminals 120B1 and 120B2 are also connected to the output ends of the low-noise amplifiers 20B1 and 20B2, respectively, inside the radio-frequency circuit 1B. This allows the radio-frequency circuit 1B to supply the ninth- and tenth-band reception signals amplified by the low-noise amplifiers 20B1 and 20B2 to the RFIC 3 via the radio-frequency output terminals 120B1 and 120B2, respectively.

[0119] The input terminals of the low-noise amplifiers 20B1 and 20B2 are connected to the filters 37B and 38B, respectively, and the output terminals of the low-noise amplifiers 20B1 and 20B2 are connected to the high-frequency output terminals 120B1 and 120B2, respectively, so that the low-noise amplifiers 20B1 and 20B2 can amplify the received signals of the 9th and 10th bands, respectively.

[0120] The low-noise amplifiers 20B1 and 20B2 may be configured with FETs and may be manufactured using semiconductor materials. Examples of the semiconductor materials that may be used include single crystal silicon, GaN, and SiC. The amplifying transistors of the low-noise amplifiers 20B1 and 20B2 are not limited to FETs. For example, some or all of the low-noise amplifiers 20B1 and 20B2 may be configured with bipolar transistors.

[0121] Note that some or all of the low-noise amplifiers 20B1 and 20B2 may not be included in the high-frequency circuit 1B. In this case, some or all of the low-noise amplifiers 20B1 and 20B2 may be connected between the high-frequency output terminals 120B1 and 120B2 and the RFIC 3, or may be included in the RFIC 3.

[0122] The filter 30B is an acoustic wave filter, and is a variable band-pass filter that can switch between a first pass band including the reception band of the first band (B7) and a second pass band including the reception band of the second band (B41). One end of the filter 30B is connected to the input terminals of the low-noise amplifiers 27 and 28, and the other end of the filter 30B is connected to the selection terminals 501B, 502B, and 503B of the switch circuit 50B.

[0123] In this embodiment, the first band may be Band 7 for LTE or n7 for 5GNR, but is not limited to this. Also, the second band may be Band 41 for LTE or n41 for 5GNR, but is not limited to this.

[0124] The filter 30B includes input terminals 301B, 302B, and 303B, output terminals 304B and 305B, series arm resonators 306B, 307B, and 308B, a switch circuit 309B, and acoustic wave resonators 310B and 311B.

[0125] The input terminal 301B is an example of a first input terminal, and is connected to a selection terminal 501B of the switch circuit 50B outside the filter 30B, and is connected to a series arm resonator 306B inside the filter 30B.

[0126] The input terminal 302B is an example of a second input terminal, and is connected to the selection terminal 502B of the switch circuit 50B outside the filter 30B, and is connected to the series arm resonator 307B inside the filter 30B.

[0127] The input terminal 303B is an example of a third input terminal, and is connected to a selection terminal 503B of the switch circuit 50B outside the filter 30B, and is connected to a series arm resonator 308B inside the filter 30B.

[0128] Output terminal 304B is connected to the input end of low noise amplifier 27 outside filter 30B, and is connected to acoustic wave resonator 310B inside filter 30B.

[0129] Output terminal 305B is connected to the input end of low-noise amplifier 28 outside filter 30B, and is connected to acoustic wave resonator 311B inside filter 30B.

[0130] Series arm resonator 306B is an example of a first series arm acoustic wave resonator, and is connected between input terminal 301B and switch circuit 309B.

[0131] Series arm resonator 307B is an example of a second series arm acoustic wave resonator, and is connected between input terminal 302B and switch circuit 309B.

[0132] Series arm resonator 308B is an example of a third series arm acoustic wave resonator, and is connected between input terminal 303B and switch circuit 309B.

[0133] The switch circuit 309B is an example of a first switch circuit and is connected between the series arm resonators 306B, 307B, and 308B and the acoustic wave resonators 310B and 311B. The switch circuit 309B includes common terminals 3091B and 3092B and selection terminals 3093B, 3094B, and 3095B. The common terminal 3091B is an example of a first common terminal and is connected to the acoustic wave resonator 310B. The common terminal 3092B is an example of a second common terminal and is connected to the acoustic wave resonator 311B. The selection terminal 3093B is an example of a first selection terminal and is connected to the series arm resonator 306B. The selection terminal 3094B is an example of a second selection terminal and is connected to the series arm resonator 307B. The selection terminal 3095B is an example of a third selection terminal and is connected to the series arm resonator 308B.

[0134] In such a connection configuration, the switch circuit 309B can connect the common terminals 3091B and 3092B to the selection terminals 3093B, 3094B, and 3095B, ​​for example, based on a control signal from the RFIC 3. The switch circuit 309B is configured, for example, as a DP3T (Double-Pole Triple-Throw) type switch circuit.

[0135] Acoustic wave resonator 310B is an example of a first acoustic wave resonator, and is connected between output terminal 304B and common terminal 3091B of switch circuit 309B. Acoustic wave resonator 310B is selectively connected to series arm resonators 306B, 307B, and 308B via switch circuit 309B. The resonant frequencies of series arm resonators 306B, 307B, and 308B may be included in a first passband, thereby forming the first passband of filter 30B.

[0136] Acoustic wave resonator 311B is an example of a second acoustic wave resonator, and is connected between output terminal 305B and common terminal 3092B of switch circuit 309B. Acoustic wave resonator 311B is selectively connected to series arm resonators 306B, 307B, and 308B via switch circuit 309B. The resonant frequencies of series arm resonators 306B, 307B, and 308B may be included in the second passband, thereby forming the second passband of filter 30B.

