Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1992-03-31
1994-02-22
Lee, Benny
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333262, 307571, H01P 115
Patent
active
052891429
ABSTRACT:
A transmit/receive (T/R) module of an electrically steered phased array antenna having a receiver comprising a T/R switch, an impedance matching and bias feed network, and a low noise amplifier. The T/R switch comprises a .pi. network to provide a matched termination for protecting the receiver in the transmit mode. This .pi. network emulates a one-eighth wavelength transmission line by providing a 45 degree phase delay, but it exhibits the isolation and bandwidth characteristics of a one-quarter wavelength line. The T/R switch effectively isolates the low noise amplifier from an antenna during transmit mode and uses less than half the area on a substrate typically required for a conventional one-quarter wavelength transmission line. In a receive mode the T/R switch has minimal effect on an RF input signal passing through it.
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Dawson Walter F.
Lee Benny
Raytheon Company
Sharkansky Richard M.
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