Broadband Impedance Transformer Based on Asymmetric Coupled Transmission Lines in Nonhomogeneous Medium

Vitaliy Zhurbenko, Viktor Krozer, Peter Meincke

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A new broadband quarter-wavelength impedance transformer based on an asymmetric coupled line section is presented. The bandwidth of the coupled line transformer is extended with the help of an interconnecting transmission line. An analytical model for the transformer is developed. The analysis of the structure reveals that a fractional bandwidth of more than 100% at –20 dB reflection level can be achieved with such a structure. An experimental transformer circuit has been designed, fabricated and tested. Theoretical and experimental results are fair agreement and confirm the established theory. The achieved bandwidth is almost 3 times larger as compared with standard matching circuits.
Original languageEnglish
Title of host publicationInternational Microwave Symposium Digest
Number of pages4
Place of PublicationUSA
Publication date2007
ISBN (Print)1-4244-0688-9
Publication statusPublished - 2007
EventIEEE MTT-S International Microwave Symposium - Honolulu, HI, United States
Duration: 3 Jun 20078 Jun 2007


ConferenceIEEE MTT-S International Microwave Symposium
Country/TerritoryUnited States
CityHonolulu, HI
Internet address

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