High frequency limiter

Abstract

In order to provide a high-frequency limiter capable of absorbing variation in characteristic parameters of a PIN diode to acquire a desired limiting characteristic, an external re-entrant coaxial cavity is constituted by an external pedestal 15 and a cavity 34 inside a lower conductor part 13 and an upper conductor part 14, and an internal re-entrant coaxial cavity is constituted by an inner wall of the external pedestal 15 and by an internal pedestal 16 and a post 17. A PIN diode 18 is joined between the post 17 and the internal pedestal 16. Resonance windows 11 and 12 are provided between the resonator part and a waveguide connected thereto. A projected amount x of the external pedestal 15 with respect to the cavity 34 and an insertion amount y of the post 17 into the external pedestal 15 are adjustable independently. Further, a partition 30 is provided between each of the resonance parts 10 and 20 to form a coupling hole 60, and electromagnetic fields of the adjacent resonance parts 10 and 20 are made to be an even mode coupling, and thereby, the coupling hole 60 has a low-pass characteristic. Thus, generation of unnecessary resonance mode can be suppressed and a band expansion of a cutoff characteristic can be realized.

Dependencies are inferred from the claim text.