High frequency module and communication device

Abstract

Provided is a high-frequency module and a communication device that can further suppress a decrease in reception sensitivity. A high-frequency module (1) includes a switch (second switch 5b), a reception filter (second reception filter 4), a low-noise amplifier (second low-noise amplifier 8b), and a filter (second filter 7). The switch switches a transmission path of a transmission signal and a reception path of a reception signal in a time-division multiplexing-based communication. The reception filter is disposed at a stage subsequent to the switch and passes a reception signal of a given frequency band. The low-noise amplifier amplifies the reception signal that has passed through the reception filter. The filter is disposed at a stage anterior to the switch in the reception path (second reception path R2).

Description

TECHNICAL FIELD

[0001] The present application relates to a high-frequency module and a communication device, and more particularly to a high-frequency module and a communication device that perform communication based on a time division multiplexing scheme. BACKGROUND

[0002] Conventionally, a high-frequency front-end circuit (high-frequency module) capable of suppressing a decrease in reception sensitivity is known (see Patent Literature 1).

[0003] The high-frequency front-end circuit of Patent Literature 1 has a transmission circuit and a reception circuit, and performs transmission and reception at the same time. The transmission circuit has a transmission filter that passes a signal of a transmission band. The reception circuit has a reception filter that passes a signal of a reception band different from the transmission band, a low-noise amplifier that inputs and amplifies a signal output from the reception filter, and a filter circuit connected between the reception filter and the low-noise amplifier. The filter circuit attenuates a signal of a frequency that shows a difference between a center frequency of the transmission band and a center frequency of the reception band, among signals input to the low-noise amplifier.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2019-29700 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In the structure of the high-frequency front-end circuit (high-frequency module), a switch that switches a path of a signal is sometimes provided at a stage preceding a reception filter or a transceiver filter that passes a reception signal of a given band. In this case, a harmonic of a signal of a band lower than the reception band is generated due to a non-linear characteristic of the switch. Therefore, the reception signal passes through the reception filter, and thus the reception sensitivity can decrease. In the high-frequency front-end circuit (high-frequency module) of Patent Literature 1, the harmonic generated due to the switching operation of the switch cannot be removed. In such a case, the reception sensitivity decreases in the high-frequency front-end circuit (high-frequency module) of Patent Literature 1.

[0009] The present application has been achieved in view of the above-described problems, and aims to provide a high-frequency module and a communication device capable of further suppressing a decrease in reception sensitivity.

[0010] TECHNICAL SOLUTION FOR SOLVING THE PROBLEMS

[0011] One embodiment of the present application relates to a high-frequency module including a switch, a reception filter, a low-noise amplifier, and a filter. The switch switches a transmission path of a transmission signal and a reception path of a reception signal in communication based on a time division multiplexing scheme. The reception filter is provided at a stage subsequent to the switch and passes the reception signal of a given frequency band. The low-noise amplifier amplifies the reception signal that has passed through the reception filter. The filter is provided at a stage anterior to the switch in the reception path.

[0012] One embodiment of the present application relates to a high-frequency module including a switch, a transceiving filter, a low-noise amplifier, and a filter. The switch switches a connection destination of an antenna terminal. The transceiving filter is provided at a stage subsequent to the switch and passes a reception signal of a given frequency band and a transmission signal of the given frequency band. The low-noise amplifier amplifies the reception signal that has passed through the transceiving filter. The filter is provided at a stage anterior to the switch in a reception path of the reception signal.

[0013] One embodiment of the present application relates to a communication device including the high-frequency module and a signal processing circuit that performs signal processing on a signal that has passed through the high-frequency module.

[0014] Effects of Invention

[0015] According to the present application, it is possible to further suppress a decrease in reception sensitivity. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a circuit diagram illustrating a circuit structure of the high-frequency module and the communication device according to Embodiment 1.

[0017] Figure 2 is a diagram illustrating an operation example of the high-frequency module according to Embodiment 1.

[0018] Figure 3A is a diagram illustrating a circuit structure of the high-frequency module according to Modified Example 1 of Embodiment 1. Figure 3B is a diagram illustrating a circuit structure of the high-frequency module according to Modified Example 2 of Embodiment 1.

[0019] Figure 4A is a diagram illustrating a circuit structure of the high-frequency module according to Modified Example 3 of Embodiment 1. Figure 4B is a diagram illustrating a circuit structure of the high-frequency module according to Modified Example 4 of Embodiment 1.

[0020] Figure 5 is a diagram illustrating a circuit structure of the high-frequency module and the communication device according to Modified Example 5 of Embodiment 1.

[0021] Figure 6 This is a diagram illustrating the circuit structure of the high-frequency module and communication device involved in Variation 6 of Embodiment 1.

[0022] Figure 7 This is a diagram illustrating the circuit structure of the high-frequency module and communication device involved in Variation 7 of Embodiment 1.

[0023] Figure 8 This is a circuit diagram illustrating the circuit structure of the high-frequency module and communication device involved in Embodiment 2.

[0024] Figure 9A This is a diagram illustrating the circuit structure of the high-frequency module involved in Variation 1 of Embodiment 2. Figure 9B This is a diagram illustrating the circuit structure of the high-frequency module involved in Variation 2 of Embodiment 2.

[0025] Figure 10 This is a diagram illustrating the circuit structure of the high-frequency module involved in Variation 3 of Embodiment 2.

[0026] Figure 11 This is a diagram illustrating the circuit structure of the high-frequency module involved in Variation 4 of Embodiment 2. Detailed Implementation

[0027] The following implementation methods, etc., refer to Figures 1-11 These are all schematic diagrams, and the size and thickness ratios of the constituent elements in the diagrams may not necessarily reflect the actual size ratios.

[0028] (Implementation Method 1)

[0029] The following uses Figures 1-2 The high-frequency module 1 and the communication device 10 equipped with the high-frequency module 1 according to Embodiment 1 will be described.

[0030] (1) High-frequency module

[0031] like Figure 1 As shown, the high-frequency module 1 according to Embodiment 1 has a receiving module 100. The high-frequency module 1 also has a transmitting module (not shown).

[0032] The high-frequency module 1 (receiving module 100) includes a first antenna terminal 2a, a second antenna terminal 2b, a first receiving filter 3, a second receiving filter 4 (receiving filter), a switch 5, a first filter 6, and a second filter 7 (filter). In the high-frequency module 1 (receiving module 100), a first low-noise amplifier 8a and a second low-noise amplifier 8b are included as amplifiers 8 to amplify the signal.

[0033] The high-frequency module 1 is a module capable of handling carrier aggregation and dual connectivity. In the embodiment 1, the high-frequency module 1 handles simultaneous use of a signal of a time division duplex (TDD) system and a signal of a frequency division duplex (FDD) system. Here, the carrier aggregation and the dual connectivity refer to communication that simultaneously uses multiple frequency bands of electric waves. Hereinafter, the communication based on the carrier aggregation or the dual connectivity will also be referred to as simultaneous communication.

[0034] The high-frequency module 1 is used for a portable telephone such as a smartphone, for example. In addition, the high-frequency module 1 can be used for a wearable terminal such as a smartwatch, for example, without being limited to a portable telephone. In any case, as shown in FIG. 1, the high-frequency module 1 is used for a communication device 10 that communicates with an external device (not shown). Figure 1

[0035] (2) Each constituent element of the high-frequency module

[0036] Hereinafter, each constituent element of the high-frequency module 1 related to the embodiment 1 will be described with reference to the drawings.

[0037] As shown in FIG. 2, the first antenna terminal 2a is electrically connected to the antenna 9a. As shown in FIG. 3, the second antenna terminal 2b is electrically connected to the antenna 9b. Figure 1 Figure 1

[0038] As shown in FIG. 4, the third antenna terminal 2c is electrically connected to the antenna 9c. As shown in FIG. 5, the fourth antenna terminal 2d is electrically connected to the antenna 9d. Figure 1 ​​​As shown, the first reception filter 3 is provided in the first reception path R1 for receiving a first reception signal of a first communication band used in FDD-based communication from the antenna 9a through FDD. Here, the first reception path R1 is a path for receiving the first reception signal through FDD via the first antenna terminal 2a. The first reception filter 3 is provided at a stage subsequent to the switch 5 to pass a reception signal of a given band (here, the first reception signal of the first communication band). Specifically, the first reception filter 3 is provided at a stage subsequent to the first switch 5a described later to pass a reception signal of a given band. In the embodiment 1, the first reception filter 3 passes the first reception signal of the first communication band received by the antenna 9a at the time of FDD-based communication. Here, the first communication band is, for example, Band 3 (1710 MHz - 1785 MHz for transmission band, 1805 MHz - 1880 MHz for reception band) of the LTE (Long Term Evolution) standard (including the LTE-Advanced standard). Further, the "stage subsequent to" of the constituent element such as a switch means the side opposite to the antenna terminal (the first antenna terminal 2a, the second antenna terminal 2b) with the constituent element as a reference.

[0039] As shown in FIG. 1, the first reception filter 3 is provided in the first reception path R1 for receiving a first reception signal of a first communication band used in FDD-based communication from the antenna 9a through FDD. Here, the first reception path R1 is a path for receiving the first reception signal through FDD via the first antenna terminal 2a. The first reception filter 3 is provided at a stage subsequent to the switch 5 to pass a reception signal of a given band (here, the first reception signal of the first communication band). Specifically, the first reception filter 3 is provided at a stage subsequent to the first switch 5a described later to pass a reception signal of a given band. In the embodiment 1, the first reception filter 3 passes the first reception signal of the first communication band received by the antenna 9a at the time of FDD-based communication. Here, the first communication band is, for example, Band 3 (1710 MHz - 1785 MHz for transmission band, 1805 MHz - 1880 MHz for reception band) of the LTE (Long Term Evolution) standard (including the LTE-Advanced standard). Further, the "stage subsequent to" of the constituent element such as a switch means the side opposite to the antenna terminal (the first antenna terminal 2a, the second antenna terminal 2b) with the constituent element as a reference. Figure 1 As shown, the second reception filter 4 is provided in the second reception path R2 (reception path) for receiving a second reception signal of a second communication band used in TDD-based communication from the antenna 9b through TDD. Here, the second reception path R2 is a path for receiving the second reception signal through TDD via the second antenna terminal 2b. The second reception filter 4 is provided at a stage subsequent to the switch 5 to pass a reception signal of a given band (here, the second reception signal of the second communication band). Specifically, the second reception filter 4 is provided at a stage subsequent to the second switch 5b described later to pass a reception signal of a given band. In the embodiment 1, the second reception filter 4 passes the second reception signal of the second communication band received by the antenna 9b at the time of TDD-based communication. The second communication band is, for example, n77 (3300 MHz - 4200 MHz for band) decided by the 5G standard. That is, the transmission band (1710 MHz - 1785 MHz) of Band 3 is included in the band of 1 / 2 of the band of n77 (1650 MHz - 2100 MHz). Here, the band of 1 / 2 of the band (the first band) is a range in which a value of 1 / 2 of a lower limit value of the first band is taken as a lower limit value of the second band and a value of 1 / 2 of an upper limit value of the first band is taken as an upper limit value of the second band. That is, the second band includes a frequency of half of the frequency of the reception signal in the first band.

