Planar limiters and receiver protectors

A range of new limiter and receiver protector devices is described, comprising planar device structures in drop-in and packaged surface-mount constructions. Low-loss, low leakage limiters are presented, spanning L (1.1 GHz), S (3 GHz) X (9 GHz) and Ku (16 GHz) frequency bands. Device designs are also shown which feature switching, sensitivity time control (STC) attenuation and noise sources as additional functionality integrated within the planar limiter module.