LTCC bandpass filter with wide stopband based on electric and magnetic coupling cancellation

Xin Dai*, Xiu Yin Zhang, Hsuan Ling Kao, Bai Hong Wei, Jin Xu Xu, Xiaohuan Li

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

30 Scopus citations

Abstract

This paper presents a new method of using electric and magnetic coupling cancellation to extend the stopband of bandpass filters (BPFs). The mechanism is theoretically analyzed based on the lumped-element equivalent circuit. Due to the cancellation of electric and magnetic coupling between two resonators, three transmission zeros (TZs) can be generated and controlled by manipulating the coupling strength. Using the proposed method together with source-load coupling, a low temperature cofire ceramic (LTCC) BPF is designed with four TZs at the passband edges and within the stopband, resulting in high skirt selectivity and harmonic suppression. Due to the LTCC multilayer structure, the filter size is 0.054 λg∗ 0.045 λg0.013λg, or (2.48 mm × 2.02 mm × 0.6) mm. The theoretical, simulated and measured results of the LTCC BPF are presented to validate the proposed design.

Original languageEnglish
Article number6882782
Pages (from-to)1705-1713
Number of pages9
JournalIEEE Transactions on Components, Packaging and Manufacturing Technology
Volume4
Issue number10
DOIs
StatePublished - 01 10 2014

Bibliographical note

Publisher Copyright:
© 2011-2012 IEEE.

Keywords

  • Bandpass filter (BPF)
  • electric and magnetic (EM) coupling cancellation
  • low temperature cofired ceramic (LTCC)
  • transmission zero (TZ)
  • wide stopband

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