[0040] As shown, the second reception filter 4 is provided in the second reception path R2 (reception path) for receiving a second reception signal of a second communication band used in TDD-based communication from the antenna 9b through TDD. Here, the second reception path R2 is a path for receiving the second reception signal through TDD via the second antenna terminal 2b. The second reception filter 4 is provided at a stage subsequent to the switch 5 to pass a reception signal of a given band (here, the second reception signal of the second communication band). Specifically, the second reception filter 4 is provided at a stage subsequent to the second switch 5b described later to pass a reception signal of a given band. In the embodiment 1, the second reception filter 4 passes the second reception signal of the second communication band received by the antenna 9b at the time of TDD-based communication. The second communication band is, for example, n77 (3300 MHz - 4200 MHz for band) decided by the 5G standard. That is, the transmission band (1710 MHz - 1785 MHz) of Band 3 is included in the band of 1 / 2 of the band of n77 (1650 MHz - 2100 MHz). Here, the band of 1 / 2 of the band (the first band) is a range in which a value of 1 / 2 of a lower limit value of the first band is taken as a lower limit value of the second band and a value of 1 / 2 of an upper limit value of the first band is taken as an upper limit value of the second band. That is, the second band includes a frequency of half of the frequency of the reception signal in the first band. Figure 1As shown, the switch 5 includes a first switch 5a and a second switch 5b.

[0041] The first switch 5a has a common terminal 51 and a selection terminal 52. The selection terminal 52 is electrically connected to the first reception filter 3. The first switch 5a selects the selection terminal 52 as a connection destination of the common terminal 51. The first switch 5a connects the selection terminal 52 and the common terminal 51 at the time of communication of the FDD, for example, by control of the signal processing circuit 80.

[0042] The common terminal 51 is connected to the first antenna terminal 2a. That is, the common terminal 51 is electrically connected to the antenna 9a via the first antenna terminal 2a.

[0043] The second switch 5b switches a transmission path R3 of a transmission signal and a second reception path R2 of a reception signal in communication based on TDD. That is, the second switch 5b is a switch for TDD. The second switch 5b has a common terminal 55 and a plurality of (two in the illustrated example) selection terminals 56, 57. The selection terminal 56 is electrically connected to the second reception filter 4. The selection terminal 57 is electrically connected to a transmission filter (not illustrated) used at the time of communication of TDD. The transmission filter used at the time of communication of TDD passes a transmission signal of a second communication band used at the time of communication based on TDD from the antenna 9b. Further, in the transmission path R3 and the second reception path R2, a path from the second switch 5b to the antenna 9b is common.

[0044] The second switch 5b switches the selection terminal 56 and the selection terminal 57 as a connection destination of the common terminal 55 at the time of communication of TDD. The second switch 5b switches the connection destination of the common terminal 55 at the time of communication of TDD, for example, by control of the signal processing circuit 80, the selection terminal 56 as a connection destination at a time period (reception time period) when a signal is received, and the selection terminal 57 as a connection destination at a time period (transmission time period) when a signal is transmitted. In more detail, the second switch 5b connects the antenna 9b and the second reception filter 4 at the reception time period. Thereby, at the reception time period, it is possible to receive a signal of n77. The second switch 5b sets the antenna 9b and the second reception filter 4 as non-connection at the transmission time period, and connects the transmission filter (not illustrated) used at the time of communication of TDD and the antenna 9b. Thereby, at the transmission time period, it is possible to transmit a signal of n77.

[0045] The common terminal 55 is connected to the second antenna terminal 2b. That is, the common terminal 55 is electrically connected to the antenna 9b via the second antenna terminal 2b.

[0046] In the case of performing simultaneous communication, the antenna 9a and the 1st receiving filter 3 are electrically connected through the 1st switch 5a at all times, and the connection destination of the antenna 9b is switched through the 2nd switch 5b at regular intervals.

[0047] The 1st filter 6 is provided in the 1st receiving path Rl in front of the 1st switch 5a. The 1st filter 6 is, for example, a notch filter. The 1st filter 6 has an inductor 61 and a capacitor 62. One end of the inductor 61 is connected to a point Pl on the 1st receiving path Rl and between the 1st switch 5a and the 1st antenna terminal 2a. The other end of the inductor 61 is connected to one end of the capacitor 62. The other end of the capacitor 62 is connected to the ground. The 1st filter 6 attenuates signals of a frequency belonging to a frequency band of 1 / 2 of a receiving band of Band 3. Here, the "front" of a constituent element such as a switch means the antenna terminal (the 1st antenna terminal 2a, the 2nd antenna terminal 2b) side with the constituent element as a reference.

[0048] The 2nd filter 7 is provided in the 2nd receiving path R2 in front of the 2nd switch 5b. The 2nd filter 7 is, for example, a notch filter. The 2nd filter 7 has an inductor 71 and a capacitor 72. One end of the inductor 71 is connected to a point P2 on the 2nd receiving path R2 and between the 2nd switch 5b and the 2nd antenna terminal 2b. The other end of the inductor 71 is connected to one end of the capacitor 72. The other end of the capacitor 72 is connected to the ground. The 2nd filter 7 attenuates signals of a frequency belonging to a frequency band of 1 / 2 of a frequency band of n77. That is, the 2nd filter 7 attenuates signals of a transmitting band of Band 3.

[0049] The 1st low noise amplifier 8a amplifies a signal (here, a 1st received signal) that has passed through the 1st receiving filter 3. In more detail, the 1st low noise amplifier 8a amplifies a 1st received signal (a signal of Band 3) that has been received by the antenna 9a and has passed through the 1st receiving filter 3. An input terminal of the 1st low noise amplifier 8a is connected to the 1st receiving filter 3. An output terminal of the 1st low noise amplifier 8a is connected to the signal processing circuit 80.

[0050] The 2nd low noise amplifier 8b amplifies a signal (here, a 2nd received signal) that has passed through the 2nd receiving filter 4. In more detail, the 2nd low noise amplifier 8b amplifies a 2nd received signal (a signal of n77) that has been received by the antenna 9b and has passed through the 2nd receiving filter 4. An input terminal of the 2nd low noise amplifier 8b is connected to the 2nd receiving filter 4. An output terminal of the 2nd low noise amplifier 8b is connected to the signal processing circuit 80.

[0051] (3) Communication device

[0052] As Figure 1As shown, the communication device 10 according to Embodiment 1 is provided with the high-frequency module 1, a signal processing circuit 80, and antennas 9a, 9b. The signal processing circuit 80 performs signal processing of signals passing through the high-frequency module 1. The signal processing circuit 80 is provided with a baseband signal processing circuit 81 and an RF signal processing circuit 82.

[0053] As shown, the baseband signal processing circuit 81 is, for example, a BBIC (Baseband Integrated Circuit), and is electrically connected to the RF signal processing circuit 82. The baseband signal processing circuit 81 generates an I-phase signal and a Q-phase signal from a baseband signal. The baseband signal processing circuit 81 performs IQ modulation processing by synthesizing the I-phase signal and the Q-phase signal, and outputs a transmission signal. At this time, the transmission signal is generated as a modulated signal in which a carrier signal of a given frequency is amplitude-modulated at a period longer than the period of the carrier signal. Figure 1

[0054] As shown, the RF signal processing circuit 82 is, for example, an RFIC (Radio Frequency Integrated Circuit), and is provided between the high-frequency module 1 and the baseband signal processing circuit 81. The RF signal processing circuit 82 has a function of performing signal processing on a transmission signal from the baseband signal processing circuit 81 and a function of performing signal processing on a reception signal received by the antenna 9. The RF signal processing circuit 82 is a processing circuit that deals with multiple frequency bands, and is capable of generating transmission signals of multiple communication frequency bands and amplifying them. Figure 1

[0055] In addition, in the communication device 10, the baseband signal processing circuit 81 is not an essential constituent element.

[0056] (4) Action example of high-frequency module

[0057] Hereinafter, the action of the high-frequency module 1 in the case of performing simultaneous communication will be described. Figure 1

[0058] In this case, the first switch 5a connects the antenna 9a and the first reception filter 3. The second switch 5b selects either one of the selection terminals 56 and 57 as the connection destination of the common terminal 55. The antenna 9a is always connected to the first reception filter 3, and the antenna 9b is alternately connected to the second reception filter 4 and a transmission filter (not shown) used in TDD.

[0059] The first reception signal of FDD received by the antenna 9a is output to the RF signal processing circuit 82 via the first reception filter 3 in the first reception path R1.

[0060] ​​​The FDD transmission signal is output to an antenna (not shown) that transmits the FDD signal via a path not shown. The antenna that transmits the FDD signal outputs the FDD transmission signal if the FDD transmission signal is received.

[0061] The second-received TDD signal received by the antenna 9b is input to the RF signal processing circuit 82 via the second-received filter 4 in the second-received path R2.

[0062] The TDD transmission signal is output to the antenna 9b via the transmission path R3 and the second antenna terminal 2b. The antenna 9b outputs the TDD transmission signal if the TDD transmission signal is received.

[0063] In Embodiment 1, the FDD transmission signal is a signal of a frequency included in the transmission band of Band 3. Further, the antenna 9b sometimes receives a signal of Band 3 transmitted from an antenna (not shown) that transmits the FDD signal. That is, the antenna 9b sometimes receives the second-received signal Sig1 that is a signal of n77 and the FDD signal Sig2 (refer to FIG. 1). Figure 2 ).

