UHF DUPLEXERS.

A three port ferrite circulator was developed that successfully demonstrated a power handling capability of 500 KW peak power and 10 KW average power. The insertion loss is less than 0.5 db over the band 400 to 450 mc. For receiver protection after the ferrite circulator, a solidstate diode limiter was developed. The insertion loss of the limiter is less than 0.8 db over the 400 to 450 mc band. A power handling capability of 150 KW peak and 1.5 KW average was demonstrated with a 60 microsec pulse width. A leakage power of 300 mw peak was obtained with no spike leakage. For the 200 to 225 mc band, a complete solid-state diode limiter has been achieved that can successfully switch 200 KW peak power, 2 KW average power, with a 200 microsec pulse width. A transmit loss of 0.1 db and a receive loss of 2.2 db was obtained with a leakage power of 13 mw peak to the receiver. Author