[0137] The filter 31 is an example of a first filter, and is a band-pass filter having a pass band that includes the reception band of the third band (B3). One end of the filter 31 is connected to the input terminal of the low-noise amplifier 21, and the other end of the filter 31 is connected to the selection terminal 501B of the switch circuit 50B.

[0138] The filter 32 is an example of a second filter, and is a band-pass filter having a pass band that includes the reception band of the fourth band (B25). One end of the filter 32 is connected to the input terminal of the low-noise amplifier 22, and the other end of the filter 32 is connected to the selection terminal 502B of the switch circuit 50B.

[0139] The filter 33 is an example of a fourth filter, and is a band-pass filter having a pass band that includes the reception band of the sixth band (B40). One end of the filter 33 is connected to the input terminal of the low-noise amplifier 23, and the other end of the filter 33 is connected to the selection terminal 501B of the switch circuit 50B. The filter 33 does not necessarily have to be included in the high-frequency circuit 1B.

[0140] The filter 34 is an example of a fifth filter, and is a bandpass filter having a passband that includes the reception band of the seventh band (B30). One end of the filter 34 is connected to the input terminal of the low-noise amplifier 24, and the other end of the filter 34 is connected to the selection terminal 502B of the switch circuit 50B. The filter 34 does not necessarily have to be included in the high-frequency circuit 1B.

[0141] The filter 35 is an example of a third filter, and is a band-pass filter having a pass band that includes the reception band of the fifth band (B34). One end of the filter 35 is connected to the input terminal of the low-noise amplifier 25, and the other end of the filter 35 is connected to the selection terminal 503B of the switch circuit 50B.

[0142] The filter 36 is an example of a sixth filter, and is a band-pass filter having a pass band that includes the reception band of the eighth band (B39). One end of the filter 36 is connected to the input terminal of the low-noise amplifier 26, and the other end of the filter 36 is connected to the selection terminal 503B of the switch circuit 50B. The filter 36 does not necessarily have to be included in the high-frequency circuit 1B.

[0143] The filter 37B is an example of a seventh filter, and is a band-pass filter having a pass band that includes the reception band of the ninth band (B1). One end of the filter 37B is connected to the input terminal of the low-noise amplifier 20B1, and the other end of the filter 37B is connected to the selection terminal 501B of the switch circuit 50B. The filter 37B does not necessarily have to be included in the high-frequency circuit 1B.

[0144] The filter 38B is an example of an eighth filter, and is a band-pass filter having a pass band that includes the reception band of the tenth band (B66). One end of the filter 38B is connected to the input terminal of the low-noise amplifier 20B2, and the other end of the filter 38B is connected to the selection terminal 502B of the switch circuit 50B. The filter 38B does not necessarily have to be included in the high-frequency circuit 1B.

[0145] In this embodiment, at least one of the combination of the first band and the third band and the combination of the second band and the third band is a band combination that allows simultaneous communication. As such a third band, Band 3 for LTE or n3 for 5GNR can be used, but the third band is not limited thereto.

[0146] In addition, at least one of the combination of the first band and the fourth band and the combination of the second band and the fourth band is a band combination that allows simultaneous communication. As such a fourth band, Band 25 for LTE or n25 for 5GNR can be used, but the fourth band is not limited to these.

[0147] In addition, at least one of the combination of the first band and the fifth band and the combination of the second band and the fifth band is a band combination that allows simultaneous communication. As such a fifth band, Band 40 for LTE or n40 for 5GNR can be used, but the fifth band is not limited thereto.

[0148] In addition, at least one of the combination of the first band and the sixth band and the combination of the second band and the sixth band is a band combination that allows simultaneous communication. As such a sixth band, Band 30 for LTE or n30 for 5GNR can be used, but the sixth band is not limited thereto.

[0149] In addition, at least one of the combination of the first band and the seventh band and the combination of the second band and the seventh band is a band combination that allows simultaneous communication. As such a seventh band, Band 34 for LTE or n34 for 5GNR can be used, but the seventh band is not limited thereto.

[0150] In addition, at least one of the combination of the first band and the eighth band and the combination of the second band and the eighth band is a band combination that allows simultaneous communication. As such an eighth band, Band 39 for LTE or n39 for 5GNR can be used, but the eighth band is not limited thereto.

[0151] In addition, at least one of the combination of the first band and the ninth band and the combination of the second band and the ninth band is a band combination that allows simultaneous communication. As such a ninth band, Band 1 for LTE or n1 for 5GNR can be used, but the ninth band is not limited thereto.

[0152] In addition, at least one of the combination of the first band and the tenth band and the combination of the second band and the tenth band is a band combination that allows simultaneous communication. As such a tenth band, Band 66 for LTE or n66 for 5GNR can be used, but the tenth band is not limited to these.

[0153] The switch circuit 50B is an example of a second switch circuit and is connected between the antenna connection terminal 100 and the filters 30B, 31 to 36, 37B, and 38B. Specifically, the switch circuit 50B includes a common terminal 500B and selection terminals 501B, 502B, and 503B. The common terminal 500B is an example of a third common terminal and is connected to the antenna connection terminal 100. The selection terminal 501B is an example of a fourth selection terminal and is connected to the filters 30B, 31, 33, and 37B. The selection terminal 502B is an example of a fifth selection terminal and is connected to the filters 30B, 32, 34, and 38B. The selection terminal 503B is an example of a sixth selection terminal and is connected to the filters 30B, 35, and 36.

