Patent ID: 6308051
Filing Date: 2001-10-23
Classification: H01P

Abstract:
An antenna duplexer, comprising:a transmitting terminal;a receiving terminal;an antenna terminal;a transmitting circuit electrically connected between said transmitting terminal and said antenna terminal, said transmitting circuit comprising at least one first resonator and a first element electrically connected to said first resonator and electrically changing a capacitance thereof by a control voltage, said first element switching at least two different passing bands of the transmitting circuit by the control voltage; anda receiving circuit electrically connected between said receiving terminal and said antenna terminal, said receiving circuit comprising at least one second resonator, a second element electrically connected to said second resonator and electrically changing a capacitance thereof by a control voltage, said second element switching at least two different passing bands of the receiving circuit by the control voltage, and at least one surface acoustic wave filter element coupled thereto.