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LTCC FOLD-BACK BANDPASS FILTER DESIGNED WITH CAPACITIVELY LOADED STUBS

By K.-S. Chin, J.-L. Hung, C.-W. Huang, S.-P. Huang, Y.-A. Kao, and S.-H. Chao

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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:
K.-S. Chin, J.-L. Hung, C.-W. Huang, S.-P. Huang, Y.-A. Kao, and S.-H. 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

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