CSRR-DGS bandpass filter based on half mode substrate integrated waveguide for X-band applications

Abstract

In this research, a novel half mode substrate integrated waveguide (HMSIW) bandpass filter based on defected ground structure cells (DGS) is proposed. By using the periodic square Complementary Split Ring Resonator (CSRR) resonant properties of DGS according to design requirement, an X-band bandpass filter is designed and analyzed to meet compact size, low insertion loss, and high rejection. The simulation results obtained by CST and HFSS simulators in X-band show that the proposed filter is characterized by a large transmitted bandwidth of about 1.6 GHz from 13.2 to 14.8 GHz. The higher simulated insertion loss is about −2.6 dB and the lower return loss is about −39 dB. The proposed filter size is 9.5 × 38.0 mm2 which make it a compact component. The filter design is optimized using CST and to validate the proposed filter the simulation results is compared by HFSS. The HFSS simulation results are in decent promise with the CST results.