[0154] In such a connection configuration, the switch circuit 50B can exclusively connect the common terminal 500B to the selection terminals 501B to 503B, for example, based on a control signal from the RFIC 3. The switch circuit 50B is configured, for example, as an SP3T (Single-Pole Triple-Throw) type switch circuit.

[0155] [3.3. Summary] As described above, filter 30B according to this embodiment is a filter 30B that can switch between a first pass band including the reception band of the first band and a second pass band including the reception band of the second band, and includes input terminals 301B, 302B, and 303B, output terminals 304B and 305B, switch circuit 309B including common terminals 3091B and 3092B and selection terminals 3093B, 3094B, and 3095B, ​​and selection terminals 3093B and a series arm resonator 306B connected between the selection terminal 3094B and the input terminal 302B; a series arm resonator 307B connected between the selection terminal 3095B and the input terminal 303B; an acoustic wave resonator 310B connected between the common terminal 3091B and the output terminal 304B; and an acoustic wave resonator 311B connected between the common terminal 3092B and the output terminal 305B.

[0156] This allows input terminals 301B, 302B, and 303B of filter 30B to be connected to three selection terminals to which other filters are connected, respectively, thereby reducing the number of selection terminals of switch circuit 50B. This reduces the off-capacitance of switch circuit 50B. Furthermore, series arm resonators 306B, 307B, and 308B can be connected to selection terminals 501B, 502B, and 503B of switch circuit 50B via input terminals 301B, 302B, and 303B, respectively. This facilitates adjustment of the impedance of other bands that can be simultaneously communicated with the first or second band when filter 30B is viewed from the selection terminal of switch circuit 50B. This reduces signal loss in other bands when simultaneously receiving signals in the first or second band and signals in other bands (e.g., the third, fourth, or fifth band).

[0157] Furthermore, for example, in the filter 30B according to this embodiment, the resonant frequency of the series arm resonator 306B may be included in the first pass band and the second pass band of the filter 30B.

[0158] This allows the series arm resonator 306B to be used to form the passband of the filter 30B, and the number of resonators can be reduced compared to when the series arm resonator 306B is used simply for impedance adjustment.

[0159] Furthermore, for example, in the filter 30B according to the present embodiment, the resonant frequency of the series arm resonator 307B may be included in the first pass band and the second pass band of the filter 30B.

[0160] This allows the series arm resonator 307B to be used to form the passband of the filter 30B, and the number of resonators can be reduced compared to when the series arm resonator 307B is used simply for impedance adjustment.

[0161] Furthermore, for example, in the filter 30B according to this embodiment, the resonant frequency of the series arm resonator 308B may be included in the first pass band and the second pass band of the filter 30B.

[0162] This allows the series arm resonator 308B to be used to form the passband of the filter 30B, and the number of resonators can be reduced compared to when the series arm resonator 308B is used simply for impedance adjustment.

[0163] Moreover, the high-frequency circuit 1B according to this embodiment includes a filter 30B, a filter 31 having a pass band including the reception band of the third band, a filter 32 having a pass band including the reception band of the fourth band, a filter 35 having a pass band including the reception band of the fifth band, and a switch circuit 50B including a common terminal 500B connected to the antenna connection terminal 100 and selection terminals 501B, 502B, and 503B, the selection terminal 501B is connected to an input terminal 301B of the filter 30B and is also connected to the filter 31, the selection terminal 502B is connected to an input terminal 302B of the filter 30B, and and is connected to filter 32, selection terminal 503B is connected to input terminal 303B of filter 30B and is also connected to filter 35, at least one of the combination of the first band and the third band and the combination of the second band and the third band is a band combination that allows simultaneous communication, at least one of the combination of the first band and the fourth band and the combination of the second band and the fourth band is a band combination that allows simultaneous communication, and at least one of the combination of the first band and the fifth band and the combination of the second band and the fifth band is a band combination that allows simultaneous communication.

[0164] According to this, three input terminals 301B, 302B, and 303B of filter 30B are connected to three selection terminals 501B, 502B, and 503B, respectively, to which filters 31, 32, and 35 are connected, and the selection terminals to which filters 37 and 38 of the first embodiment are connected are omitted. This allows the number of selection terminals of switch circuit 50B to be reduced, and the off-capacitance of switch circuit 50B to be reduced. Furthermore, series arm resonators 306B, 307B, and 308B are connected to selection terminals 501B, 502B, and 503B of switch circuit 50B via input terminals 301B, 302B, and 303B, respectively. This makes it easy to adjust the impedances of the third band, fourth band, and fifth band when viewing the filter 30B from the selection terminals 501B, 502B, and 503B of the switch circuit 50B, and it is possible to suppress signal loss in the third band, fourth band, and fifth band when receiving a signal of the first band or second band and a signal of each of the third band, fourth band, and fifth band simultaneously.

[0165] Furthermore, for example, the high-frequency circuit 1B according to this embodiment may further include a filter 33 connected to the selection terminal 501B and having a passband that includes the reception band of the sixth band, a filter 34 connected to the selection terminal 502B and having a passband that includes the reception band of the seventh band, and a filter 36 connected to the selection terminal 503B and having a passband that includes the reception band of the eighth band, and at least one of the combination of the first band and the sixth band and the combination of the second band and the sixth band may be a band combination that allows simultaneous communication, at least one of the combination of the first band and the seventh band and the combination of the second band and the seventh band may be a band combination that allows simultaneous communication, and at least one of the combination of the first band and the eighth band and the combination of the second band and the eighth band may be a band combination that allows simultaneous communication.

