Realization of transmission zeros in combline filters using an auxiliary inductively coupled ground plane

Ching Wen Tang*, Yin Ching Lin, Chi-Yang Chang

*Corresponding author for this work

Research output: Contribution to journalArticle

65 Scopus citations

Abstract

The out-band transmission zeros of the multilayer low-temperature co-fired ceramic bandpass filter are studied in this paper. The design target of this filter, with the passband between 2.3-2.65 GHz (the true application is 2.4-2.483 GHz), is to reject the local oscillator and image signals and, in the mean time, to suppress the harmonic frequency. This filter is a modified three-pole combline filter, which can easily achieve a high rejection rate and low insertion loss. The source-load coupling capacitor incorporation with cross-coupling grounding inductors can generate three transmission zeros. By properly adjusting the inductance values of the inductors between three resonators and ground can easily manipulate the transmission zero at a high-side skirt to suppress the harmonic frequency. The measured results match well with the electromagnetic simulation that evidences the feasibility of the proposed design.

Original languageEnglish
Pages (from-to)2112-2118
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Volume51
Issue number10
DOIs
StatePublished - 1 Oct 2003

Keywords

  • Chip-type component
  • Filter
  • Low-temperature co-fired ceramic (LTCC)
  • Multilayer ceramic (MLC)

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