Patent ID: 9184486
Filing Date: 2015-11-10
Classification: H01P

Abstract:
1. A millimeter wave band filter comprising: a transmission line that is formed by a waveguide into which electromagnetic waves with a predetermined frequency range of a millimeter wave band are incident and which propagates the corresponding incident electromagnetic waves from one end to the other end in a TE10 mode; and a pair of radio-wave half mirrors that are disposed opposite each other with a space interposed therebetween so as to block the inside of the transmission line and have planar shapes and a characteristic of transmitting a part of the electromagnetic waves with the predetermined frequency range and reflecting another part thereof, wherein in the electromagnetic waves incident from the one end of the transmission line, a frequency component centered on a resonant frequency of a resonator, which is formed between the pair of radio-wave half mirrors, is selectively output from the other end of the transmission line, and in order to change an electrical length between the pair of radio-wave half mirrors, at least one of space-varying means, which varies a space between the pair of radio-wave half mirrors, and permittivity-varying means, which varies permittivity of a dielectric material inserted between the pair of radio-wave half mirrors, is provided.