[0166] This makes it easy to adjust the impedances of the sixth, seventh, and eighth bands when viewing the filter 30B from the selection terminals 501B, 502B, and 503B of the switch circuit 50B, and it is possible to suppress signal loss in the sixth, seventh, and eighth bands when receiving a signal of the first or second band and a signal of each of the sixth, seventh, and eighth bands simultaneously.

[0167] For example, the high-frequency circuit 1B according to this embodiment may further include a filter 37B connected to the selection terminal 501B and having a pass band including the reception band of the ninth band, and a filter 38B connected to the selection terminal 502B and having a pass band including the reception band of the tenth band, and at least one of the combination of the first band and the ninth band and the combination of the second band and the ninth band may be a band combination that allows simultaneous communication, and at least one of the combination of the first band and the tenth band and the combination of the second band and the tenth band may be a band combination that allows simultaneous communication.

[0168] This makes it easy to adjust the impedance of the ninth and tenth bands when viewing the filter 30B from the selection terminals 501B and 502B of the switch circuit 50B, and makes it possible to suppress signal loss in the ninth and tenth bands when receiving a signal of the first or second band and a signal of each of the ninth and tenth bands simultaneously.

[0169] For example, in the high-frequency circuit 1B according to the present embodiment, the first band may be Band 7 for LTE or n7 for 5GNR, the second band may be Band 41 for LTE or n41 for 5GNR, the third band may be Band 3 for LTE or n3 for 5GNR, the fourth band may be Band 25 for LTE or n25 for 5GNR, the fifth band may be Band 34 for LTE or n34 for 5GNR, the sixth band may be Band 40 for LTE or n40 for 5GNR, the seventh band may be Band 30 for LTE or n30 for 5GNR, the eighth band may be Band 39 for LTE or n39 for 5GNR, the ninth band may be Band 1 for LTE or n1 for 5GNR, and the tenth band may be Band 66 for LTE or n66 for 5GNR.

[0170] This allows it to support 5GNR and / or LTE.

[0171] (Fourth embodiment) Next, a fourth embodiment will be described. This embodiment differs from the third embodiment in that a parallel arm resonator is switchably connected to the acoustic wave resonator in addition to a series arm resonator. The following describes the fourth embodiment, focusing on the differences from the third embodiment, with reference to FIG. 5.

[0172] 5 is a circuit configuration diagram of a communication device 5C according to this embodiment. Note that FIG. 5 is an exemplary circuit configuration, and the communication device 5C may be implemented using any of a wide variety of circuit implementations and circuit technologies. Therefore, the description of the communication device 5C provided below should not be construed as limiting.

[0173] 5, the numbers marked with B next to the filters indicate the numbers that identify the frequency bands of LTE and / or 5G NR, similar to Fig. 1. The frequency bands shown in Fig. 5 are examples to facilitate understanding by those skilled in the art, and the frequency bands corresponding to each filter are not limited to those shown in Fig. 5.

[0174] [4.1 Circuit configuration of communication device 5C] First, the circuit configuration of a communication device 5C according to the present embodiment will be described with reference to Fig. 5. The communication device 5C includes a high-frequency circuit 1C, an antenna 2, an RFIC 3, and a BBIC 4. That is, the communication device 5C is similar to the communication device 5B according to the third embodiment, except that the communication device 5C includes a high-frequency circuit 1C instead of the high-frequency circuit 1B.

[0175] [4.2. Circuit configuration of high frequency circuit 1C] Next, the circuit configuration of a high-frequency circuit 1C according to the present embodiment will be described with reference to Fig. 5. The high-frequency circuit 1C includes low-noise amplifiers 20B1, 20B2, 21, 22, 23, 24, 25, 26, 27, and 28, filters 30C, 31, 32, 33, 34, 35, 36, 37B, and 38B, a switch circuit 50B, an antenna connection terminal 100, and high-frequency output terminals 120B1, 120B2, 121, 122, 123, 124, 125, 126, 127, and 128. In other words, the high-frequency circuit 1C is similar to the high-frequency circuit 1B according to the third embodiment, except that it includes filter 30C instead of filter 30B.

[0176] The filter 30C is an acoustic wave filter and a variable band-pass filter that can switch between a first pass band including the reception band of the first band (B7) and a second pass band including the reception band of the second band (B41). One end of the filter 30C is connected to the input terminals of the low-noise amplifiers 27 and 28, and the other end of the filter 30C is connected to selection terminals 501B, 502B, and 503B of the switch circuit 50B. Specifically, the filter 30C includes input terminals 301B, 302B, and 303B, output terminals 304B and 305B, series arm resonators 306B, 307B, and 308B, a switch circuit 309B, acoustic wave resonators 310C and 311C, and parallel arm resonators 312C, 313C, and 314C.

[0177] The parallel arm resonator 312C is an example of a first parallel arm acoustic wave resonator, and is connected between the path connecting the input terminal 301B and the selection terminal 3093B and the ground.

[0178] The parallel arm resonator 313C is an example of a second parallel arm acoustic wave resonator, and is connected between the path connecting the input terminal 302B and the selection terminal 3094B and the ground.

[0179] The parallel arm resonator 314C is an example of a third parallel arm acoustic wave resonator, and is connected between the path connecting the input terminal 303B and the selection terminal 3095B and the ground.

