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 |