volume | PIER Journals

Abstract

This paper proposes a cross-coupled filter that utilizes a coplanar waveguide (CPW) resonator and triangular substrate-integrated waveguide (TSIW) resonant cavities. The filter consists of a CPW resonator etched on the upper metal surface of a second-order triangular SIW resonant cavity. By adjusting the dimensions of the CPW resonator and optimizing the width of the inductive coupling window, precise control can be achieved over cross-coupling between resonators, enabling fine-tuning of both filter bandwidth and transmission zero placement. Simulation and test results indicate that the filter has a center frequency of 11.85 GHz, a -3 dB bandwidth of 1.82 GHz, a relative bandwidth of 15.4%, an insertion loss of -0.9 dB in the passband, a return loss of over 15 dB, and a transmission zero point located at 15 GHz. The filter has a simple structure, wide bandwidth, low insertion loss, small circuit size, and a flexible and controllable transmission zero point, making it potentially valuable for various applications.

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Prof. Xiaohei Yan

Mr. Minjie Guo