Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Reexamination Certificate
2008-05-13
2008-05-13
Vo, Nguyen T. (Department: 2618)
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
C455S083000, C333S101000
Reexamination Certificate
active
07373115
ABSTRACT:
A transmit-receive (T/R) switch for coupling a TDD transceiver to an antenna. The T/R switch comprises 1) a first circulator having a first port for receiving a transmit signal from the transceiver during transmit mode, a second port for sending the transmit signal to the antenna during transmit mode and receiving a received signal from the antenna during receive mode, and a third port for sending the received signal towards the transceiver during receive mode. The T/R switch further comprises 2) a second circulator having a first port for receiving the received signal from the third port of the first circulator during receive mode and a second port for sending the received signal towards the transceiver during receive mode, and 3) a termination load coupled to a third port of the second circulator. The circulators divert RF energy reflected from the antenna during transmit mode into the termination load.
REFERENCES:
patent: 5701595 (1997-12-01), Green, Jr.
patent: 6072994 (2000-06-01), Phillips et al.
patent: 6226275 (2001-05-01), Yang et al.
patent: 6374094 (2002-04-01), Zappala
patent: 6567648 (2003-05-01), Ahn et al.
patent: 7236519 (2007-06-01), Kubo et al.
Samsung Electronics Co,. Ltd.
Vo Nguyen T.
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