IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
Wideband balun using a transmission line transformer
Unghee Park
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JOURNALS FREE ACCESS

2011 Volume 8 Issue 10 Pages 730-735

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Abstract

A wideband balun consisting of a transmission line transformer (TLT) and matching and phase conversion circuits is proposed and fabricated. A TLT using three 37.5-Ω coaxial cables converts the impedance from 50 to 25Ω, and a matching circuit using four resistors from a singly terminated filter improves the matching and isolation characteristics over a four-octave range. A phase conversion circuit is implemented by cross-connecting two coaxial cables. The fabricated balun provides matching (S11, S22) and isolation (S23) characteristics of about -15dB, an output magnitude difference within 0.3dB, and an output phase difference within 180°±1.4° from 62 to 960MHz.

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© 2011 by The Institute of Electronics, Information and Communication Engineers
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