Abstract: A frequency tunable transmit/receive (Tx/Rx) antenna switch uses a tuned PIN diode RF switch topology (e.g. shunt, series or series-shunt). Frequency tunability may be provided for either a transmit or a receive port (or both) that is tuned by a quarter-wavelength transmission line. The quarter-wavelength (?c/4) line establishes a passband centered about a center frequency fc. An electronically tunable LC tank circuit adds capacitance to the switch impedance to shift the center frequency fc to lower frequencies and progressively narrow the passband with the addition of more capacitance. Transceiver units provided with frequency tunable Tx/Rx antenna switches can, for example, be used in a Master/Slave network in which multiple units communicate with each other or in an autonomous network in which each of the multiple units operate independently.

Abstract: A frequency tunable transmit/receive (Tx/Rx) antenna switch uses a tuned PIN diode RF switch topology (e.g. shunt, series or series-shunt). Frequency tunability may be provided for either a transmit or a receive port (or both) that is tuned by a quarter-wavelength transmission line. The quarter-wavelength (?c/4) line establishes a passband centered about a center frequency fc. An electronically tunable LC tank circuit adds capacitance to the switch impedance to shift the center frequency fc to lower frequencies and progressively narrow the passband with the addition of more capacitance. Transceiver units provided with frequency tunable Tx/Rx antenna switches can, for example, be used in a Master/Slave network in which multiple units communicate with each other or in an autonomous network in which each of the multiple units operate independently.