[0180] The acoustic wave resonator 310C is an example of a first acoustic wave resonator and is connected between the output terminal 304B and a common terminal 3091B of the switch circuit 309B. The acoustic wave resonator 310C is selectively connected to a set of the series arm resonator 306B and the parallel arm resonator 312C, a set of the series arm resonator 307B and the parallel arm resonator 313C, and a set of the series arm resonator 308B and the parallel arm resonator 314C via the switch circuit 309B. The resonant frequencies of the series arm resonators 306B, 307B, and 308B and the anti-resonant frequencies of the parallel arm resonators 312C, 313C, and 314C may be included in a first passband, thereby forming the first passband of the filter 30C.

[0181] The acoustic wave resonator 311C is an example of a second acoustic wave resonator and is connected between the output terminal 305B and a common terminal 3092B of the switch circuit 309B. The acoustic wave resonator 311C is selectively connected to a set of the series arm resonator 306B and the parallel arm resonator 312C, a set of the series arm resonator 307B and the parallel arm resonator 313C, and a set of the series arm resonator 308B and the parallel arm resonator 314C via the switch circuit 309B. The resonant frequencies of the series arm resonators 306B, 307B, and 308B and the anti-resonant frequencies of the parallel arm resonators 312C, 313C, and 314C may be included in a second passband, thereby forming a second passband of the filter 30C.

[0182] [4.3. Summary] Furthermore, for example, the filter 30C according to the present embodiment may further include a parallel arm resonator 312C connected between the ground and a path connecting the input terminal 301B and the selection terminal 3093B, a parallel arm resonator 313C connected between the ground and a path connecting the input terminal 302B and the selection terminal 3094B, and a parallel arm resonator 314C connected between the ground and a path connecting the input terminal 303B and the selection terminal 3095B.

[0183] With this, in addition to the series arm resonators 306B, 307B, and 308B, the parallel arm resonators 312C, 313C, and 314C are connected to the selection terminals 501B, 502B, and 503B of the switch circuit 50B via the input terminals 301B, 302B, and 303B, respectively. This makes it possible to further suppress the deviation in impedance of other bands that can be simultaneously communicated when the filter 30C is viewed from the selection terminals 501B, 502B, and 503B of the switch circuit 50B, and to further suppress signal loss in other bands when a signal of the first band or the second band and a signal of each other band (e.g., the third band, the fourth band, and the fifth band) are simultaneously received.

[0184] (Other embodiments) Although the acoustic wave filter and high-frequency circuit according to the present invention have been described above based on the embodiments, the acoustic wave filter and high-frequency circuit according to the present invention are not limited to the above embodiments. The present invention also includes other embodiments realized by combining any of the components in the above embodiments, modifications obtained by applying various modifications to the above embodiments that would occur to those skilled in the art without departing from the spirit of the present invention, and various devices incorporating the above acoustic wave filter or the above high-frequency circuit.

[0185] For example, in the circuit configurations of the various circuits according to the above embodiments, other circuit elements and wiring may be inserted between the paths connecting the circuit elements and signal paths disclosed in the drawings. Specifically, an impedance matching circuit may be inserted between the low-noise amplifier and the filter and / or between the filter and the switch circuit. The impedance matching circuit may be configured, for example, with an inductor and / or a capacitor, but is not limited thereto.

[0186] The high-frequency circuits according to the above embodiments may include a transmission path.

[0187] The characteristics of the acoustic wave filters and high-frequency circuits described based on the above embodiments will be described below.

[0188] <1> An acoustic wave filter having a passband including a first reception band and a second reception band, a first input terminal and a second input terminal; An output terminal; a first switch circuit including a first common terminal, a first selection terminal, and a second selection terminal; a first series arm acoustic wave resonator connected between the first selection terminal and the first input terminal; a second series arm acoustic wave resonator connected between the second selection terminal and the second input terminal; an acoustic wave resonator connected between the first common terminal and the output terminal; Acoustic wave filters.

[0189] <2> a resonant frequency of the first series arm acoustic wave resonator is included in the pass band of the acoustic wave filter; <1> The acoustic wave filter according to claim 1.

[0190] <3> a resonant frequency of the second series arm acoustic wave resonator is included in the pass band of the acoustic wave filter. <2> The acoustic wave filter according to claim 1.

[0191] <4> The acoustic wave filter further comprises: a first parallel arm acoustic wave resonator connected between a path connecting the first input terminal and the first selection terminal and ground; a second parallel arm acoustic wave resonator connected between a path connecting the second input terminal and the second selection terminal and ground, <1> ~ <3> 10. The acoustic wave filter according to claim 9, wherein:

[0192] <5> <1> ~ <4> an acoustic wave filter according to any one of the preceding items; a first filter having a passband that includes the receive band of the third band; a second filter having a passband that includes the fourth band receiving band; a second switch circuit including a second common terminal connected to the antenna connection terminal, a third selection terminal, and a fourth selection terminal; the third selection terminal is connected to the first input terminal of the acoustic wave filter and to the first filter; the fourth selection terminal is connected to the second input terminal of the acoustic wave filter and to the second filter; a combination of the first band and the third band is a band combination that allows simultaneous communication; The combination of the second band and the fourth band is a band combination that allows simultaneous communication. High frequency circuits.

