Patent ID: 8198952

Claim:
A high-frequency limiter for limiting power of a high frequency signal propagating in a waveguide at a predetermined upper limit, comprising: a resonator part to which a first waveguide into which the high frequency signal comes and a second waveguide for outputting the high frequency signal to be propagated are connected; wherein the resonator part includes at least one multi section re-entrant coaxial cavity, the multi section re-entrant coaxial cavity includes: an internal re-entrant coaxial cavity having a central conductor and a pedestal opposing to the central conductor, that are coaxially arranged; and an external re-entrant coaxial cavity having a cavity of the resonator part and the pedestal; wherein a PIN diode is connected between the central conductor and the pedestal of the internal re-entrant coaxial cavity, and the PIN diode is provided so as to adjust individually a projected amount of the central conductor toward the internal re-entrant coaxial cavity and a projected amount of the pedestal with respect to the cavity.