%0 Journal Article
%T Ltcc Fold-Back Bandpass Filter Designed with Capacitively Loaded Stubs
%A Kuo-Sheng Chin
%A Jian-Luen Hung
%A Chun-Wei Huang
%A Shu-Peng Huang
%A Yung-An Kao
%A Shuh-Han Chao
%J PIER    C
%D 2011
%I EMW Publishing
%R 10.2528/PIERC11062704
%X 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 14.3กม8.2กม0.76 mm.
%U http://www.jpier.org/pierc/pier.php?paper=11062704