[0193] <6> The high-frequency circuit further comprises: a third filter connected to the third selection terminal and having a passband including a reception band of a fifth band; a fourth filter connected to the fourth selection terminal and having a pass band including a reception band of a sixth band; a combination of the first band and the fifth band is a band combination that allows simultaneous communication; The combination of the second band and the sixth band is a band combination that allows simultaneous communication. <5> The high-frequency circuit according to claim 1.

[0194] <7> the second switch circuit further includes a fifth selection terminal; The high-frequency circuit further comprises: a fifth filter connected to the fifth selection terminal and having a passband including a reception band of the seventh band; a sixth filter connected to the fifth selection terminal and having a pass band including a reception band of the eighth band; The combination of the seventh band and the eighth band is a band combination that allows simultaneous communication. <6> The high-frequency circuit according to claim 1.

[0195] <8> the second switch circuit further includes a sixth selection terminal; the high-frequency circuit further includes a seventh filter connected to the sixth selection terminal and having a passband including a ninth band reception band; The combination of the first band and the ninth band and the combination of the second band and the ninth band are band combinations that enable simultaneous communication. <7> The high-frequency circuit according to claim 1.

[0196] <9> the second switch circuit further includes a seventh selection terminal; the high-frequency circuit further includes an eighth filter connected to the seventh selection terminal and having a passband including a reception band of a tenth band; The combination of the first band and the tenth band, and the combination of the second band and the tenth band are band combinations that enable simultaneous communication. <8> The high-frequency circuit according to claim 1.

[0197] <10> The first band is Band1 for LTE or n1 for 5GNR; The second band is Band 66 for LTE or n66 for 5GNR, The third band is Band 3 for LTE or n3 for 5GNR, The fourth band is Band 25 for LTE or n25 for 5GNR, The fifth band is Band 40 for LTE or n40 for 5GNR, The sixth band is Band 30 for LTE or n30 for 5GNR, The seventh band is Band 34 for LTE or n34 for 5GNR, The eighth band is Band 39 for LTE or n39 for 5GNR, The ninth band is Band 7 for LTE or n7 for 5GNR, The 10th band is Band 41 for LTE or n41 for 5GNR, <9> The high-frequency circuit according to claim 1.

[0198] <11> An acoustic wave filter capable of switching between a first pass band including a reception band of a first band and a second pass band including a reception band of a second band, a first input terminal, a second input terminal, and a third input terminal; a first output terminal and a second output terminal; a first switch circuit including a first common terminal, a second common terminal, a first selection terminal, a second selection terminal, and a third selection terminal; a first series arm acoustic wave resonator connected between the first selection terminal and the first input terminal; a second series arm acoustic wave resonator connected between the second selection terminal and the second input terminal; a third series arm acoustic wave resonator connected between the third selection terminal and the third input terminal; a first acoustic wave resonator connected between the first common terminal and the first output terminal; a second acoustic wave resonator connected between the second common terminal and the second output terminal, Acoustic wave filters.

[0199] <12> a resonant frequency of the first series arm acoustic wave resonator is included in the first pass band and the second pass band of the acoustic wave filter; <11> The acoustic wave filter according to claim 1.

[0200] <13> a resonant frequency of the second series arm acoustic wave resonator is included in the first pass band and the second pass band of the acoustic wave filter; <12> The acoustic wave filter according to claim 1.

[0201] <14> a resonant frequency of the third series arm acoustic wave resonator is included in the first pass band and the second pass band of the acoustic wave filter; <13> The acoustic wave filter according to claim 1.

[0202] <15> The acoustic wave filter further comprises: a first parallel arm acoustic wave resonator connected between a path connecting the first input terminal and the first selection terminal and ground; a second parallel arm acoustic wave resonator connected between a path connecting the second input terminal and the second selection terminal and ground; a third parallel arm acoustic wave resonator connected between a path connecting the third input terminal and the third selection terminal and ground, <11> ~ <14> 10. The acoustic wave filter according to claim 9, wherein:

[0203] <16> <11> ~ <15> an acoustic wave filter according to any one of the preceding items; a first filter having a passband that includes the receive band of the third band; a second filter having a passband that includes the fourth band receiving band; a third filter having a passband including the fifth band reception band; a second switch circuit including a third common terminal connected to the antenna connection terminal, and a fourth selection terminal, a fifth selection terminal, and a sixth selection terminal; the fourth selection terminal is connected to the first input terminal of the acoustic wave filter and to the first filter; the fifth selection terminal is connected to the second input terminal of the acoustic wave filter and to the second filter; the sixth selection terminal is connected to the third input terminal of the acoustic wave filter and to the third filter; at least one of the combination of the first band and the third band and the combination of the second band and the third band is a band combination that allows simultaneous communication; at least one of the combination of the first band and the fourth band and the combination of the second band and the fourth band is a band combination that allows simultaneous communication; At least one of the combination of the first band and the fifth band and the combination of the second band and the fifth band is a band combination that allows simultaneous communication. High frequency circuits.

[0204] <17> The high-frequency circuit further comprises: a fourth filter connected to the fourth selection terminal and having a passband including a receive band of the sixth band; a fifth filter connected to the fifth selection terminal and having a passband including a reception band of the seventh band; a sixth filter connected to the sixth selection terminal and having a passband including a reception band of the eighth band; at least one of the combination of the first band and the sixth band and the combination of the second band and the sixth band is a band combination that allows simultaneous communication; at least one of the combination of the first band and the seventh band and the combination of the second band and the seventh band is a band combination that allows simultaneous communication; At least one of the combination of the first band and the eighth band and the combination of the second band and the eighth band is a band combination that allows simultaneous communication. <16> The high-frequency circuit according to claim 1.