[0064] In Embodiment 1, the second filter 7 attenuates a signal of a frequency of a frequency band that is 1 / 2 of the frequency band belonging to n77. Therefore, the signal Sig2 received by the antenna 9b is attenuated by the second filter 7. As a result, in the second-received path R2 after the stage subsequent to the second-received filter 4, only the second-received signal Sig1 can pass as shown in FIG. 2. Figure 2

[0065] (5) Effects

[0066] As described above, the high-frequency module 1 of Embodiment 1 is provided with a switch (for example, the second switch 5b), a reception filter (for example, the second-received filter 4), a low-noise amplifier (for example, the second low-noise amplifier 8b), and a filter (for example, the second filter 7). The switch switches a transmission path of a transmission signal and a reception path of a reception signal (here, the second-received signal) in communication based on a time division multiplexing system. The reception filter is provided at a stage subsequent to the switch to pass a reception signal of a given frequency band (for example, n77). The low-noise amplifier amplifies the reception signal that has passed the reception filter. The filter is provided at a stage prior to the switch in the reception path (for example, the second-received path R2).

[0067] According to this structure, a signal of an unnecessary frequency band is attenuated by the filter, and therefore a harmonic of the signal of the unnecessary frequency band caused by a nonlinear characteristic of the switch is not generated. Therefore, it is possible to further suppress a decrease in reception sensitivity.

[0068] ​Further, the filter attenuates a signal of a second frequency band lower than the first frequency band as a given frequency band. Specifically, the second frequency band contains a frequency that is half of a frequency of the received signal of the first frequency band. Thereby, a 2nd harmonic of the signal of the unnecessary frequency band caused by the non-linear characteristic of the switch is not generated. Therefore, by providing the filter, it is possible to prevent the generation of the 2nd harmonic of the signal of the unnecessary frequency band. Thus, it is possible to further suppress the decrease in the reception sensitivity.

[0069] (6) Modification

[0070] Hereinafter, a modification of Embodiment 1 will be described.

[0071] (6.1) Modification 1

[0072] The high frequency module 1 (the reception module 100) can also be provided with Figure 3A the first filter 6A, the second filter 7A, the first switch 63, and the second switch 73 shown in FIG. 6A instead of the first filter 6 and the second filter 7.

[0073] Like the first filter 6, the first filter 6A is provided in the first reception path Rl in front of the first switch 5a. The first filter 6A is, for example, a notch filter. Like the first filter 6 of Embodiment 1, the first filter 6A has an inductor 61 and a capacitor 62.

[0074] One end of the first switch 63 is connected to a point Pl on the first reception path Rl and between the first switch 5a and the first antenna terminal 2a. The other end of the first switch 63 is connected to one end of the inductor 61. The other end of the inductor 61 is connected to one end of the capacitor 62. The other end of the capacitor 62 is connected to the ground. The first filter 6A attenuates a signal of a frequency belonging to a frequency band that is 1 / 2 of a reception band of Band 3.

[0075] The first switch 63 electrically connects between the first reception path Rl and the inductor 61 at the time of communication of FDD. In the case where communication of FDD is not performed, the first switch 63 does not connect between the first reception path Rl and the inductor 61. That is, the first switch 63 switches connection and non-connection of the first filter 6A to the first reception path Rl. In other words, the first switch 63 switches connection and non-connection between the first filter 6A and the first reception path Rl.

[0076] Like the second filter 7, the second filter 7A is provided in the second reception path R2 in front of the second switch 5b. The second filter 7A is, for example, a notch filter. Like the second filter 7 of Embodiment 1, the second filter 7A has an inductor 71 and a capacitor 72.

[0077] One end of the second switch 73 is connected to a point P2 on the second reception path R2 and between the second switch 5b and the second antenna terminal 2b. The other end of the second switch 73 is connected to one end of the inductor 71. The other end of the inductor 71 is connected to one end of the capacitor 72. The other end of the capacitor 72 is connected to the ground. The second filter 7A attenuates a signal of a frequency of a frequency band belonging to 1 / 2 of the frequency band of n77.

[0078] The second switch 73 electrically connects between the second reception path R2 and the inductor 71 at the time of communication of TDD. In the case where communication of TDD is not performed, the second switch 73 does not connect between the second reception path R2 and the inductor 71. That is, the second switch 73 switches connection and non-connection between the second filter 7A and the second reception path R2.

[0079] (6.2) Modification 2

[0080] The high-frequency module 1 (of the reception module 100) can also be provided with the first filter 6B and the second filter 7B instead of the first filter 6 and the second filter 7. Figure 3B The first filter 6B and the second filter 7B are shown.

[0081] Like the first filter 6, the first filter 6B is provided in the first reception path R1 in front of the first switch 5a. The first filter 6B is, for example, a notch filter. The first filter 6B has an inductor 61 and a capacitor 62B. One end of the inductor 61 is connected to a point P1 on the first reception path R1 and between the first switch 5a and the first antenna terminal 2a. The other end of the inductor 61 is connected to one end of the capacitor 62B. The other end of the capacitor 62B is connected to the ground. The capacitor 62B is a variable capacitor configured to be able to change the value of the capacitor 62B. That is, the first filter 6B is configured so that the frequency band of the frequency of the signal to be attenuated is variable. The first filter 6B is able to change the frequency band of the signal to be attenuated by changing the value of the capacitor 62B. In this modification, the value of the capacitor 62B is set so that a signal of a frequency of a frequency band belonging to 1 / 2 of the reception band of Band 3 is attenuated.

[0082] Similar to the second filter 7, the second filter 7B is positioned before the second switch 5b in the second receiving path R2. The second filter 7B is, for example, a notch filter. The second filter 7B has an inductor 71 and a capacitor 72B. One end of the inductor 71 is connected to point P2 on the second receiving path R2, between the second switch 5b and the second antenna terminal 2b. The other end of the inductor 71 is connected to one end of the capacitor 72B. The other end of the capacitor 72B is connected to ground. The capacitor 72B is a variable capacitor, configured to change its value. That is, the second filter 7D is configured such that the frequency band of the attenuated signal is variable. The second filter 7B can change the frequency band of the signal to be attenuated by changing the value of the capacitor 72B. In this modified example, the value of the capacitor 72B is set such that a signal with a frequency belonging to half of the frequency band of n77 is attenuated.

[0083] With this structure, the frequency band of the signal attenuated by the second filter 7B can be changed according to the frequency band (transmission band) of the FDD communication which is simultaneously communicating with the TDD communication using n77 as the frequency band.

[0084] Furthermore, although capacitors 62B and 72B are configured as variable capacitors in this modified example, this is not a limitation. Inductors 61 and 71 may also be configured as variable inductors. Alternatively, both the capacitors and inductors may be variable.

[0085] (6.3) Variation Example 3

[0086] like Figure 4A As shown, the high-frequency module 1 (receiving module 100) can also replace the first filter 6 and the second filter 7 by having multiple (two each in the illustrated example) groups of first filters 6C and first switching switches 63, and groups of second filters 7C and second switching switches 73. Furthermore, when it is necessary to distinguish between the multiple first filters 6C, they are referred to as first filters 601 and 602. Similarly, when it is necessary to distinguish between the multiple second filters 7C, they are referred to as second filters 701 and 702.

[0087] Similar to the first filter 6, a plurality of first filters 6C are disposed in the first receiving path R1 before the first switch 5a. The plurality of first filters 6C are, for example, notch filters. The plurality of first filters 6C have the same constituent elements as the first filter 6 of Embodiment 1 and the first filter 6A of Modification 1. That is, the plurality of first filters 6C have an inductor 61 and a capacitor 62. The first switching switch 63 is a switch that switches between connection and disconnection between the first filters 6C and the first receiving path R1.

[0088] One end of the first switch 63 is connected to a path between the first switch 5a and the first antenna terminal 2a on the first reception path Rl. The other end of the first switch 63 is connected to one end of the inductor 61. The other end of the inductor 61 is connected to one end of the capacitor 62. The other end of the capacitor 62 is connected to the ground. In the present modification example, one end of the first switch 63 connected to the first filter 601 is connected to a point Pl on the first reception path Rl and between the first switch 5a and the first antenna terminal 2a. One end of the first switch 63 connected to the first filter 602 is connected to a point Pl l on the first reception path Rl and between the first switch 5a and the first antenna terminal 2a.

[0089] The frequency bands of the signals attenuated by the plurality of first filters 6C are different. In other words, the plurality of first filters 6C attenuate signals of different frequency bands from each other. In the present modification example, the first filter 601 of the plurality of first filters 6C attenuates signals of a frequency belonging to a frequency band of 1 / 2 of a reception band of Band 3.

[0090] The plurality of second filters 7C is provided in the second reception path R2 in front of the second switch 5b, like the second filter 7. The plurality of second filters 7C is, for example, a notch filter. The plurality of second filters 7C has the same constituent elements as the second filter 7 of Embodiment 1 and the second filter 7A of Modification Example 1. That is, the plurality of second filters 7C has the inductor 71 and the capacitor 72. The second switch 73 is a switch that switches connection and non-connection between the second filter 7C and the second reception path R2.

[0091] One end of the second switch 73 is connected to a path between the second switch 5b and the second antenna terminal 2b on the second reception path R2. The other end of the second switch 73 is connected to one end of the inductor 71. The other end of the inductor 71 is connected to one end of the capacitor 72. The other end of the capacitor 72 is connected to the ground. In the present modification example, one end of the second switch 73 connected to the second filter 701 is connected to a point P2 on the second reception path R2 and between the second switch 5b and the second antenna terminal 2b. One end of the second switch 73 connected to the second filter 702 is connected to a point P21 on the second reception path R2 and between the second switch 5b and the second antenna terminal 2b.

[0092] The signal frequency bands attenuated by the plurality of second filters 7C are different. In other words, the plurality of second filters 7C attenuate signals of different frequency bands from each other. In the present modification example, the second filter 701 among the plurality of second filters 7C attenuates signals of a frequency belonging to a frequency band of 1 / 2 of a reception band of Band 3. The second filter 702 attenuates signals of a frequency belonging to a transmission band of FDD used in simultaneous communication with n77.

[0093] (6.4) Modification Example 4

[0094] The high-frequency module 1 (of the reception module 100) can also be provided with Figure 4B the first filter 6D, the second filter 7D, the first switch 63, and the second switch 73 shown in FIG. 6D instead of the first filter 6 and the second filter 7.

[0095] Like the first filter 6, the first filter 6D is provided in the first reception path R1 in front of the first switch 5a. The first filter 6D is, for example, a notch filter. The first filter 6D has an inductor 61 and a capacitor 62D. The first switch 63 is a switch that switches connection and non-connection between the first filter 6D and the first reception path R1. One end of the first switch 63 is connected to a point P1 on the first reception path R1 and between the first switch 5a and the first antenna terminal 2a. The other end of the first switch 63 is connected to one end of the inductor 61. The other end of the inductor 61 is connected to one end of the capacitor 62D. The other end of the capacitor 62D is connected to ground. The capacitor 62D is a variable capacitor configured to be able to change the value of the capacitor 62D. That is, the first filter 6D is configured so that the frequency band of the frequency of the signal attenuated is variable. The first filter 6D is able to change the frequency band of the signal of which attenuation is targeted by changing the value of the capacitor 62D. In the present modification example, the value of the capacitor 62D is set so that signals of a frequency belonging to a frequency band of 1 / 2 of a reception band of Band 3 are attenuated.

