There is disclosed a multiplexer comprising: a first port; a second port; a third port connected to the first port and the second port; a fourth port connected to the first port and the second port; and a transformer connected at the first port, and having a first winding connected between the first port and one of the third and fourth ports and a second winding connected to the other of the third and fourth ports and electrical ground, wherein one of the first to fourth ports is for connection to an antenna, the multiplexer further comprising: a transmit filter connected between the port for connection to the antenna and one of ports to which that port is connected; and a receive filter connected between the port for connection to the antenna and the other of the ports. A cancellation circuit connected between the third and fourth ports, comprises a plurality of parallel channels between the second receive and transmit filters, each channel including a filter.
Multiplexer transformer
12.01.2022
Patent
Elektronische Ressource
Englisch
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