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Open AccessArticle

A 0.8–8 GHz Multi-Section Coupled Line Balun

EECS Department, The University of Toledo, 2801 W Bancroft St., Toledo, OH 43606, USA
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Geok Ing Ng
Electronics 2015, 4(2), 274-282;
Received: 19 March 2015 / Revised: 18 April 2015 / Accepted: 24 April 2015 / Published: 30 April 2015
(This article belongs to the Special Issue Microwave/ Millimeter-Wave Devices and MMICs)
In this work, we propose a wideband multi-section transforming coupled-line balun using near equal length transmission line elements. The resulting design is realized by cascading several coupled-lines with minimal discontinuities. The multi-section Chebyshev matching optimizes bandwidth at the expense of passband ripple. The proposed design delivers good impedance matching and consistent 180° phase shift over 0.8–8 GHz frequency spectrum. Furthermore, the need for vias in conventional balun designs is relaxed by replacing the short-circuited (SC) terminal by its equivalent dual open-circuited (OC) element. The proposed design is simulated, fabricated, and measured. Both simulated and measured results are in a good agreement, and show an input port matching of below −9.7 dB over the design bandwidth, with a maximum phase and amplitude imbalance of 2.1° and 0.9 dB, respectively. View Full-Text
Keywords: balun; Chebyshev; coupled-line; multi-section; stepped impedance; wideband balun; Chebyshev; coupled-line; multi-section; stepped impedance; wideband
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MDPI and ACS Style

Itapu, S.; Almalkawi, M.; Devabhaktuni, V. A 0.8–8 GHz Multi-Section Coupled Line Balun. Electronics 2015, 4, 274-282.

AMA Style

Itapu S, Almalkawi M, Devabhaktuni V. A 0.8–8 GHz Multi-Section Coupled Line Balun. Electronics. 2015; 4(2):274-282.

Chicago/Turabian Style

Itapu, Srikanth; Almalkawi, Mohammad; Devabhaktuni, Vijay. 2015. "A 0.8–8 GHz Multi-Section Coupled Line Balun" Electronics 4, no. 2: 274-282.

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