Low passive intermodulation waveguide flange and design method thereof

The invention discloses a low passive intermodulation waveguide flange and a design method thereof. Through designing periodic metal convex bodies on conventional flange surfaces, a non-contact structure is formed by arranging the metal convex bodies with another flange surface at a certain distance; through designing and calculating the parameters such as the size of the metal convex bodies and the distance between flanges, appropriate electromagnetic forbidden band characteristics are obtained; therefore, the suppression of electromagnetic wave leakage in flange clearance is realized, and the waveguide flange which is not contacted internally is formed combined with the mechanical connection structure. According to the passive intermodulation waveguide flange disclosed by the invention,through constructing the non-contact electromagnetic band-gap structure, the non-contact between flanges is realized without affecting the transmission of electromagnetic waves between waveguides, thecontact nonlinearity is e