Patent ID: 9537195
Date: 2017-01-03
CPC Classifications: H01P

Claim:
1. A band-pass filter, comprising: a body; a rectangular waveguide defined in the body, the waveguide having long side walls and short side walls defining an a×b cross-section, wherein a is a length of the long side walls of the waveguide, b is a length of the short side walls of the waveguide, and each long side wall is provided at a central portion thereof with a fixing groove; and a dielectric insert having two ends, the two ends of the dielectric insert being placed in the fixing grooves respectively, and the dielectric insert being symmetric with a perpendicular bisecting plane of the long side walls, and further comprising a dielectric plate and a high temperature superconductive film, the high temperature superconductive film comprising a plurality of rectangular windows of a same height, wherein each long side wall is provided with a rectangular recess, and the corresponding fixing groove is formed in each of the rectangular recesses of the long side walls; each of the rectangular recesses is symmetric with the perpendicular bisecting plane of the long side walls and each rectangular recess has a same length as the length of the waveguide; and a width w of each of the rectangular recesses is less than the length a of each long side wall and greater than a total thickness t of the dielectric plate and the high temperature superconductive film, and a depth d of each of the rectangular recesses satisfies d<λ/4, λ is a wavelength corresponding to a central frequency of a pass-band of the band-pass filter.