A Coincidence Region Power Limiter Using Monocrystal Lithium Ferrite at 6500 Mc/s

Passive Microwave power limiters that use narrow linewidth ferrimagnetic materials such as YIG and gallium-substituted YIG operating in the coincidence region have been previously reported. However, these limiters have been restricted to operating in the L- and S-band ranges because of the low ferrite saturation magnetization (4/spl pi/M/sub s/ ). Recently, monocrystal lithium ferrite having a 4/spl pi/M/sub s/of 3900 and exhibiting relatively narrow line-width properties has become available. We have used this material in the development of a coincidence power limiter that operates in the 6500-Mc/s frequency range. (Independent work on coincidence limiting using lithium at 5200 Mc /s, has recently been reported by Rossol.