The multipactor is a rather unique receiver protector form. The technology originated many years ago at General Electric. It was then acquired by Hughes Aircraft who developed it into a realizable technology for production systems.
The multipactor is a pre-limiting device, which serves the same function in a radar system as a Pre-TR, TR tube, or Ferrite Limiter. It provides significant protection against high power signals, but not enough to adequately protect a receiver. Therefore, a multipactor must be followed by a diode limiter for complete receiver protection.
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