Low-Loss, Compact DS-OCSRR Shaped DGS Loaded HMSIW Band Pass Filter with High Fractional Bandwidth

Based on the slots and Defected Ground Structure (DGS) technology, Half Mode SIW filter is developed with wide bandwidth. The high pass HMSIW is transformed to band pass filter by means of embedding slots on the microstrip line. To improve the return loss profile of the filter, Double Slit Octagonal Complementary Split Ring Resonator shaped DGS is utilized. The working version is made on a 1.6 mm-thick RT Duroid 5880 board. The simulation outputs and measured results are mutually consistent. The filter is centered at 6.82 GHz. It possesses wide passband from 4.76 GHz to 8.87 GHz with a fractional bandwidth of 60.26 %. It is of size 0.86 lg x 0.37 lg, where lg is calculated at 6.82 GHz. Applications involving C band satellite communication can benefit from the specified low-loss wideband filter.