Multiplexer and communication device

Abstract

A multiplexer includes: a common filter, a first filter connected to the common terminal and having a passband including a reception band of a first communication band; a second filter connected to the common terminal and having a passband including a transmission band of the first communication band; a third filter connected to the common terminal and having a passband including a transmission band of a second communication band; and a fourth filter connected to the common terminal and having a passband including a reception band of the second communication band. The transmission band of the first communication band and the transmission band of the second communication band are located between the reception band of the first communication band and the reception band of the second communication band, and at least one of the first communication band or the second communication band is a 5G-NR communication band.

1 . A multiplexer configured to simultaneously transfer a radio frequency signal in a first communication band and a radio frequency signal in a second communication band different from the first communication band, the multiplexer comprising:
 a common terminal;   a first filter connected to the common terminal, the first filter having a passband including a reception band of the first communication band;   a second filter connected to the common terminal, the second filter having a passband including a transmission band of the first communication band;   a third filter connected to the common terminal, the third filter having a passband including a transmission band of the second communication band; and   a fourth filter connected to the common terminal, the fourth filter having a passband including a reception band of the second communication band, wherein:   the transmission band of the first communication band and the transmission band of the second communication band are located between the reception band of the first communication band and the reception band of the second communication band,   at least one of the first communication band or the second communication band is a 5G-NR communication band,   the first filter includes a first input or output terminal connected to the common terminal,   the second filter includes a second input or output terminal connected to the common terminal,   the third filter includes a third input or output terminal connected to the common terminal,   the fourth filter includes a fourth input or output terminal connected to the common terminal,   each of the first communication band and the second communication band is a 5G-NR communication band, and   the passband of the first filter, the second filter, the third filter, or the fourth filter is a time division duplexing (TDD) band that supports TDD.   
     
     
         2 . A multiplexer configured to simultaneously transfer a radio frequency signal in a first communication band and a radio frequency signal in a second communication band different from the first communication band, the multiplexer comprising:
 a common terminal;   a first filter connected to the common terminal, the first filter having a passband including a reception band of the first communication band;   a second filter connected to the common terminal, the second filter having a passband including a transmission band of the first communication band;   a third filter connected to the common terminal, the third filter having a passband including a transmission band of the second communication band; and   a fourth filter connected to the common terminal, the fourth filter having a passband including a reception band of the second communication band, wherein:   the transmission band of the first communication band and the transmission band of the second communication band are located between the reception band of the first communication band and the reception band of the second communication band,   at least one of the first communication band or the second communication band is a 5G-NR communication band,   the first filter includes a first input or output terminal connected to the common terminal,   the second filter includes a second input or output terminal connected to the common terminal,   the third filter includes a third input or output terminal connected to the common terminal,   the fourth filter includes a fourth input or output terminal connected to the common terminal,   the first communication band is a 5G-NR communication band,   the second communication band is a 4G-LTE communication band, and   the passband of the first filter, the second filter, the third filter, or the fourth filter is a time division duplexing (TDD) band that supports TDD.   
     
     
         3 . The multiplexer according to  claim 1 , wherein the common terminal, the first filter, the second filter, the third filter, and the fourth filter are mounted on a same board. 
     
     
         4 . The multiplexer according to  claim 1 , wherein:
 each of the first filter, the second filter, the third filter, and the fourth filter is an acoustic wave filter, and   the common terminal, the first filter, the second filter, the third filter, and the fourth filter are mounted on a same piezoelectric board.   
     
     
         5 . The multiplexer according to  claim 1 , wherein a frequency gap between the transmission band of the first communication band and the transmission band of the second communication band is narrower than a transmission band width of the first communication band. 
     
     
         6 . The multiplexer according to  claim 1 , wherein:
 at least two of the passbands of the first filter, the second filter, the third filter, or the fourth filter are TDD bands and support different power modes, and   the power modes include a high power mode and a low power mode, the multiplexer being configured to operate at a higher power in the high power mode than in the low power mode.   
     
     
         7 . The multiplexer according to  claim 1 , wherein the high power mode is a mode that supports communication in power class 3 or power class 2. 
     
     
         8 . The multiplexer according to  claim 1 , wherein:
 a length of a signal line connecting the second input or output terminal and the common terminal is less than or equal to a length of a signal line connecting the first input or output terminal and the common terminal and is less than or equal to a length of a signal line connecting the fourth input or output terminal and the common terminal, and   a length of a signal line connecting the third input or output terminal and the common terminal is less than or equal to the length of the signal line connecting the first input or output terminal and the common terminal and is less than or equal to the length of the signal line connecting the fourth input or output terminal and the common terminal.   
     
     
         9 . A communication device, comprising:
 an antenna;   an RF signal processing circuit configured to process a radio frequency signal which is transmitted or received by the antenna; and   the multiplexer according to  claim 1  configured to transfer the radio frequency signal between the antenna and the RF signal processing circuit.   
     
     
         10 . The multiplexer according to  claim 2 , wherein the common terminal, the first filter, the second filter, the third filter, and the fourth filter are mounted on a same board. 
     
     
         11 . The multiplexer according to  claim 2 , wherein:
 each of the first filter, the second filter, the third filter, and the fourth filter is an acoustic wave filter, and   the common terminal, the first filter, the second filter, the third filter, and the fourth filter are mounted on a same piezoelectric board.   
     
     
         12 . The multiplexer according to  claim 2 , wherein a frequency gap between the transmission band of the first communication band and the transmission band of the second communication band is narrower than a transmission band width of the first communication band. 
     
     
         13 . The multiplexer according to  claim 2 ,
 wherein the first communication band is 5G-NR n8 and the second communication band is 4G-LTE Band 20.   
     
     
         14 . The multiplexer according to  claim 13 , wherein the passband of the fourth filter includes a reception band of 5G-NR n28. 
     
     
         15 . The multiplexer according to  claim 2 , wherein:
 the first communication band is 5G-NR n26, and   the second communication band is 4G-LTE Band 13.   
     
     
         16 . The multiplexer according to  claim 2 , wherein:
 at least two of the passbands of the first filter, the second filter, the third filter, or the fourth filter are TDD bands and support different power modes, and   the power modes include a high power mode and a low power mode, the multiplexer being configured to operate at a higher power in the high power mode than in the low power mode.   
     
     
         17 . The multiplexer according to  claim 16 , wherein the high power mode is a mode that supports communication in power class 3 or power class 2. 
     
     
         18 . The multiplexer according to  claim 2 , wherein a length of a signal line connecting the second input or output terminal and the common terminal is less than or equal to a length of a signal line connecting the first input or output terminal and the common terminal, and is less than or equal to a length of a signal line connecting the third input or output terminal and the common terminal, and is less than or equal to a length of a signal line connecting the fourth input or output terminal and the common terminal. 
     
     
         19 . The multiplexer according to  claim 2 , wherein:
 a length of a signal line connecting the second input or output terminal and the common terminal is less than or equal to a length of a signal line connecting the first input or output terminal and the common terminal and is less than or equal to a length of a signal line connecting the fourth input or output terminal and the common terminal, and   a length of a signal line connecting the third input or output terminal and the common terminal is less than or equal to the length of the signal line connecting the first input or output terminal and the common terminal and is less than or equal to the length of the signal line connecting the fourth input or output terminal and the common terminal.   
     
     
         20 . A communication device, comprising:
 an antenna;   an RF signal processing circuit configured to process a radio frequency signal which is transmitted or received by the antenna; and   the multiplexer according to  claim 2  configured to transfer the radio frequency signal between the antenna and the RF signal processing circuit.