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Novel Balanced Bandpass Filters Using Substrate Integrated Half-Mode Waveguide

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2 Author(s)
Min-Hua Ho ; Dept. of Electron. Eng., Nat. Changhua Univ. of Educ., Changhua, Taiwan ; Cheng-Siou Li

The contribution of this work is to propose novel balanced bandpass filters (BPFs) using the half-mode substrate integrated waveguide (HMSIW) and its size-reduced form, a folded HMSIW structure. The size of an HMSIW is about half of the substrate integrated waveguide (SIW) and the size of the folded HMSIW further reduces to 25%. Besides compactness, the proposed BPFs are attractive because the thru-via array needed for providing the side-wall effect is no longer required. In addition, the common-mode (CM) rejection of the HMSIW BPF is achieved from the non-coupling slots, caused by the PMC. The CM rejection of the folded HMSIW BPF is obtained by up-shifting the CM operating frequency far away from the differential-mode (DM) passband. Prototypes of the proposed circuits are fabricated and measured to present CM rejection levels larger than 40 dB over a wide frequency range and DM insertion losses around 2 dB in the passbands. Agreements between measured and simulated data are observed to validate the circuit design and performance.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:23 ,  Issue: 2 )