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A half-mode substrate integrated waveguide (HMSIW) bandpass filter loaded with modified complementary split-ring resonators (CSRRs) is presented. The modified CSRR, realised by utilising horizontal–asymmetrical stepped-impedance (SI) structure in the conventional CSRR, can enhance the equivalent capacitance and inductance of the CSRR and consequently shift the resonant frequency downwards. Therefore,...
A quasi-elliptic function bandpass filter (BPF) based on parallel feed topology is presented. The parallel feed topology is realised by splitting the input/output port of the filter into two paths through a T-junction to excite a pair of resonators simultaneously. This configuration contributes to further improving the selectivity of the filter by introducing more transmission zeros (TZs) near the...
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