Ferrite power limiter for radio set AN/GRC-144

This investigation describes analytical and experimental results obtained on a C-band ferrite limiter which utilizes a YIG rod inserted along the longitudinal axis of a coupled dielectric resonator bandpass structure. This device is aimed at providing receiver front-end protection for communication systems such as the AN/GRC-144 which operate in a dense, high signal power environment. By utilizing a long, thin, single crystal YIG rod instead of YIG spheres, the limiter dynamic range has been extended from 20 db to 35 db. The threshold power varies from 5 dbm at 4.4 GHz to 15 dbm at 5.0 GHz with an insertion loss of less than 1.0 db across the band.