A novel compact balanced-to-unbalanced low-temperature co-fired ceramic bandpass filter with three coupled lines

Kun-Tzu Chen, Shyh-Jong Chung

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

This paper proposes a novel compact balanced-to-unbalanced bandpass filter. Firstly, a pre-design circuit is presented, which is composed of an inductive coupled-line bandpass filter and an out-of-phase capacitive coupled-line bandpass filter. A novel compact circuit with three coupled lines configuration, derived from the pre-design circuit, is then proposed for miniaturizing the balanced-to-unbalanced bandpass filter. A 2.4-GHz multilayer ceramic chip type balanced-to-unbalanced bandpass filter with a size of 2.0 mm x 1.2 mm x 0.7 mm is developed to validate the feasibility of the proposed structure. The filter is designed by using circuit simulation, as well as full-wave electromagnetic simulation softwares, and fabricated by the use of low-temperature co-fired ceramic technology. The measured results agree quite well with the simulated. According to the measurement results, the maximum insertion loss is 1.65 dB, the maximum in-band phase imbalance is within 3 degrees, and the maximum in-band magnitude imbalance is less than 0.32 dB.
Original languageEnglish
Pages (from-to)1714-1720
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Volume56
Issue number7
DOIs
StatePublished - Jul 2008

Keywords

  • SERIAL CONFIGURATION
  • TRANSMISSION ZEROS
  • DESIGN

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