NDLI: New Design Formulas for Impedance-Transforming 3-dB Marchand Baluns

Content Provider	IEEE Xplore Digital Library
Author	Hee-Ran Ahn Sangwook Nam
Copyright Year	1963
Abstract	New design formulas for impedance-transforming 3-dB Marchand baluns are proposed. They are about the even- and odd-mode impedances of the coupled transmission-line sections of the Marchand baluns and determined by coupling coefficients together with termination impedances. The particular property proposed in this paper is to choose the coupling coefficient arbitrarily, resulting in infinite sets of design formulas available. This is quite different from the conventional design approach in which only one coupling coefficient is possible. For the perfect isolation of the Marchand balun, an isolation circuit (IC) is needed, being composed of two 90° transmission-line sections and resistance(s). Sufficient area to build such a long IC is, however, inherently not available. For this, ways to reduce the IC size are also suggested. To validate them, a microstrip Marchand balun terminated in 130 and 70 Ω is designed at a design center frequency of 1.5 GHz and tested. The measured results are in good agreement with prediction, showing that power divisions are 3.57 and 3.262 dB, return losses at all ports are better than 21 dB, and the isolation is better than 20 dB around the design center frequency. The measured phase difference between two balanced signals is 180°±2° in about 50% bandwidth.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	2816
Ending Page	2823
Page Count	8
File Size	876344
File Format	PDF
ISSN	00189480
Volume Number	59
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-11-01
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 matching Transmission lines Equivalent circuits Impedance new design formulas for Marchand baluns Compact isolation circuits (ICs) of Marchand baluns impedance-transforming 3-dB Marchand baluns modified $\Pi$ - and $T$ -types of equivalent circuits of transmission-line sections
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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