[0096] As with the 2nd filter 7, the 2nd filter 7D is provided in the 2nd reception path R2 in front of the 2nd switch 5b. The 2nd filter 7D is, for example, a notch filter. The 2nd filter 7D has an inductor 71 and a capacitor 72D. A 2nd switching switch 73 is a switch that switches connection and non-connection between the 2nd filter 7D and the 2nd reception path R2. One end of the 2nd switching switch 73 is connected to a point P2 on the 2nd reception path R2 and between the 2nd switch 5b and the 2nd antenna terminal 2b. The other end of the 2nd switching switch 73 is connected to one end of the inductor 71. The other end of the inductor 71 is connected to one end of the capacitor 72D. The other end of the capacitor 72D is connected to ground. The capacitor 72D is a variable capacitor configured to be able to change the value of the capacitor 72D. That is, the 2nd filter 7D is configured so that the frequency band of the frequency of the signal to be attenuated is variable. The 2nd filter 7D is able to change the frequency band of the signal to be attenuated by changing the value of the capacitor 72D. In the present modification example, the value of the capacitor 72D is set so that the signal of the frequency of the frequency band that is 1 / 2 of the frequency band belonging to n77 is attenuated.

[0097] In addition, although the capacitor 62D and the capacitor 72D are provided as variable capacitors in the present modification example, the present application is not limited thereto. The inductor 61 and the inductor 71 can also be provided as variable inductors. Alternatively, both the capacitor and the inductor can be made variable.

[0098] Furthermore, the 1st filter 6D and the 2nd filter 7D of the present modification example can also be applied to Modification Example 3. That is, for the reception module 100 of the high-frequency module 1 of Modification Example 3, the 1st filter 6D can be applied instead of the 1st filter 6C of Modification Example 3, and the 2nd filter 7D can be applied instead of the 2nd filter 7C of Modification Example 3, respectively.

[0099] (6.5) Modification Example 5

[0100] Although the high-frequency module 1 is provided as a structure including the reception module 100 in the above-described Embodiment 1, the present application is not limited to this structure. The high-frequency module 1 can also include a transceiver module 100E instead of the reception module 100 (refer to FIG. 19). Figure 5 ) instead of the reception module 100.

[0101] The high-frequency module 1 (transceiver module 100E) of this modification includes a first antenna terminal 2a, a second antenna terminal 2b, a first receiving filter 3, a second receiving filter 4, a first transmitting filter 3E, a second transmitting filter 4E, a switch 5, a first filter 6, and a second filter 7. In the high-frequency module 1 (transceiver module 100E), an amplifier 8 for signal amplification includes a first low-noise amplifier 8a, a second low-noise amplifier 8b, a first power amplifier 8d, and a second power amplifier 8c. Furthermore, the communication device 10 of this modification includes the high-frequency module 1 containing the transceiver module 100E of this modification, a signal processing circuit 80, and antennas 9a and 9b.

[0102] The first antenna terminal 2a, the second antenna terminal 2b, the first receiving filter 3, the second receiving filter 4, the switch 5, the first filter 6, the second filter 7, the first low-noise amplifier 8a, and the second low-noise amplifier 8b have already been described in Embodiment 1, and therefore, their descriptions are omitted here. Furthermore, the signal processing circuit 80 has also been described in Embodiment 1, and therefore, its description is omitted here.

[0103] like Figure 5 As shown, the first transmit filter 3E is disposed in the transmit path R4, which is used to transmit the transmit signal of the first communication frequency band used in FDD-based communication from the antenna 9a via FDD. Here, the transmit path R4 is the path for transmitting the transmit signal via the first antenna terminal 2a via FDD. The first transmit filter 3E is disposed after the switch 5 to allow the transmit signal of the given frequency band (here, the transmit signal of the first communication frequency band) to pass through. Specifically, the first transmit filter 3E is disposed after the first switch 5a to allow the transmit signal of the given frequency band to pass through. The first transmit filter 3E allows the transmit signal received from the baseband signal processing circuit 81 of the signal processing circuit 80 to pass through during FDD-based communication. Here, similar to Embodiment 1, the first communication frequency band is, for example, Band 3 of the LTE standard (including the LTE-Advanced standard) (transmit band of 1710MHz-1785MHz, receive band of 1805MHz-1880MHz).

[0104] like Figure 5As shown, the second transmission filter 4E is provided in the transmission path R3 for transmitting a transmission signal of the second communication band used in TDD-based communication from the antenna 9b through TDD. Here, the transmission path R3 is a path for transmitting a transmission signal through TDD via the second antenna terminal 2b. The second transmission filter 4E is provided at a stage subsequent to the switch 5 to pass a transmission signal of a given band (here, a transmission signal of the second communication band). Specifically, the second transmission filter 4E is provided at a stage subsequent to the second switch 5b to pass a transmission signal of a given band. The second transmission filter 4E passes a transmission signal received from the baseband signal processing circuit 81 of the signal processing circuit 80 at the time of TDD-based communication. Here, as with Embodiment 1, the second communication band is, for example, n77 (band of 3300 to 4200 MHz) decided by the 5G standard.

[0105] The first power amplifier 8d amplifies a transmission signal (transmission signal of Band 3) received from the baseband signal processing circuit 81. The input terminal of the first power amplifier 8d is connected to the signal processing circuit 80 (the baseband signal processing circuit 81). The output terminal of the first power amplifier 8d is connected to the first transmission filter 3E.

[0106] The second power amplifier 8c amplifies a transmission signal (transmission signal of n77) received from the baseband signal processing circuit 81. The input terminal of the second power amplifier 8c is connected to the signal processing circuit 80 (the baseband signal processing circuit 81). The output terminal of the second power amplifier 8c is connected to the second transmission filter 4E.

[0107] The transmission signal of FDD is a signal containing frequencies of the transmission band of Band 3. Further, in Modified Example 5, the antenna 9b sometimes also receives a signal of Band 3 transmitted from the antenna 9a that transmits a signal of FDD. However, by providing the second filter 7, as with Embodiment 1, it is possible to further suppress a decrease in reception sensitivity.

[0108] In addition, in the high-frequency module 1 (the transceiving module 100E) of the present modified example, the first filter and the second filter of Modified Examples 1 to 4 described above can be applied instead of the first filter 6 and the second filter 7 of the present modified example.

[0109] (6.6) Modified Example 6

[0110] In Modified Example 5 described above, the second reception filter 4 and the second transmission filter 4E are configured as independent filters, but are not limited to this configuration. The second reception filter 4 and the second transmission filter 4E can also be configured by one filter.

[0111] The high-frequency module 1 of the present modification includes a transceiving module 100F. As shown in Figure 6 The transceiving module 100F has the antenna terminal 2, the reception filter 3F, the transceiving filter 4F, the antenna switch 500 (switch), the switching switch 510, and the filter 7F. In the high-frequency module 1 (of the transceiving module 100F), as the amplifier 8 that amplifies a signal, the first low-noise amplifier 8a, the second low-noise amplifier 8b, and the second power amplifier 8c (hereinafter, referred to as "power amplifier 8c" in Modification 6) are provided. Further, the communication device 10 of the present modification has the high-frequency module 1 of the present modification that includes the transceiving module 100F, the signal processing circuit 80, and the antenna 9.

[0112] As shown in Figure 6 The antenna terminal 2 is electrically connected to the antenna 9.

[0113] As shown in Figure 1 The reception filter 3F is provided in the third reception path R11 for receiving a third reception signal of a third communication band used in FDD-based communication from the antenna 9 by FDD. Here, the third reception path R11 is a path for receiving the third reception signal via the antenna terminal 2 by FDD. The reception filter 3F is provided in the rear stage of the antenna switch 500, and passes a reception signal of a given band (here, the third reception signal of the third communication band). In the present modification, the reception filter 3F passes the third reception signal of the third communication band received by the antenna 9 at the time of FDD-based communication. Here, the third reception signal of the third communication band is, for example, a signal of a band of the LTE (Long Term Evolution) standard (including the LTE-Advanced standard), and is a signal of a band that does not overlap with 1 / 2 of the band of the second communication band.

[0114] As shown in Figure 6As shown, the transceiver filter 4F is disposed in path R21, which is used to receive the second received signal of the second communication band used in TDD-based communication from antenna 9 via TDD, and to transmit the second communication band transmitted signal from antenna 9 via TDD. Here, path R21 is a path that receives the second received signal via antenna terminal 2 via TDD, and transmits the transmitted signal from antenna terminal 2 via TDD. The transceiver filter 4F is disposed after antenna switch 500, allowing the received signal of a given frequency band (here, the second received signal of the second communication band) and the transmitted signal of a given frequency band (the transmitted signal of the second communication band) to pass through. In this modified example, the transceiver filter 4F allows the second received signal of the second communication band received by antenna 9 to pass through during the receiving period of TDD-based communication. The transceiver filter 4F allows the transmitted signal of the second communication band output from signal processing circuit 80 to pass through during the transmitting period of TDD-based communication. Similar to implementation method 1, the second communication frequency band is, for example, n77 (band 3300MHz-4200MHz) determined by the 5G standard.

[0115] Antenna switch 500 is a switch that toggles the connection destination between antenna terminal 2 (that is, antenna 9). For example... Figure 6 As shown, the antenna switch 500 has a common terminal 501 and multiple (two in the illustrated example) select terminals 502 and 503. The antenna switch 500 selects at least one of the multiple select terminals 502 and 503 as the connection destination of the common terminal 501. That is, the antenna switch 500 selectively connects the receive filter 3F, the transmit / receive filter 4F, and the antenna 9. The common terminal 501 is connected to the antenna terminal 2. That is, the common terminal 501 is electrically connected to the antenna 9 via the antenna terminal 2. In addition, the common terminal 501 is not limited to being directly connected to the antenna 9. A filter or coupler may also be provided between the common terminal 501 and the antenna 9. The select terminal 502 is electrically connected to the receive filter 3F. The select terminal 503 is electrically connected to the transmit / receive filter 4F. That is, the antenna switch 500 can be connected to the antenna terminal 2, the receive filter 3F, and the transmit / receive filter 4F simultaneously.

