Donald N Jessen

US Patent:

46370730, Jan 13, 1987

Filed:

Jun 25, 1984

Appl. No.:

6/624490

Inventors:

John R. Selin - Stow MA
Donald N. Jessen - Sudbury MA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H04B 144
H01P 110
H03G 900

US Classification:

455 78

Abstract:

A transceiver transmit/receive (T/R) switching arrangement for electrically decoupling the transceiver's receiver circuit from first and second transceiver ports during transmission, and for electrically decoupling the transceiver's transmitter circuit from the first and second transceiver ports during reception. Each such circuit includes an amplifier for amplifying an applied microwave signal and operating with a relatively high output impedance when power is applied thereto. Each amplifier is inhibited from amplifying an applied microwave signal when power is removed therefrom. First bias means switchably applies power to the transmitter amplifier during transmission and removes power from the transmitter amplifier during reception to switch the relatively high output impedance of such amplifier to a relatively low output impedance. Second bias means switchably applies power to the receiver amplifier during reception and removes power from the receiver amplifier during transmission to switch the relatively high output impedance of such amplifier to a relatively low output impedance. Additional circuitry in the transmitter circuit couples the amplified microwave signal from the transmitter amplifier to the second transceiver port during transmission, and transforms the relatively low output impedance of the transmitter amplifier to a relatively high impedance at the second transceiver port during reception.