[0205] <18> The high-frequency circuit further comprises: a seventh filter connected to the fourth selection terminal and having a passband including a reception band of the ninth band; an eighth filter connected to the fifth selection terminal and having a passband including a reception band of the tenth band; at least one of the combination of the first band and the ninth band and the combination of the second band and the ninth band is a band combination that allows simultaneous communication; At least one of the combination of the first band and the tenth band and the combination of the second band and the tenth band is a band combination that allows simultaneous communication. <17> The high-frequency circuit according to claim 1.

[0206] <19> The first band is Band 7 for LTE or n7 for 5GNR; The second band is Band 41 for LTE or n41 for 5GNR, The third band is Band 3 for LTE or n3 for 5GNR, The fourth band is Band 25 for LTE or n25 for 5GNR, The fifth band is Band 40 for LTE or n40 for 5GNR, The sixth band is Band 30 for LTE or n30 for 5GNR, The seventh band is Band 34 for LTE or n34 for 5GNR, The eighth band is Band 39 for LTE or n39 for 5GNR, The 9th band is Band1 for LTE or n1 for 5GNR, The 10th band is Band 66 for LTE or n66 for 5GNR, <18> The high-frequency circuit according to claim 1. [Industrial Applicability]

[0207] The present invention can be widely used as an acoustic wave filter and a high-frequency circuit disposed in a front end portion of communication devices such as mobile phones. [Explanation of symbols]

[0208] 1, 1A, 1B, 1C High frequency circuit 2 antennas 3 RFIC 4. BBIC 5, 5A, 5B, 5C communication equipment 20, 20B1, 20B2, 21, 22, 23, 24, 25, 26, 27, 28 Low noise amplifier 30, 30A, 30B, 30C, 31, 32, 33, 34, 35, 36, 37, 37B, 38, 38B Filters 50, 50B, 306, 309B Switch circuit 100 Antenna connection terminal 120, 120B1, 120B2, 121, 122, 123, 124, 125, 126, 127, 128 High frequency output terminals 301, 301B, 302, 302B, 303B input terminals 303, 304B, 305B output terminals 304, 305, 306B, 307B, 308B series arm resonators 307, 307A, 310B, 310C, 311B, 311C Acoustic Wave Resonators 308, 309, 312C, 313C, 314C parallel arm resonators 500, 500B, 3060, 3091B, 3092B common terminal 501, 501B, 502, 502B, 503, 503B, 504, 505, 3061, 3062, 3093B, 3094B, 3095B selection terminal

Claims

1. An acoustic wave filter having a pass band including a first reception band and a second reception band, a first input terminal and a second input terminal; An output terminal; a first switch circuit including a first common terminal, a first selection terminal, and a second selection terminal; a first series arm acoustic wave resonator connected between the first selection terminal and the first input terminal; a second series arm acoustic wave resonator connected between the second selection terminal and the second input terminal; an acoustic wave resonator connected between the first common terminal and the output terminal, Acoustic wave filters.

2. a resonant frequency of the first series arm acoustic wave resonator is included in the pass band of the acoustic wave filter. The acoustic wave filter according to claim 1 .

3. a resonant frequency of the second series arm acoustic wave resonator is included in the pass band of the acoustic wave filter. The acoustic wave filter according to claim 2 .

4. The acoustic wave filter further comprises: a first parallel arm acoustic wave resonator connected between a path connecting the first input terminal and the first selection terminal and ground; a second parallel arm acoustic wave resonator connected between a path connecting the second input terminal and the second selection terminal and ground, The acoustic wave filter according to any one of claims 1 to 3.

5. an acoustic wave filter according to any one of claims 1 to 3; a first filter having a passband that includes the receive band of the third band; a second filter having a passband that includes the fourth band receiving band; a second switch circuit including a second common terminal connected to the antenna connection terminal, a third selection terminal, and a fourth selection terminal; the third selection terminal is connected to the first input terminal of the acoustic wave filter and to the first filter; the fourth selection terminal is connected to the second input terminal of the acoustic wave filter and to the second filter; a combination of the first band and the third band is a band combination that allows simultaneous communication; a combination of the second band and the fourth band is a band combination that allows simultaneous communication; High frequency circuits.

6. The high-frequency circuit further comprises: a third filter connected to the third selection terminal and having a passband including a reception band of a fifth band; a fourth filter connected to the fourth selection terminal and having a pass band including a reception band of a sixth band; a combination of the first band and the fifth band is a band combination that allows simultaneous communication, The combination of the second band and the sixth band is a band combination that allows simultaneous communication. The high frequency circuit according to claim 5.

7. the second switch circuit further includes a fifth selection terminal; The high-frequency circuit further comprises: a fifth filter connected to the fifth selection terminal and having a passband including a seventh band reception band; a sixth filter connected to the fifth selection terminal and having a pass band including a reception band of an eighth band; The combination of the seventh band and the eighth band is a band combination that allows simultaneous communication. The high frequency circuit according to claim 6.

8. the second switch circuit further includes a sixth selection terminal; the high-frequency circuit further includes a seventh filter connected to the sixth selection terminal and having a pass band including a ninth band reception band; the combination of the first band and the ninth band and the combination of the second band and the ninth band are band combinations that enable simultaneous communication; The high frequency circuit according to claim 7.

