NDLI: Complex Impedance Transformers Consisting of Only Transmission-Line Sections

Content Provider	IEEE Xplore Digital Library
Author	Hee-Ran Ahn
Copyright Year	1963
Abstract	Design methods are, for the first time, suggested for the complex impedance transformers, to solve the conventional problem of imaginary value of characteristic impedance of transmission-line sections. The complex impedance transformers consist of only transmission-line sections, and the design formulas are the function of the reίection coefficients of the complex termination impedances. Firstly, the impedance transformers that transform a complex impedance into a real one are discussed. Secondly, those transforming a complex impedance to another complex one are studied. For the impedance transformers of the first type, the regions of the Smith chart where one complex impedance can be transformed into one real one by only one transmission-line section are called allowed regions, while the outside forbidden regions. Depending on where the complex impedances are located, a method to reduce the size is discussed in more detail. For the second case where both termination impedances are complex, the complex conjugate of one of two complex impedances should be located on a Smith chart for maximum power transfer. The design formulas are then obtained in a similar manner. To validate the design formulas, three impedance transformers terminated in a fixed complex impedance of (1000 - j30) Ω and three real impedances of 50, 60, and 80 Ω are fabricated and measured. The measured results show quite good agreement with prediction, return losses of 30-38 dB being achieved around the design center frequency of 2 GHz.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	2073
Ending Page	2084
Page Count	12
File Size	2579629
File Format	PDF
ISSN	00189480
Volume Number	60
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance Transmission lines Transforms Frequency measurement Loss measurement Equations Admittance transmission-line impedance transformers Allowed and forbidden regions complex impedance transformers design formulas of complex impedance transformers
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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Comments on “Complex Impedance Transformers Consisting of Only Transmission-Line Sections”

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Comments on “Complex Impedance Transformers Consisting of Only Transmission-Line Sections”

On the Design of Stepped Transmission-Line Transformers (Correspondence)

Design of 1:4 Ultrawideband Hybrid Transmission-Line Balun

Exact Design of Stepped-Impedance Transformers (Short Papers)

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