LTCC wideband filter design with selectivity enhancement

Kengyi Huang, Tsenchieh Chiu

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


A new design scheme for the wideband filters with the low temperature co-fired ceramic (LTCC) technology is proposed in this letter. Based on the traditional second-order combline filter, an extra shunt capacitor is added in the middle of the coupled line, and a new transmission zero is thus obtained. The proposed design not only possesses excellent selectivity at both sides of the passband, the fractional bandwidth can also be as wide as 86%. To validate the design scheme, the proposed technique is applied to the third-order combline filter and realized by using the LTCC technology. The wide-band filter with passband of 3.15.1 GHz is obtained. With four transmission-zeros, the selectivity and out-band rejection of the third-order filter is further improved from those of the second-order designs.

Original languageEnglish
Article number5109494
Pages (from-to)452-454
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number7
StatePublished - Jul 2009


  • Coupled line
  • Filter
  • Low-temperature co-fired ceramic (LTCC)


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