A new compact LTCC bandpass filter using negative coupling

Wei Shin Tung*, Yi Chyun Chiang, Jui Ching Cheng

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

29 Scopus citations

Abstract

This letter presents the design and realization of a new compact bandpass filter (BPF) fabricated on multilayered ceramic substrates. This BPF features coupled resonators with negative coupling coefficients. A BPF with center frequency 2.45 GHz is designed and fabricated. Its size is only 2.0 mm × 1.8 mm × 0.67 mm when implemented by a standard low temperature co-fired ceramic technology. The size reduction is due to the higher coupling coefficient between the negatively-coupled resonators than the positively-coupled ones, allowing tighter space between the resonators. The measured insertion losses of the previous BPF were less than 3 dB and return losses more than 18 dB in the passband. The measured result agrees very well with the electromagnetic (EM) designed response.

Original languageEnglish
Pages (from-to)641-643
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume15
Issue number10
DOIs
StatePublished - 10 2005

Keywords

  • Bandpass filter (BPF)
  • Filters
  • Low-temperature co-fired ceramic (LTCC)
  • Lumped element microwave circuits

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