An extremely wideband ridge waveguide filter

TitleAn extremely wideband ridge waveguide filter
Publication TypeConference Paper
Year of Publication2004
AuthorsLiu, Z. M., J. A. Ruiz-Cruz, C. Wang, and K. A. Zaki
Conference Name2004 IEEE MTT-S International Microwave Symposium Digest
Date PublishedJune
Keywordsair filled ridge waveguide, fractional bandwidth, mode matching, mode matching method, ridge waveguides, strip lines, stripline, waveguide filters 3 to 9 GHz, wideband ridge waveguide filter
AbstractAn extremely wideband ridge waveguide filter is presented. The fractional bandwidth of the filter can be greater than 115%. An input and output transition from ridge waveguide to stripline and then to coax is also designed. The analysis is done with mode matching method and verified with Ansoft HFSS. For validation purpose, a test filter with pass band from 3 GHz to 9 GHz has been designed. The results by both mode matching method and Ansoft HFSS are presented. Excellent agreement is obtained. The test filter is designed using air filled ridge waveguide; however the same design procedure can be equally applied to other manufacturing techniques such as LTCC.