A novel band-reject element for pseudoelliptic bandstop filters

被引:44
作者
Rosenberg, Uwe [1 ]
Amari, Smain
机构
[1] Ericsson GmbH, Microwave Technol Ctr, D-71522 Backnang, Germany
[2] Royal Mil Coll Canada, Dept Elect & Comp Engn, Kingston, ON K7K 7B4, Canada
关键词
asymmetric filter characteristics; bandstop filters; elliptic filters; inline filters; resonator filters; synthesis; waveguide filters;
D O I
10.1109/TMTT.2007.893653
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A novel band-reject element for the design of inline waveguide pseudoelliptic band-reject filters is introduced. The element consists of an offset partial-height post in a rectangular waveguide in which the dominant TE10 mode is propagating. The location of the attenuation pole is primarily determined by the height of the post that generates it. The element allows the implementation of weak, as well as strong coupling coefficients that are encountered in asymmetric band-reject responses with broad stopbands. The coupling strength is controlled by the offset of the post with respect to the center of the main waveguide. The posts are separated by uniform sections of the main waveguide. An equivalent low-pass circuit based on the extracted pole technique is first used in a preliminary design. An improved equivalent low-pass circuit that includes a more accurate equivalent circuit of the band-reject element is then introduced. A synthesis method of the enhanced network is also presented. Filters based on the introduced element are designed, fabricated, and tested. Good agreement between measured and simulated results is achieved.
引用
收藏
页码:742 / 746
页数:5
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