Coupled Transmission Lines as Impedance Transformer

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 circu...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2007-12, Vol.55 (12), p.2957-2965
Main Authors: Jensen, T., Zhurbenko, V., Krozer, V., Meincke, P.
Format: Article
Language:English
Subjects:
Applied sciences
Bandwidth
Circuit properties
Circuit synthesis
Circuits
Coupled transmission lines
Coupling circuits
Design methodology
directional coupler
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Flexibility
Frequency
Impedance
impedance matching
impedance matrix
Matching
microstrip lines
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Noise levels
Performance loss
Signal convertors
strip lines
Transformers
Transmission line theory
Transmission lines
Wideband
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Summary: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.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2007.909617