volume | PIER Journals

Abstract

This paper presents a compact substrate-integrated waveguide (SIW) bandpass filter featuring a simple structure and transmission zeros. The proposed filter utilizes a quarter-wavelength transmission line in conjunction with a short-circuited and open-circuited via structure to achieve a third-order bandpass filter response. The filter achieves a passband from 14.15 GHz to 15.86 GHz with a return loss (|S₁₁|) better than -10 dB, indicating good impedance matching. To enhance out-of-band rejection, single- and double-slot structures are introduced along the quarter-wavelength transmission line of the SIW filter without increasing the overall circuit area. The SIW filter using the single-slot structure generates a transmission zero at 16.5 GHz, albeit with limited suppression. In contrast, the SIW filter using the double-slot structure introduces a deeper transmission zero at the same frequency, substantially improving stopband attenuation while maintaining excellent passband performance. The proposed filter offers high selectivity, compact size, and structural simplicity, making it a strong candidate for high-frequency communication and radar system applications. To validate the design, prototypes of the SIW bandpass filter, including the prototype version, single-slot version, and double-slot version, were fabricated and measured. The measurement results show good agreement with the simulation results.

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Dr. Qun-Lin Chen

Prof. Chun-Long Wang