Novel balanced bandpass filters using substrate integrated half-mode waveguide

Min Hua Ho, Cheng Siou Li

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


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.

Original languageEnglish
Article number6415314
Pages (from-to)78-80
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number2
Publication statusPublished - 2013 Jan 22

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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