Wideband bandpass microstrip filters with triple coupled lines and open/short stubs

Hussein N. Shaman, Jia Sheng Hong

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Citations (Scopus)

Abstract

Compact planar wideband bandpass filters are proposed in this paper. They are constructed of only one section of three coupled lines which is a quarter wavelength long at the midband frequency. In addition, two quarter wavelength shortcircuited stubs or one open-circuited stub are added to the central line. As a result, the filters exhibit two new symmetric transmission zeros around the passband which increase the selectivity of both edges of the passband significantly. The transmission zeros can be located at any desired frequency by adjusting the width of the additional stubs. Hence, different bandwidths can be obtained where the bandwidth is reversely proportional to the width of the short-circuited stubs and directly proportional to the width of the open-circuited stub. Four filters with fractional bandwidth of about 80% and 50% are successfully realized on microstrip lines. The filters are designed, simulated, fabricated, and measured where excellent agreement is obtained.

Original languageEnglish
Title of host publication2007 Asia-Pacific Microwave Conference, APMC
DOIs
Publication statusPublished - 2007
EventAsia-Pacific Microwave Conference - Bangkok, Thailand
Duration: 11 Dec 200714 Dec 2007

Conference

ConferenceAsia-Pacific Microwave Conference
Abbreviated titleAPMC 2007
CountryThailand
CityBangkok
Period11/12/0714/12/07

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