Improved compact broadband bandpass filter using branch stubs co-via structure with wide stopband characteristic

W. J. Lin, C. S. Chang, J. Y. Li, D. B. Lin, L. S. Chen, M. P. Houng

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In this paper, a broadband bandpass filter (BPF) with superior spurious suppression over a wide frequency range at least up to 20 GHz at −20 dB has been designed. The proposed broadband bandpass filter has designed using quarter-wavelength short stubs alternating with branch stubs co-via structure, andinserting the bandstop filters to substitute for redundant connecting lines. Compare with some traditional co-via structure, this work by using the branch stubs to construct the co-via structure, not only reduce the size around 70% but also decrease the radiation loss due to some complex meander configurations occurring in the connecting lines. For the prototype broadband filter, center frequencies around 4 GHz were selected. The bandwidth of passband was between 1.95 GHz and 6.25 GHz, in which the insertion-loss amounts to around −1.5 dB. The suppression range of stopbandis between 8.2–20.3 GHz, in which the insertion-loss amounts to around −20 dB.

Original languageEnglish
Pages (from-to)45-55
Number of pages11
JournalProgress In Electromagnetics Research C
Volume5
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials

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