DocumentCode :
980361
Title :
Coupled Transmission Lines as Impedance Transformer
Author :
Jensen, Thomas ; Zhurbenko, Vitaliy ; Krozer, Viktor ; Meincke, Peter
Author_Institution :
Tech. Univ. of Denmark, Lyngby
Volume :
55
Issue :
12
fYear :
2007
Firstpage :
2957
Lastpage :
2965
Abstract :
A theoretical investigation of the use of a coupled line section as an impedance transformer is presented. We show how to properly select the terminations of the coupled line structures for effective matching of real and complex loads in both narrow and wide frequency ranges. The corresponding circuit configurations and the design procedures are proposed. Synthesis relations are derived and provided for efficient matching circuit construction. Design examples are given to demonstrate the flexibility and limitations of the design methods and to show their validity for practical applications. Wideband matching performance with relative bandwidth beyond 100% and return loss RL > 20 dB is demonstrated both theoretically and experimentally. Good agreement is achieved between the measured and predicted performance of the coupled line transformer section.
Keywords :
coupled transmission lines; impedance convertors; impedance matching; microstrip directional couplers; coupled transmission lines; impedance matching circuits; impedance transformer; microstrip directional couplers; Bandwidth; Circuit synthesis; Coupling circuits; Design methodology; Frequency; Impedance; Performance loss; Transmission line theory; Transmission lines; Wideband; Coupled transmission lines; directional coupler; impedance matching; impedance matrix; microstrip lines; strip lines;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2007.909617
Filename :
4384451
Link To Document :
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