標題: New synthesis of parallel-coupled line bandpass filters with Chebyshev responses
作者: Chin, Kuo-Sheng
Chiou, Yi-Chyun
Kuo, Jen-Tsai
電信工程研究所
Institute of Communications Engineering
關鍵字: bandpass filters;Chebyshev response;insertion-loss function;parallel-coupled line filter;strong coupling
公開日期: 1-七月-2008
摘要: Parallel-coupled line filters with Chebysbev passbands are synthesized based on the insertion-loss functions derived by converting the composite ABCD matrices of all coupled stages. With the synthesis, both the electromagnetic simulation and measurement results have accurate in-band response and bandwidth. Simultaneous equations for Chebyshev filters of order N <= 9 are derived for determining geometric parameters of the coupled stages. The tradeoff between circuit bandwidth and ripple level is discussed. In experiments, three planar or quasi-planar structures, including the coupled-line with aperture in the ground plane, the three-line microstrip, and the broadside-coupled lines, are employed to realize the end stages for implementing the high coupling levels. Experimental filters of order up to nine with fractional bandwidth of 30% or 40% are fabricated and measured. The results show good agreement with predictions by the theory and simulation.
URI: http://dx.doi.org/10.1109/TMTT.2008.925572
http://hdl.handle.net/11536/8603
ISSN: 0018-9480
DOI: 10.1109/TMTT.2008.925572
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 56
Issue: 7
起始頁: 1516
結束頁: 1523
顯示於類別:期刊論文


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