volume | PIER Journals

Abstract

This paper presents a wide-passband, miniaturized filter based on quarter-mode substrate-integrated waveguide (QMSIW) resonant cavities and microstrip resonators. The filter employs two QMSIW resonant cavities, which effectively reduce its size. Moreover, the higher-order modes TE₁₂₀, TE₂₁₀, and TE₂₂₀ cannot propagate within these cavities. The addition of two microstrip resonators at the coupling iris between the QMSIW cavities enables a fourth-order filter response using only two resonant cavities. High selectivity is achieved through cross-coupling, which introduces two transmission zeros (TZs). The filter was fabricated and measured, showing good agreement with the simulation results. Compared with other substrate-integrated waveguide (SIW) filters, the proposed filter offers advantages in compactness, passband bandwidth, and higher-order mode suppression.

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Dr. Jingyv Wang

Dr. Haiyan Zeng

Dr. Mengling Su

Dr. Xuan'an Chen

Dr. Lishan Huang

Dr. Jinming Ou

Prof. Xiaohei Yan