Compact Diplexer

A radio frequency (RF) transceiver of a wireless communication device, for receiving and transmitting a first bandwidth signal corresponding to a first central frequency, and a second bandwidth signal corresponding to a second central frequency, the RF transceiver comprising:

• an antenna for receiving and transmitting the first bandwidth signal and the second bandwidth signal;
• a first RF signal process unit, for processing the first bandwidth signal;
• a second RF signal process unit, for processing the second bandwidth signal;
• a diplexer coupled to the antenna, the diplexer comprising:
• a first impedance unit comprising a first end coupled to the first signal end, and a second end, the first impedance unit forming an impedance match with the third impedance unit when the third signal end receives or transmits the first bandwidth signal, and forming a high impedance unit when the third signal end receives or transmits the second bandwidth signal;
• a second impedance unit comprising a first end coupled to the second signal end, and a second end, the second impedance unit forming an impedance match with the third impedance unit when the third signal end receives or transmits the second bandwidth signal, and forming a high impedance unit when the third signal end receives or transmits the first bandwidth signal;
• and
• a third impedance unit comprising a first end coupled to the antenna and a second end coupled to the second end of the first impedance unit and the second end of the second impedance unit.