[0116] The switch 510 switches the transmission path of the transmission signal and the reception path of the reception signal (the 2nd reception signal) in the TDD-based communication. That is, the switch 510 is a switch for TDD. The switch 510 has a common terminal 511 and a plurality of (two in the illustrated example) selection terminals 512, 513. The common terminal 511 is electrically connected to the transceiving filter 4F. The selection terminal 512 is electrically connected to the 2nd low-noise amplifier 8b. The selection terminal 513 is electrically connected to the power amplifier 8c. The switch 510 switches the selection terminal 512 and the selection terminal 513 as the connection destination of the common terminal 511 at the time of the communication of TDD. The switch 510 switches the connection destination of the common terminal 511 at the time of the communication of TDD, for example, by the control of the signal processing circuit 80, and switches the selection terminal 512 as the connection destination at the reception time period and the selection terminal 513 as the connection destination at the transmission time period. In more detail, the switch 510 connects the transceiving filter 4F and the 2nd low-noise amplifier 8b at the reception time period. Thereby, at the reception time period, it is possible to receive the signal of n77. The switch 510 connects the transceiving filter 4F and the power amplifier 8c at the transmission time period. Thereby, at the transmission time period, it is possible to transmit the signal of n77.

[0117] The filter 7F is provided at a stage prior to the antenna switch 500 in the path R21. The filter 7F is, for example, a notch filter. The filter 7F has an inductor 71 and a capacitor 72. One end of the inductor 71 is connected to a point P22 on the path R21 and between the antenna switch 500 and the antenna terminal 2. The other end of the inductor 71 is connected to one end of the capacitor 72. The other end of the capacitor 72 is connected to the ground. The filter 7F attenuates the signal of the frequency of the frequency band belonging to 1 / 2 of the frequency band of n77. That is, the filter 7F attenuates the signal of the transmission band of Band 3.

[0118] The 1st low-noise amplifier 8a is different from the 1st low-noise amplifier 8a of Embodiment 1 only in the reception band of the signal to be processed, and has the same function, and thus the description is omitted here.

[0119] The 2nd low-noise amplifier 8b is the same as the 2nd low-noise amplifier 8b of Embodiment 1, and thus the description is omitted here.

[0120] The power amplifier 8c amplifies the signal (transmission signal) received from the signal processing circuit 80. The power amplifier 8c outputs the amplified transmission signal to the transceiving filter 4F via the switch 510. The input terminal of the power amplifier 8c is connected to the signal processing circuit 80. The output terminal of the power amplifier 8c is connected to the transceiving filter 4F via the switch 510.

[0121] Also, the configuration of the signal processing circuit 80 is the same as that of Embodiment 1, and thus the description thereof is omitted here.

[0122] In the present modification, the transmission and reception of signals in Band 3 are performed by a different module from the transceiving module 100F. That is, the communication device 10 of the present modification is capable of simultaneous communication using Band 3 and n77. Thus, when the simultaneous communication using Band 3 and n77 is performed, the antenna 9 can receive the transmission signal of Band 3.

[0123] Thus, the high-frequency module 1 of the present modification is provided with a switch (e.g., the antenna switch 500), a transceiving filter (4F), a low-noise amplifier (e.g., the second low-noise amplifier 8b), and a filter (e.g., the filter 7F). The switch switches the connection destination with the antenna (9). The transceiving filter (4F) is provided at the post-stage of the switch, and passes the reception signal of a given frequency band (here, the second reception signal) and the transmission signal of the given frequency band. The low-noise amplifier amplifies the reception signal that has passed the transceiving filter (4F). The filter is provided at the pre-stage of the switch in the reception path (e.g., the path R21) of the reception signal.

[0124] With the above configuration, it is possible to reduce the possibility that the 2nd harmonic of the transmission signal of Band 3 is input to the transceiving filter 4F. Thus, it is possible to further suppress the decrease in reception sensitivity.

[0125] Also, in the high-frequency module 1 (of the transceiving module 100F) of the present modification, the second filter of Embodiments 1 to 4 described above can be applied instead of the filter 7F of the present modification.

[0126] (6.7) Modification 7

[0127] Although in the above-described Embodiment 1, the configuration is such that different antennas are used for the communication in the first communication band (Band 3) and the communication in the second communication band (n77), the configuration is not limited to this.

[0128] It is also possible to use the same antenna for the communication in the first communication band (Band 3) and the communication in the second communication band (n77). For example, Figure 7As shown, in this modified example, the high-frequency module 1 includes a receiver module 100G. The receiver module 100G includes an antenna terminal 2, a first receiving filter 3, a second receiving filter 4, an antenna switch 550, a path switching switch 560, and a filter 7G. In the high-frequency module 1 (the receiver module 100G), an amplifier 8 for amplifying the signal includes a first low-noise amplifier 8a and a second low-noise amplifier 8b. Furthermore, the communication device 10 of this modified example includes the high-frequency module 1 with the receiver module 100G, a signal processing circuit 80, and an antenna 9.

[0129] The first receiving filter 3, the second receiving filter 4, the first low-noise amplifier 8a, the second low-noise amplifier 8b, and the signal processing circuit 80 have been described in Embodiment 1, and therefore, the description is omitted here.

[0130] like Figure 7 As shown, antenna terminal 2 is electrically connected to antenna 9.

[0131] Antenna switch 550 is a switch that toggles the connection destination to antenna terminal 2 (antenna 9). For example... Figure 7 As shown, the antenna switch 550 has a common terminal 551 and multiple (two in the illustrated example) selectable terminals 552 and 553. The antenna switch 550 selects at least one of the multiple selectable terminals 552 and 553 as the connection destination for the common terminal 551. That is, the antenna switch 550 selectively connects the first receiving filter 3 and the second receiving filter 4 to the antenna 9. The common terminal 551 is connected to the antenna terminal 2. In other words, the common terminal 551 is electrically connected to the antenna 9 via the antenna terminal 2. Furthermore, the common terminal 551 is not limited to direct connection to the antenna 9. A filter or coupler may also be provided between the common terminal 551 and the antenna 9. The selectable terminal 552 is electrically connected to the first receiving filter 3. The selectable terminal 553 is electrically connected to the second receiving filter 4. That is, the antenna switch 550 can be connected simultaneously to the antenna terminal 2, the first receiving filter 3, and the second receiving filter 4.

[0132] The path switching switch 560 switches the transmission path R32 of the transmission signal and the reception path R22 of the reception signal (the above-mentioned second reception signal) in the TDD-based communication. That is, the path switching switch 560 is a switch for TDD. The path switching switch 560 has a common terminal 561 and a plurality of (two in the illustrated example) selection terminals 562, 563. The common terminal 561 is electrically connected to the selection terminal 553 of the antenna switch 550. The selection terminal 562 is electrically connected to the second reception filter 4. The selection terminal 563 is electrically connected to a transmission filter (not illustrated) used at the time of the communication of TDD. In addition, in the transmission path R32 and the reception path R22, the paths from the path switching switch 560 to the antenna 9 are common. The path switching switch 560 switches the connection destination of the common terminal 561 to the selection terminal 562 and the selection terminal 563 at the time of the communication of TDD. The path switching switch 560 switches the connection destination of the common terminal 561 to the selection terminal 562 at the reception time period and to the selection terminal 563 at the transmission time period, for example, by the control of the signal processing circuit 80. In more detail, the switching switch 510 connects the second reception filter 4 and the selection terminal 553 of the antenna switch 550 at the reception time period. Thereby, at the reception time period, it is possible to receive the signal of n77. The path switching switch 560 connects the transmission filter (not illustrated) used at the time of the communication of TDD and the selection terminal 553 of the antenna switch 550 at the transmission time period. Thereby, at the transmission time period, it is possible to transmit the signal of n77.

[0133] The filter 7G is provided at a stage prior to the path switching switch 560 in the reception path R22. The filter 7G is, for example, a notch filter. The filter 7G has an inductor 71 and a capacitor 72. One end of the inductor 71 is connected to a point P23 on the reception path R22 and between the antenna switch 500 and the path switching switch 560. The other end of the inductor 71 is connected to one end of the capacitor 72. The other end of the capacitor 72 is connected to the ground. The filter 7G attenuates the signal of the frequency of the frequency band belonging to 1 / 2 of the frequency band of n77. That is, the filter 7G attenuates the signal of the transmission band of Band 3.

[0134] In addition, in the high-frequency module 1 (of the transceiving module 100G) of the present modified example, the second filter of the above-mentioned modified examples 1 to 4 can be applied instead of the filter 7G of the present modified example.

[0135] (6.8) Modified Example 8

[0136] Although in the above embodiment 1, the first filter 6 is configured to attenuate signals with frequencies belonging to half of the receiving band of the first communication band (Band 3), it is not limited to this configuration. The first filter 6 may also be configured to attenuate signals with frequencies belonging to a band lower than the receiving band of the first communication band (Band 3).

[0137] Similarly, the second filter 7 can also be a structure that attenuates signals that belong to a frequency band lower than the frequency band of the second communication band (n77).

[0138] Furthermore, similarly, in the first filters described in Variations 1 to 5, these first filters can also be structures that attenuate signals belonging to a frequency band lower than the receiving band of the first communication band (Band 3). Similarly, in the second filters described in Variations 1 to 5, these second filters can also be structures that attenuate signals belonging to a frequency band lower than the frequency band of the second communication band (n77).

[0139] Furthermore, in the filters described in variations 6 and 7, these filters can also be structures that attenuate signals belonging to frequencies lower than the frequency band of the second communication band (n77).

[0140] (Implementation Method 2)

[0141] In Embodiment 2, the structures of the first filter and the second filter differ from those in Embodiment 1. The following description focuses on the differences from Embodiment 1. Furthermore, the same reference numerals are used for components identical to those in Embodiment 1, and their descriptions are omitted where appropriate.

[0142] (1) Structure

[0143] like Figure 8 As shown, the communication device 10H of Embodiment 2 includes a signal processing circuit 80, a high-frequency module 1H, and antennas 9a and 9b. The high-frequency module 1H includes a receiving module 100H. The high-frequency module 1H also includes a transmitting module (not shown).

[0144] The high-frequency module 1H (receiving module 100H) includes a first antenna terminal 2a, a second antenna terminal 2b, a first receiving filter 3, a second receiving filter 4 (receiving filters), a switch 5, a first filter 6H, and a second filter 7H (filter). In the high-frequency module 1H (receiving module 100H), the amplifier 8, which amplifies the signal, includes a first low-noise amplifier 8a and a second low-noise amplifier 8b. Similar to Embodiment 1, the switch 5 includes a first switch 5a and a second switch 5b.

