Design of the Miniaturization of Bandpass Filter Based on Substrate Integrated Waveguide

The realization of minimized filter with different shapes of slots on the surface of square substrate integrated waveguide filter (SIWF) is proposed in this paper. Firstly, the principle of square SIWF and the design of a dual passband square SIWF with a passband of 9.30 GHz to 9.82 GHz and 15.26 GHz to 16.58 GHz are introduced. The simulations of four SIW filters with different slots are presented in this paper. The comparison among four filters verifies the miniaturization of the proposed bandpass filter based on SIW.