Frequency Selective High Power YIG Limiters

This paper describes a bulk-type YIG limiter that provides narrow-band limiting for above-threshold microwave signals and simultaneously provides low loss transmission of below-threshold signals over a broad instantaneous bandwidth. Such a device has broad application as a frequency-selective receiver protector in FM/CW RADARs, for overload limiting in communication receivers, or as a replacement for the fixed filter in missile firing RADARs, thereby increasing frequency agility. A theoretically derived expression for selectivity bandwidth is found to agree well with experimental results.