[0145] The first filter 6H is provided in the first receiving path Rl in front of the first switch 5a. The first filter 6H is, for example, a high-pass filter. The first filter 6H has a first capacitor 65, a second capacitor 66, and an inductor 67. The first capacitor 65 and the second capacitor 66 are connected in series on the first receiving path Rl and between the first antenna terminal 2a and the first switch 5a. One end of the inductor 67 is connected between the first capacitor 65 and the second capacitor 66. The other end of the inductor 67 is connected to the ground. The first filter 6H attenuates signals of a frequency belonging to a frequency band of 1 / 2 of a receiving band of Band 3.

[0146] The second filter 7H is provided in the second receiving path R2 in front of the second switch 5b. The second filter 7H is, for example, a high-pass filter. The second filter 7H has a first capacitor 75, a second capacitor 76, and an inductor 77. The first capacitor 75 and the second capacitor 76 are connected in series on the second receiving path R2 and between the second antenna terminal 2b and the second switch 5b. One end of the inductor 77 is connected between the first capacitor 75 and the second capacitor 76. The other end of the inductor 77 is connected to the ground. The second filter 7H attenuates signals of a frequency belonging to a frequency band of 1 / 2 of a frequency band of n77. That is, the second filter 7H attenuates signals of a transmission band of Band 3.

[0147] The high-frequency module 1H of Embodiment 2 has a switch (for example, the second switch 5b), a reception filter (the second reception filter 4), a low-noise amplifier (for example, the second low-noise amplifier 8b), and a filter (for example, the second filter 7H). The switch switches a transmission path of a transmission signal and a reception path of a reception signal (here, the second reception signal) in communication based on a time division multiplexing system. The reception filter is provided in back of the switch and passes a reception signal of a given frequency band. The low-noise amplifier amplifies the reception signal that has passed the reception filter. The filter is provided in front of the switch in a reception path (for example, the second receiving path R2).

[0148] According to this structure, signals of an unnecessary frequency band are attenuated by the filter, and thus harmonics of the signals of the unnecessary frequency band caused by a nonlinear characteristic of the switch are not generated. Therefore, it is possible to further suppress a decrease in reception sensitivity.

[0149] (2) Modification

[0150] Hereinafter, a modification of Embodiment 2 will be described.

[0151] (2.1) Modification 1

[0152] The high-frequency module 1H (the reception module 100H) can have, instead of the first filter 6H and the second filter 7H,Figure 9A The first filter 61, the second filter 71, the first switch 680, and the second switch 780 are shown.

[0153] Like the first filter 6H, the first filter 61 is provided in the first reception path R1 in front of the first switch 5a. The first filter 61 is, for example, a high-pass filter. Like the first filter 6H of Embodiment 2, the first filter 61 has a first capacitor 65, a second capacitor 66, and an inductor 67. The first capacitor 65 and the second capacitor 66 are connected in series on the first reception path R1 and between the first antenna terminal 2a and the first switch 5a. One end of the inductor 67 is connected between the first capacitor 65 and the second capacitor 66. The other end of the inductor 67 is connected to the ground. The first filter 61 attenuates signals of a frequency band belonging to 1 / 2 of the reception band of Band 3.

[0154] The first switch 680 is provided between the first antenna terminal 2a and the first switch 5a. The first switch 680 has a common terminal 681 and a plurality of (two in the illustrated example) selection terminals 682, 683. The common terminal 681 is electrically connected to the first antenna terminal 2a. The selection terminal 682 is electrically connected to the common terminal 51 of the first switch 5a without passing through the first filter 61. The selection terminal 683 is electrically connected to the first capacitor 65 of the first filter 61.

[0155] The first switch 680 selects at least one of the plurality of selection terminals 682, 683 as a connection destination of the common terminal 681. That is, the first switch 680 switches the path from the first antenna terminal 2a to the first switch 5a. In addition, the common terminal 681 is not limited to being directly connected to the antenna 9a. A filter or a coupler or the like can be provided between the common terminal 681 and the antenna 9a.

[0156] If the common terminal 681 and the selection terminal 683 are connected in the first switch 680, the reception signal of Band 3 (the first reception signal) passes through the first filter 61. Therefore, in a case where the common terminal 681 and the selection terminal 683 are connected, the first filter 61 is connected to the reception path of Band 3. On the other hand, if the common terminal 681 and the selection terminal 682 are connected in the first switch 680, the reception signal of Band 3 (the first reception signal) does not pass through the first filter 61. Therefore, in a case where the common terminal 681 and the selection terminal 682 are connected, the first filter 61 is not connected to the reception path, that is, the first switch 680 is a switch that switches connection and non-connection between the first filter 61 and the reception path of Band 3.

[0157] As with the 2nd filter 7H, the 2nd filter 71 is provided in the 2nd reception path R2 in front of the 2nd switch 5b. The 2nd filter 71 is, for example, a high-pass filter. As with the 2nd filter 7H of Embodiment 2, the 2nd filter 71 has a 1st capacitor 75, a 2nd capacitor 76, and an inductor 77. The 1st capacitor 75 and the 2nd capacitor 76 are connected in series on the 2nd reception path R2 and between the 2nd antenna terminal 2b and the 2nd switch 5b. One end of the inductor 77 is connected between the 1st capacitor 75 and the 2nd capacitor 76. The other end of the inductor 77 is connected to the ground. The 2nd filter 71 attenuates signals of a frequency band that is 1 / 2 of the frequency band belonging to n77. That is, the 2nd filter 71 attenuates signals of the transmission band of Band 3.

[0158] The 2nd switch 780 is provided between the 2nd antenna terminal 2b and the 2nd switch 5b. The 2nd switch 780 has a common terminal 781 and a plurality of (two in the illustrated example) selection terminals 782, 783. The common terminal 781 is electrically connected to the 2nd antenna terminal 2b. The selection terminal 782 is electrically connected to the common terminal 55 of the 2nd switch 5b without passing through the 2nd filter 71. The selection terminal 783 is electrically connected to the 1st capacitor 75 of the 2nd filter 71.

[0159] The 2nd switch 780 selects at least one of the plurality of selection terminals 782, 783 as a connection destination of the common terminal 781. That is, the 2nd switch 780 switches the path from the 2nd antenna terminal 2b to the 2nd switch 5b. In addition, the common terminal 781 is not limited to being directly connected to the antenna 9b. A filter or a coupler or the like can be provided between the common terminal 781 and the antenna 9b.

[0160] If the common terminal 781 and the selection terminal 783 are connected in the 2nd switch 780, the reception signal of n77 (the 2nd reception signal) passes through the 2nd filter 71. Therefore, in a case where the common terminal 781 and the selection terminal 783 are connected, the 2nd filter 71 is connected to the reception path of n77. On the other hand, if the common terminal 781 and the selection terminal 782 are connected in the 2nd switch 780, the reception signal of n77 (the 2nd reception signal) does not pass through the 2nd filter 71. Therefore, in a case where the common terminal 781 and the selection terminal 782 are connected, the 2nd filter 71 is not connected to the reception path, that is, the 2nd switch 780 is a switch that switches connection and non-connection between the 2nd filter 71 and the reception path of n77.

[0161] In the case of performing the simultaneous communication of Band 3 and n77, the 1st switch 680 connects the 1st antenna terminal 2a and the 1st filter 61. In the case of performing the simultaneous communication of Band 3 and n77, the 2nd switch 780 connects the 2nd antenna terminal 2b and the 2nd filter 71.

[0162] (2.2) Modified example 2

[0163] The high-frequency module 1H (of the reception module 100H) can also be provided with the 1st filter 6J and the 2nd filter 7J instead of the 1st filter 6H and the 2nd filter 7H. Figure 9B The 1st filter 6J and the 2nd filter 7J are shown.

[0164] Like the 1st filter 6H, the 1st filter 6J is provided in the 1st reception path R1 in front of the 1st switch 5a. The 1st filter 6J is, for example, a high-pass filter. The 1st filter 6J has a 1st capacitor 65, a 2nd capacitor 66, and an inductor 69. The 1st capacitor 65 and the 2nd capacitor 66 are connected in series on the 1st reception path R1 and between the 1st antenna terminal 2a and the 1st switch 5a. One end of the inductor 69 is connected between the 1st capacitor 65 and the 2nd capacitor 66. The other end of the inductor 69 is connected to the ground. The inductor 69 is a variable inductor configured to be able to change the value of the inductor 69. That is, the 1st filter 6J is configured so that the frequency band of the frequency of the signal to be attenuated is variable. The 1st filter 6J is able to change the frequency band of the signal to be attenuated by changing the value of the inductor 69. In this modified example, the value of the inductor 69 is set so that the signal of the frequency belonging to the 1 / 2 of the frequency band of the reception band of Band 3 is attenuated.

[0165] Like the 2nd filter 7H, the 2nd filter 7J is provided in the 2nd reception path R2 in front of the 2nd switch 5b. The 2nd filter 7J is, for example, a high-pass filter. The 2nd filter 7J has a 1st capacitor 75, a 2nd capacitor 76, and an inductor 79. The 1st capacitor 75 and the 2nd capacitor 76 are connected in series on the 2nd reception path R2 and between the 2nd antenna terminal 2b and the 2nd switch 5b. One end of the inductor 79 is connected between the 1st capacitor 75 and the 2nd capacitor 76. The other end of the inductor 79 is connected to the ground. The inductor 79 is a variable inductor configured to be able to change the value of the inductor 79. That is, the 2nd filter 7J is configured so that the frequency band of the frequency of the signal to be attenuated is variable. The 2nd filter 7J is able to change the frequency band of the signal to be attenuated by changing the value of the inductor 79. In this modified example, the value of the inductor 79 is set so that the signal of the frequency belonging to the 1 / 2 of the frequency band of n77 is attenuated.

[0166] With this structure, the frequency band of the signal attenuated by the second filter 7B can be changed according to the frequency band (transmission band) of the FDD communication which is simultaneously communicating with the TDD communication using n77 as the frequency band.

[0167] Furthermore, although in this modified example, inductors 69 and 79 are configured as variable inductors, this is not a limitation. At least one of the first capacitor 65 and the second capacitor 66 may also be configured as a variable capacitor. Additionally, at least one of the first capacitor 75 and the second capacitor 76 may also be configured as a variable capacitor. Alternatively, at least one of the first capacitor and the second capacitor, and the inductor, may be variable.

