Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1984-08-23
1987-02-03
Ng, Jin F.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 80, 455 82, 455 83, 455217, H04B 148
Patent
active
046413650
ABSTRACT:
A power limiter circuit for a radio frequency transceiver of the type having a single input-output antenna port is comprised of an isolator, first and second three port circulators and a pair of PIN diodes. One port of the first circulator is connected to the antenna port and one port of the second circulator is coupled to a transmit/receive antenna. The second ports of the two circulators are connected together through the isolator for passing signal from the transceiver to the antenna and the third ports of the two circulators are connected together for passing signal from the antenna to the transceiver. The PIN diodes, arranged in inverse parallel relationship, are connected between the third ports and circuit ground and operate in connunction with the isolator to limit to a safe value the signal passed from the antenna to the transceiver.
REFERENCES:
patent: 3202986 (1965-08-01), Cordry
patent: 3309698 (1967-03-01), Baldock
patent: 4158814 (1979-06-01), Imazeki et al.
patent: 4361819 (1982-11-01), Sillard et al.
patent: 4380822 (1983-04-01), Broton
Ng Jin F.
RCA Corporation
Seidenglanz Elissa
Smiley Raymond E.
Tripoli Joseph S.
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