Diplexer and Transceiver thereof

A transceiver of a wireless communication device, for coupling a first radio frequency (RF) signal corresponding to a first carrier frequency and a second RF signal corresponding to a second carrier frequency, the transceiver comprising:

• a first signal processing unit, for processing the first RF signal;
• a second signal processing unit, for processing the second RF signal;
• a diplexer, comprising:
• a first port arranged to couple the first RF signal;
• a second port arranged to couple the second RF signal;
• a third port capable of connecting an antenna;
• a first impedance unit coupled to the first port and the third port;
• and
• a second impedance unit coupled to the second port and the third port;
• wherein the first port, the second port and the third port are coupled to a DC ground;
• wherein the first impedance unit is arranged to provide an first open-circuit impedance against the second RF signal and the second impedance is arranged to provide a second open-circuit impedance against the first RF signal.

A diplexer for transmitting at least one radio frequency (RF) signal, each RF signal corresponding to a carrier frequency, the diplexer comprising:

• at least one input port arranged to couple at least one RF signal;
• at least one output port, each output port is capable of connecting an antenna;
• and
• at least one impedance unit coupled between a first input port of the at least one input port and a first output port of the at least one output port;
• wherein each input port and output port are coupled to a DC ground;
• wherein the at lease one impedance unit is arranged to provide a short-circuit impedance against one of the at least one RF signal.