9. the second switch circuit further includes a seventh selection terminal; the high-frequency circuit further includes an eighth filter connected to the seventh selection terminal and having a passband including a reception band of a tenth band; The combination of the first band and the tenth band and the combination of the second band and the tenth band are band combinations that enable simultaneous communication. The high frequency circuit according to claim 8.

10. The first band is Band 1 for LTE or n1 for 5G NR; The second band is Band 66 for LTE or n66 for 5G NR, The third band is Band 3 for LTE or n3 for 5G NR; The fourth band is Band 25 for LTE or n25 for 5GNR; The fifth band is Band 40 for LTE or n40 for 5GNR, The sixth band is Band 30 for LTE or n30 for 5G NR, The seventh band is Band 34 for LTE or n34 for 5G NR, The eighth band is Band 39 for LTE or n39 for 5GNR; The ninth band is Band 7 for LTE or n7 for 5G NR; The 10th band is Band 41 for LTE or n41 for 5G NR; The high frequency circuit according to claim 9.

11. An acoustic wave filter capable of switching between a first pass band including a first reception band and a second pass band including a second reception band, a first input terminal, a second input terminal, and a third input terminal; a first output terminal and a second output terminal; a first switch circuit including a first common terminal, a second common terminal, a first selection terminal, a second selection terminal, and a third selection terminal; a first series arm acoustic wave resonator connected between the first selection terminal and the first input terminal; a second series arm acoustic wave resonator connected between the second selection terminal and the second input terminal; a third series arm acoustic wave resonator connected between the third selection terminal and the third input terminal; a first acoustic wave resonator connected between the first common terminal and the first output terminal; a second acoustic wave resonator connected between the second common terminal and the second output terminal. Acoustic wave filters.

12. a resonant frequency of the first series arm acoustic wave resonator is included in the first pass band and the second pass band of the acoustic wave filter. The acoustic wave filter according to claim 11 .

13. a resonant frequency of the second series arm acoustic wave resonator is included in the first pass band and the second pass band of the acoustic wave filter. The acoustic wave filter according to claim 12 .

14. a resonant frequency of the third series arm acoustic wave resonator is included in the first pass band and the second pass band of the acoustic wave filter. The acoustic wave filter according to claim 13 .

15. The acoustic wave filter further comprises: a first parallel arm acoustic wave resonator connected between a path connecting the first input terminal and the first selection terminal and ground; a second parallel arm acoustic wave resonator connected between a path connecting the second input terminal and the second selection terminal and ground; a third parallel arm acoustic wave resonator connected between a path connecting the third input terminal and the third selection terminal and ground, The acoustic wave filter according to any one of claims 11 to 14.

16. An acoustic wave filter according to any one of claims 11 to 14, a first filter having a passband that includes the receive band of the third band; a second filter having a passband that includes the fourth band receiving band; a third filter having a passband including the fifth band receiving band; a second switch circuit including a third common terminal connected to the antenna connection terminal, and a fourth selection terminal, a fifth selection terminal, and a sixth selection terminal; the fourth selection terminal is connected to the first input terminal of the acoustic wave filter and to the first filter; the fifth selection terminal is connected to the second input terminal of the acoustic wave filter and to the second filter; the sixth selection terminal is connected to the third input terminal of the acoustic wave filter and to the third filter; at least one of the combination of the first band and the third band and the combination of the second band and the third band is a band combination that allows simultaneous communication; at least one of the combination of the first band and the fourth band and the combination of the second band and the fourth band is a band combination that allows simultaneous communication; At least one of the combination of the first band and the fifth band and the combination of the second band and the fifth band is a band combination that allows simultaneous communication. High frequency circuits.

17. The high-frequency circuit further comprises: a fourth filter connected to the fourth selection terminal and having a passband including a receive band of a sixth band; a fifth filter connected to the fifth selection terminal and having a passband including a seventh band reception band; a sixth filter connected to the sixth selection terminal and having a pass band including a reception band of an eighth band; at least one of the combination of the first band and the sixth band and the combination of the second band and the sixth band is a band combination that allows simultaneous communication; at least one of the combination of the first band and the seventh band and the combination of the second band and the seventh band is a band combination that allows simultaneous communication; At least one of the combination of the first band and the eighth band and the combination of the second band and the eighth band is a band combination that allows simultaneous communication. The high frequency circuit according to claim 16.

18. The high-frequency circuit further comprises: a seventh filter connected to the fourth selection terminal and having a pass band including a receive band of the ninth band; an eighth filter connected to the fifth selection terminal and having a pass band including a receive band of the tenth band; at least one of the combination of the first band and the ninth band and the combination of the second band and the ninth band is a band combination that allows simultaneous communication; At least one of the combination of the first band and the tenth band and the combination of the second band and the tenth band is a band combination that allows simultaneous communication. The high frequency circuit according to claim 17.

19. The first band is Band 7 for LTE or n7 for 5G NR; The second band is Band 41 for LTE or n41 for 5G NR, The third band is Band 3 for LTE or n3 for 5G NR; The fourth band is Band 25 for LTE or n25 for 5GNR; The fifth band is Band 34 for LTE or n34 for 5GNR, The sixth band is Band 40 for LTE or n40 for 5G NR, The seventh band is Band 30 for LTE or n30 for 5G NR, The eighth band is Band 39 for LTE or n39 for 5GNR; The ninth band is Band 1 for LTE or n1 for 5G NR; The tenth band is Band 66 for LTE or n66 for 5G NR; The high frequency circuit according to claim 18.

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