Multiplex communications – Duplex – Communication over free space
Patent
1996-09-06
1999-07-13
Patel, Ajit
Multiplex communications
Duplex
Communication over free space
455 83, H04J 300
Patent
active
059236477
ABSTRACT:
A communications apparatus for coupling a transmitter and receiver for duplex transmission is disclosed. The apparatus comprises a transmitter with a transmit power amplifier, a receiver with a receive filter, and a circulator with a plurality of ports, wherein the transmit power amplifier is connected to a first port of the circulator and the receiver filter is connected to a second port of the circulator. An antenna is demountably connected to a third port of the circulator. A switch alternately connects a load and the receiver to the second port of the circulator, wherein the receiver is connected to the second port of the circulator during reception of signals and the load is connected to the second port of the circulator during transmission so as to absorb power reflected by the antenna.
REFERENCES:
patent: 4380822 (1983-04-01), Broton
patent: 5347241 (1994-09-01), Panaretos et al.
patent: 5590412 (1996-12-01), Sawai et al.
patent: 5701595 (1997-12-01), Green, Jr.
patent: 5760665 (1998-06-01), Turunen et al.
Patent Abstracts of Japan, vol. 96, No. 11, Nov. 29, 1996 & JP 08 195695 A (MURATA MFG CO LTD), Jul. 30, 1996.
Patent Abstracts of Japan, vol. 14, No. 502 (E-0997), Nov. 2, 1990 & JP 02 209024 A (SEIKO EPSON CORP) Aug. 20, 1990.
Dolman Rodney A.
Rogers Terrence E.
Ericsson Inc.
Lee Chiho Andrew
Patel Ajit
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