[0168] (2.3) Variation Example 3

[0169] like Figure 10 As shown, the high-frequency module 1H (receiving module 100H) can also replace the first filter 6H and the second filter 7H by having multiple (two of each in the illustrated example) first filters 6K and second filters 7K. Furthermore, when it is necessary to distinguish between the multiple first filters 6K, they are designated as first filters 605 and 606. Similarly, when it is necessary to distinguish between the multiple second filters 7K, they are designated as second filters 705 and 706.

[0170] Similar to the first filter 6H, a plurality of first filters 6K are disposed in the first receiving path R1 before the first switch 5a. The plurality of first filters 6K are, for example, high-pass filters. Similar to the first filter 6H in Embodiment 2, the plurality of first filters 6K have a first capacitor 65, a second capacitor 66, and an inductor 67. Between the first switch 5a and the first antenna terminal 2a, the first capacitor 65 and the second capacitor 66 are connected in series in the first receiving path R1 and between the first antenna terminal 2a and the first switch 5a. One end of the inductor 67 is connected between the first capacitor 65 and the second capacitor 66. The other end of the inductor 67 is connected to ground.

[0171] The multiple first filters 6K attenuate signals in different frequency bands. In other words, the multiple first filters 6K attenuate signals in different frequency bands. In this variant, the first filter 605 of the multiple first filters 6K attenuates signals with frequencies belonging to 1 / 2 of the receiving band of Band 3.

[0172] The first switching switch 680 is provided between the first antenna terminal 2a and the first switch 5a. The first switching switch 680 switches a path from the first antenna terminal 2a to the first switch 5a. The first switching switch 680 has a common terminal 681 and a plurality of (three in the illustrated example) selection terminals 682, 683, 684. The common terminal 681 is electrically connected to the first antenna terminal 2a. The selection terminal 682 is electrically connected to the common terminal 51 of the first switch 5a without passing through the first filter 6K. The selection terminal 683 is electrically connected to the first capacitor 65 of the first filter 605. The selection terminal 684 is electrically connected to the first capacitor 65 of the first filter 606. The first switching switch 680 selects at least one of the plurality of selection terminals 682, 683, 684 as a connection destination of the common terminal 681. In addition, the common terminal 681 is not limited to be directly connected to the antenna 9a. A filter or a coupler or the like can be provided between the common terminal 681 and the antenna 9a.

[0173] The plurality of second filters 7K are provided in the second reception path R2 in front of the second switch 5b, like the second filter 7H. The plurality of second filters 7K are, for example, high-pass filters. Like the second filter 7H of Embodiment 2, the plurality of second filters 71 have the first capacitor 75, the second capacitor 76, and the inductor 77. The first capacitor 75 and the second capacitor 76 are connected in series on the second reception path R2 and between the second antenna terminal 2b and the second switch 5b. One end of the inductor 77 is connected between the first capacitor 75 and the second capacitor 76. The other end of the inductor 77 is connected to the ground.

[0174] The signal frequency bands attenuated by the plurality of second filters 7K are different. In other words, the plurality of second filters 7K attenuate signals of different frequency bands from each other. In the present modification example, the second filter 705 of the plurality of second filters 7K attenuates signals of frequencies belonging to a frequency band of 1 / 2 of the reception band of n77.

[0175] The 2nd switching switch 780 is provided between the 2nd antenna terminal 2b and the 2nd switch 5b. The 2nd switching switch 780 switches a path from the 2nd antenna terminal 2b to the 2nd switch 5b. The 2nd switching switch 780 has a common terminal 781 and a plurality of (three in the illustrated example) selection terminals 782, 783, 784. The common terminal 781 is electrically connected with the 2nd antenna terminal 2b. The selection terminal 782 is electrically connected with the common terminal 55 of the 2nd switch 5b without passing through the 2nd filter 7K. The selection terminal 783 is electrically connected with the 1st capacitor 75 of the 2nd filter 705. The selection terminal 784 is electrically connected with the 1st capacitor 75 of the 2nd filter 706. The 2nd switching switch 780 selects at least one of the plurality of selection terminals 782, 783, 784 as a connection destination of the common terminal 781. In addition, the common terminal 781 is not limited to be directly connected with the antenna 9b. A filter or a coupler or the like can be provided between the common terminal 781 and the antenna 9b.

[0176] (2.4) Modification Example 4

[0177] The high-frequency module 1H (the reception module 100H) can also be provided with the 1st filter 6L, the 2nd filter 7L, the 1st switching switch 680, and the 2nd switching switch 780 instead of the 1st filter 6H and the 2nd filter 7H. Figure 11

[0178] Like the 1st filter 6H, the 1st filter 6L is provided in the 1st reception path R1 in front of the 1st switch 5a. The 1st filter 6L is, for example, a high-pass filter. The 1st filter 6L has a 1st capacitor 65, a 2nd capacitor 66, and an inductor 69. The 1st capacitor 65 and the 2nd capacitor 66 are connected in series on the 1st reception path R1 and between the 1st antenna terminal 2a and the 1st switch 5a. One end of the inductor 69 is connected between the 1st capacitor 65 and the 2nd capacitor 66. The other end of the inductor 69 is connected with the ground. The inductor 69 is a variable inductor configured to be able to change the value of the inductor 69. That is, the 1st filter 6L is configured to be able to change the frequency band of the frequency of the signal to be attenuated. The 1st filter 6L is able to change the frequency band of the signal to be attenuated by changing the value of the inductor 69. In the present modification example, the value of the inductor 69 is set so that the signal of the frequency belonging to a frequency band of 1 / 2 of the reception band of Band 3 is attenuated.

[0179] The 1st switching switch 680 is the same as the 1st switching switch 680 of the modification example 1 of the embodiment 2, and thus the description is omitted here.

[0180] ​As with the 2nd filter 7H, the 2nd filter 7L is provided in the 2nd reception path R2 in front of the 2nd switch 5b. The 2nd filter 7L is, for example, a high-pass filter. The 2nd filter 7L has a 1st capacitor 75, a 2nd capacitor 76, and an inductor 79. The 1st capacitor 75 and the 2nd capacitor 76 are connected in series on the 2nd reception path R2 and between the 2nd antenna terminal 2b and the 2nd switch 5b. One end of the inductor 79 is connected between the 1st capacitor 75 and the 2nd capacitor 76. The other end of the inductor 79 is connected to the ground. The inductor 79 is a variable inductor configured to be able to change the value of the inductor 79. That is, the 2nd filter 7L is configured so that the frequency band of the frequency of the signal to be attenuated is variable. The 2nd filter 7L is able to change the frequency band of the signal to be attenuated by changing the value of the inductor 79. In the present modification, the value of the inductor 79 is set so that the signal of the frequency belonging to the frequency band of 1 / 2 of the frequency band of n77 is attenuated.

[0181] The 2nd switch 780 is the same as the 2nd switch 780 of Modification 2 of Embodiment 2, and thus the description thereof is omitted here.

[0182] In addition, although the inductors 69 and 79 are set to be variable inductors in the present modification, the present application is not limited thereto. At least one of the 1st capacitor 65 and the 2nd capacitor 66 can also be set to be a variable capacitor. Furthermore, at least one of the 1st capacitor 75 and the 2nd capacitor 76 can also be set to be a variable capacitor. Alternatively, at least one of the 1st capacitor and the 2nd capacitor and the inductor can also be made variable.

[0183] Furthermore, the 1st filter 6L and the 2nd filter 7L of the present modification can also be applied to Modification 3 of Embodiment 2. That is, for the high-frequency module 1H (of the reception module 100H) of Modification 3 of Embodiment 2, the 1st filter 6L can also be applied instead of the 1st filter 6K of Modification 3 of Embodiment 2, and the 2nd filter 7L can also be applied instead of the 2nd filter 7K of Modification 3.

[0184] (2.5) Modification 5

[0185] Although the high-frequency module 1H is configured to include the reception module 100H in Embodiment 2 described above, the present application is not limited to this configuration. The high-frequency module 1H can also include a transceiver module instead of the reception module 100H. The transceiver module of the present modification can be realized by replacing the 1st filter 6 and the 2nd filter 7 in the high-frequency module 1 shown in FIG. 1 with the 1st filter 6H and the 2nd filter 7H shown in FIG. 6, respectively. Figure 5 Figure 8

[0186] ​​In the present modification, the first filter and the second filter of Modification 1 to 4 of Embodiment 2 can be applied instead of the filter of the present modification.

[0187] (2.6) Modification 6

[0188] Although in Modification 5 of Embodiment 1, the second receiving filter 4 and the second transmitting filter 4E (refer to Figure 5 ) are configured as independent filters, the configuration is not limited to this. The second receiving filter 4 and the second transmitting filter 4E can be configured by one filter.

[0189] The (transceiving module of the) high-frequency module 1 of the present modification can be realized by replacing the filter 7F in the high-frequency module 1 shown in Figure 6 with the second filter 7H shown in Figure 8 in the high-frequency module 1 shown in

[0190] In addition, in the (transceiving module of the) high-frequency module 1 of the present modification, the second filter of Modification 1 to 4 of Embodiment 2 can be applied instead of the second filter 7H of the present modification.

[0191] (2.7) Modification 7

[0192] Although in Embodiment 2 described above, the configuration is such that different antennas are used for the communication in the first communication band (Band 3) and the communication in the second communication band (n77), the configuration is not limited to this.

[0193] The same antenna can be used for the communication in the first communication band (Band 3) and the communication in the second communication band (n77). In this case, the (transceiving module of the) high-frequency module 1 of the present modification can be realized by replacing the filter 7G in the high-frequency module 1 shown in Figure 7 with the second filter 7H shown in Figure 8 in the high-frequency module 1 shown in

[0194] In addition, in the high-frequency module of the present modification, the second filter of Modification 1 to 4 described above can be applied instead of the second filter 7H of the present modification.

[0195] (2.8) Modification 8

[0196] Although in Embodiment 2 described above, the first filter 6H is configured to attenuate the signal of the frequency belonging to the frequency band of 1 / 2 of the receiving band of the first communication band (Band 3), the configuration is not limited to this. The first filter 6H can be configured to attenuate the signal of the frequency belonging to the frequency band lower than the receiving band of the first communication band (Band 3).

[0197] Likewise, the 2nd filter 7H can also be a structure that attenuates a signal of a frequency belonging to a frequency band lower than the frequency band of the 2nd communication band (n77).

