標題: Microstrip parallel-coupled filters with cascade trisection and quadruplet responses
作者: Lu, Jhe-Ching
Liao, Ching-Ku
Chang, Chi-Yang
電信工程研究所
Institute of Communications Engineering
關鍵字: cascade quadruplet (CQ);cascade trisection (CT);cross coupling;mixed cascaded quadruplet and trisection;parallel-coupled filter;transmission zero
公開日期: 1-Sep-2008
摘要: Microstrip parallel-coupled filters with generalized Chebyshev responses are presented. The basic structure of the proposed filter is a conventional parallel-coupled filter of which the physical dimensions can be easily obtained by the well-known analytical method. With the aid of the equivalent circuit corresponding to a conventional parallel-coupled filter, the relative insertion phase from source or load to each open end of resonators can be easily obtained by observing the two-port admittance matrix. Applying the cross coupling from source or load to a proper nonadjacent resonator, a trisection or a quadruplet coupling scheme can be realized with prescribed transmission zeros. More importantly, the proposed trisection can be designed to have a transmission zero on the lower or upper stopband by just adjusting the length of the cross-coupling strip. Using the proposed structure, the conventional time-consuming adjusting procedure to obtain initial physical dimensions of filters is no longer required. In this paper, a fourth-order parallel-coupled filter is used as the basic structure to demonstrate various combinations of transmission zeros. Simulated and measured results are well matched.
URI: http://dx.doi.org/10.1109/TMTT.2008.2002226
http://hdl.handle.net/11536/8387
ISSN: 0018-9480
DOI: 10.1109/TMTT.2008.2002226
期刊: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume: 56
Issue: 9
起始頁: 2101
結束頁: 2110
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