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Novel HMSIW cavity based bandpass filter for X band application

In this paper, novel planar miniaturized bandpass filters using half-mode Substrate Integrated Waveguide (HMSIW) technology based rhombic resonators are presented. The proposed designs use two half mode rhombic resonator connected by the coupling window in the common sidewall to implement miniaturized planar filters. Design-I is a two pole bandpass filter implemented using fundamental mode of the rhombic resonator which has been designed for X-band application. The design center frequency is at 9.94 GHz with fractional bandwidth 9.05%. Design-II is a four pole bandpass filter which is operating at X-band. This filter is designed using two higher order orthogonal modes of the rhombic half mode resonator. The design center frequency of the filter is at 9.92 GHz with fractional bandwidth 8.37%. The selectivity of the Design-II bandpass filter is improved as compared to that of Design-I by introducing cross-coupling between higher order orthogonal modes. Both the filters are fabricated in a single substrate and good agreement between simulated and measured result is observed.