Single-block filter for antenna duplexing and antenna-summed...

Details Single-block filter for antenna duplexing and antenna-summed... Single-block filter for antenna duplexing and antenna-summed...

H - Electricity

04

B

325/1, 333/46

H04B 1/40 (2006.01)

Patent

CA 2022278

SINGLE-BLOCK FILTER FOR ANTENNA DUPLEXING AND ANTENNA-SUMMED DIVERSITY Abstract of the Disclosure A single-block ceramic filter (102) is coupled to two antennas (142 and 144) for providing both antenna duplexing and antenna-summed diversity in a duplex radio transceiver (100). One antenna (142) is coupled by the filter (102) to a transmitter (132) and to a receiver (130), and a second antenna (144) is switchably coupled by the filter (102) to the receiver (130) by diversity control circuitry (101) in response to a diversity control signal (137). A microcomputer (134) in the transceiver (100) is coupled to the receiver (130) for monitoring the received signal strength (135). When the received signal strength (135) drops in level indicating that the signal being received on the antennas (142 or 144) has become degraded due to fading or other interference, the microcomputer (134) changes the binary state of the diversity control signal (137) for switching the receiver (130) between antenna (142) and both antennas (142 and 144).

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