Overpower protection for a radio frequency transceiver
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United States of America Patent
Stats
-
Feb 3, 1987
Grant Date -
N/A
app pub date -
Aug 23, 1984
filing date -
Aug 23, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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