WAVEGUIDE BANDPASS FILTER

PROBLEM TO BE SOLVED: To provide a waveguide bandpass filter continuously and easily adjusting a susceptance of a resonance region. SOLUTION: The waveguide bandpass filter has a waveguide body 10 in which the resonance region is formed, and an adjustment mechanism for adjusting the susceptance of the resonance region. The adjustment mechanism includes conducting bars 14 with a non-circular cross-section which are mounted on the waveguide body 10 so that their shaft parts rotate perpendicularly to a passing direction of an electromagnetic wave and around the shaft parts inside the waveguide body 10. An interval of the adjacent conducting bars 14 is changed by rotating the respective conducting bars 14, and thus, a resonance frequency of the resonance region is changed. The susceptance of the resonance region is adjusted thereby. COPYRIGHT: (C)2009,JPO&INPIT