Evanescent mode waveguide high-pass filter

The invention discloses an evanescent mode waveguide high-pass filter. The evanescent mode waveguide high-pass filter comprises an evanescent mode waveguide and two coupling waveguides connected withtwo ends of the evanescent mode waveguide and used as input and output ports respectively; and the at least one coupling waveguide is connected with a resonant cavity used for providing out-of-band transmission zeros, and the resonant frequency of the resonant cavity is within the band-stop range of the evanescent mode waveguide high-pass filter. Compared with the prior art, the simple resonant cavity structure is arranged on the input port and/or the output port of the evanescent mode waveguide high-pass filter, so that the transmission zero points of the high-pass filter is realized throughthe zero point effect of the resonant cavity and out-of-band rejection is increased under the conditions of not prolonging the waveguide length and satisfying the structure compactness requirement; and meanwhile, the insertion