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2011-08-04

LTCC Fold-Back Bandpass Filter Designed with Capacitively Loaded Stubs

By Kuo-Sheng Chin, Jian-Luen Hung, Chun-Wei Huang, Shu-Peng Huang, Yung-An Kao, and Shuh-Han Chao
Progress In Electromagnetics Research C, Vol. 23, 95-109, 2011
doi:10.2528/PIERC11062704

Abstract

This study presents a design of a compact stub-type bandpass filter with capacitively loaded stubs and a fold-back structure. This paper employed the fabrication process of low-temperature co-fired ceramic (LTCC) for filter realization of a multi-layer structure. The proposed filter structure required adding end capacitors to stubs to extend their electrical length, while achieving a length reduction of 30%. This study provided design curves to determine the dimensions of the end capacitor for reaching maximum electrical length extension. In addition, a fold-back configuration was applied to halve the filter size. An experimental filter operating at 5.8 GHz was fabricated and measured to validate the design concept, achieving a highly compact size of 14.3×8.2×0.76 mm3.

Citation


Kuo-Sheng Chin, Jian-Luen Hung, Chun-Wei Huang, Shu-Peng Huang, Yung-An Kao, and Shuh-Han Chao, "LTCC Fold-Back Bandpass Filter Designed with Capacitively Loaded Stubs," Progress In Electromagnetics Research C, Vol. 23, 95-109, 2011.
doi:10.2528/PIERC11062704
http://jpier.org/PIERC/pier.php?paper=11062704

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