[0198] Likewise, the 1st filters explained in Modification Examples 1 to 5 of Embodiment 2 can also be structures that attenuate a signal of a frequency belonging to a frequency band lower than the reception band of the 1st communication band (Band 3). Likewise, the 2nd filters explained in Modification Examples 1 to 5 of Embodiment 2 can also be structures that attenuate a signal of a frequency belonging to a frequency band lower than the frequency band of the 2nd communication band (n77).

[0199] Likewise, the filters explained in Modification Examples 6 and 7 of Embodiment 2 can also be structures that attenuate a signal of a frequency belonging to a frequency band lower than the frequency band of the 2nd communication band (n77).

[0200] (Summary)

[0201] As explained above, the high-frequency module (1; 1H) of the 1st aspect includes a switch (for example, the 2nd switch 5b, the path switching switch 560), a reception filter (for example, the 2nd reception filter 4), a low-noise amplifier (for example, the 2nd low-noise amplifier 8b), and a filter (for example, the 2nd filter 7; 7A; 7B; 7C; 7D; 7H; 7I; 7J; 7K; 7L, the filter 7G). The switch switches a transmission path of a transmission signal and a reception path of a reception signal in a communication based on a time-division multiplexing system. The reception filter is provided at a stage subsequent to the switch and passes a reception signal of a given frequency band. The low-noise amplifier amplifies the reception signal that has passed through the reception filter. The filter is provided at a stage anterior to the switch in the reception path (for example, the 2nd reception path R2).

[0202] According to this structure, a signal of an unnecessary frequency band is attenuated by the filter, and thus a harmonic of the signal of the unnecessary frequency band caused by a nonlinear characteristic of the switch is not generated. Therefore, it is possible to further suppress a decrease in reception sensitivity.

[0203] The high-frequency module (1) of the 2nd aspect includes a switch (for example, the antenna switch 500), a transceiving filter (4F), a low-noise amplifier (for example, the 2nd low-noise amplifier 8b), and a filter (for example, the filter 7F). The switch switches a connection destination with the antenna terminal (2). The transceiving filter (4F) is provided at a stage subsequent to the switch and passes a reception signal of a given frequency band and a transmission signal of a given frequency band. The low-noise amplifier amplifies the reception signal that has passed through the transceiving filter (4F). The filter is provided at a stage anterior to the switch in a reception path (for example, the path R21) of the reception signal.

[0204] According to this structure, the signal of the unnecessary frequency band is attenuated by the filter, and thus a harmonic of the signal of the unnecessary frequency band caused by the nonlinear characteristic of the switch is not generated. Therefore, the decrease in the reception sensitivity can be further suppressed.

[0205] The high-frequency module (1; 1H) of the 3rd aspect further includes a switching switch (63; 650) in the 1st or 2nd aspect. The switching switch (for example, the 2nd switching switch 73; 780) switches the connection and disconnection between the filter (for example, the 2nd filter 7A; 7C; 7D; 7I; 7K; 7L) and the reception path.

[0206] According to this structure, the connection and disconnection of the filter and the reception path can be switched according to the mode of communication.

[0207] In the high-frequency module (1; 1H) of the 4th aspect, in any one of the 1st to 3rd aspects, the filter (for example, the 2nd filter 7B; 7D; 7J; 7L) is configured to be variable in the frequency band of the signal to be attenuated.

[0208] According to this structure, the frequency band of the signal to be attenuated by the filter can be changed according to the mode of communication. For example, when simultaneous communication by TDD and FDD is performed, the frequency band of the signal to be passed through the filter can be changed according to the frequency band used in FDD. Specifically, the frequency band of the signal to be passed through the filter and the transmission band used in FDD can be made the same.

[0209] In the high-frequency module (1; 1H) of the 5th aspect, in the 3rd aspect, a plurality of filters (for example, the 2nd filters 7C; 7K) and a group of switching switches are included. The frequency bands of the signals to be attenuated by the plurality of filters are different.

[0210] According to this structure, the filter connected to the reception path can be switched according to the mode of communication. For example, when simultaneous communication by TDD and FDD is performed, the filter connected to the reception path can be switched according to the frequency band used in FDD. Specifically, in a case where Bandl and Band3 exist as the frequency band used in FDD, the filter connected to the reception path when Bandl is used and the filter connected to the reception path when Bandl is used can be switched.

[0211] In the high-frequency module (1; 1H) of the 6th aspect, in any one of the 1st to 5th aspects, the filter attenuates the signal of a 2nd frequency band lower than a 1st frequency band that is a given frequency band.

[0212] According to this structure, the decrease in the reception sensitivity can be further suppressed.

[0213] In the high-frequency module (1; 1H) of the 7th mode, in the 6th mode, the 2nd frequency band contains a frequency that is half of the frequency of the received signal.

[0214] According to this structure, a 2nd harmonic of the signal of the useless frequency band caused by the non-linear characteristic of the switch is not generated. Therefore, by providing the filter, it is possible to prevent the generation of the 2nd harmonic of the signal of the useless frequency band.

[0215] In the high-frequency module (1; 1H) of the 8th mode, in any one of the 1st to 7th modes, the filter is a notch filter (for example, the 2nd filter 7; 7A; 7B; 7C; 7D, the filter 7G) or a high-pass filter (for example, the 2nd filter 7H; 7I; 7J; 7K; 7L).

[0216] According to this structure, it is possible to attenuate the signal of the useless frequency band by the filter.

[0217] The communication device (10; 10H) of the 9th mode is provided with: the high-frequency module (1; 1H) of any one of the 1st to 8th modes; and a signal processing circuit (80) that performs signal processing of the signal that passes through the high-frequency module (1; 1H).

[0218] According to this structure, it is possible to further suppress the decrease in the reception sensitivity.

[0219] Explanation of Reference Numerals

[0220] 1, 1H: high-frequency module;

[0221] 2: antenna terminal;

[0222] 2a: 1st antenna terminal;

[0223] 2b: 2nd antenna terminal;

[0224] 3: 1st reception filter;

[0225] 3E: 1st transmission filter;

[0226] 3F: reception filter;

[0227] 4: 2nd reception filter;

[0228] 4E: 2nd transmission filter;

[0229] 4F: transceiving filter;

[0230] 5: switch;

[0231] 5a: 1st switch;

[0232] 5b: 2nd switch;

[0233] 6, 6A, 6B, 6C, 6D, 6H, 6I, 6J, 6K, 6L, 601, 602, 605, 606: 1st filter

[0234] 7, 7A, 7B, 7C, 7D, 7H, 7I, 7J, 7K, 7L, 701, 702, 705, 706: 2nd filter

[0235] 7F, 7G: filter

[0236] 8: amplifier

[0237] 8a: 1st low noise amplifier

[0238] 8b: 2nd low noise amplifier

[0239] 8c: 2nd power amplifier (power amplifier)

[0240] 8d: 1st power amplifier

[0241] 9, 9a, 9b: antenna

[0242] 10, 10H: communication device

[0243] 51, 55: common terminal

[0244] 52, 56, 57: selection terminal

[0245] 61, 71: inductor

[0246] 62, 62B, 62D, 72, 72B, 72D: capacitor

[0247] 63: 1st switching switch

[0248] 65, 75: 1st capacitor

[0249] 66, 76: 2nd capacitor

[0250] 67, 69, 77, 79: inductor

[0251] 73: 2nd switching switch

[0252] 80: signal processing circuit

[0253] 81: baseband signal processing circuit

[0254] 82: RF signal processing circuit

[0255] 100, 100G, 100H: reception module

[0256] 100E, 100F: transceiver module

[0257] 500, 550: antenna switch

[0258] 510: switch

[0259] 560: path switch

[0260] 680: 1st switch

[0261] 780: 2nd switch

[0262] 501, 511, 551, 561, 681, 781: common terminal

[0263] 502, 503, 512, 513, 552, 553, 562, 563, 682, 683, 684, 782, 783, 784: selection terminal

[0264] R1: 1st reception path

[0265] R2: 2nd reception path

[0266] R3: transmission path

[0267] R11: 3rd reception path

[0268] R21: path

[0269] R22: reception path

[0270] R32: transmission path

Claims

1. A high-frequency module comprising: a switch that switches a transmission path of a transmission signal and a reception path of a reception signal in communication based on a time division multiplexing system; a reception filter that is provided at a stage subsequent to the switch and passes the reception signal of a given frequency band; a low noise amplifier that amplifies the reception signal that has passed through the reception filter; and a filter that is provided at a stage anterior to the switch in the reception path, the filter attenuating a signal of a second frequency band that is lower than a first frequency band that is the given frequency band.

2. The high-frequency module according to claim 1, further comprising a switching switch that switches connection and non-connection between the filter and the reception path.

3. The high-frequency module according to claim 1 or 2, wherein the filter is configured so that the frequency band of the signal to be attenuated is variable.

4. The high-frequency module according to claim 2, comprising a plurality of sets of the filter and the switching switch, the frequency bands of the signals to be attenuated by the plurality of filters being different.

5. The high-frequency module according to claim 1, further comprising an antenna switch that switches a connection destination with an antenna terminal, the filter being provided between the antenna switch and the switch.

6. The high-frequency module according to claim 1, wherein the second frequency band includes a frequency that is half of a frequency of the reception signal.

7. The high-frequency module according to claim 1 or 2, wherein the filter is a notch filter or a high-pass filter.

8. A high-frequency module comprising: a switch that switches a connection destination with an antenna terminal; a transceiving filter that is provided at a stage subsequent to the switch and passes a reception signal of a given frequency band and a transmission signal of the given frequency band; a low noise amplifier that amplifies the reception signal that has passed through the transceiving filter; and a filter that is provided at a stage anterior to the switch in a reception path of the reception signal, the filter attenuating a signal of a second frequency band that is lower than a first frequency band that is the given frequency band.

9. The high-frequency module according to claim 8, further comprising a switching switch that switches connection and non-connection between the filter and the reception path.

10. The high-frequency module according to claim 8 or 9, wherein the filter is configured so that the frequency band of the signal to be attenuated is variable.

11. The high-frequency module according to claim 9, comprising a plurality of sets of the filter and the switching switch, the frequency bands of the signals to be attenuated by the plurality of filters being different.

12. The high-frequency module according to claim 8, wherein the second frequency band includes a frequency that is half of a frequency of the reception signal.

13. The high-frequency module according to claim 8 or 9, wherein the filter is a notch filter or a high-pass filter.

14. A communication device comprising: the high-frequency module according to any one of claims 1 to 13; and a signal processing circuit that performs signal processing of a signal that has passed through the high-frequency module. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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