A compact microstrip wideband arbitrary branch-line coupler with coupled-line impedance-transforming structures
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Pages (from-to) | 256-270 |
Journal / Publication | Electromagnetics |
Volume | 33 |
Issue number | 3 |
Publication status | Published - 1 Apr 2013 |
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Abstract
Abstrct A novel coupled-line impedance-transforming structure with two parallel short-circuit stubs is proposed to design a wideband branch-line coupler with arbitrary power division in this article. In order to design this modified wideband branch-line coupler, analytical synthesis equations are obtained. As typical examples, four wideband branch-line couplers with different power dividing ratios are presented. The widest 20-dB return loss and isolation fractional bandwidth in these four numerical examples is almost 38%. Finally, two microstrip branch-line couplers operating at 1 GHz are fabricated and measured. One of these couplers has equal power division and a measured 13.9-dB return loss and isolation fractional bandwidth of 32.8%. The other one has 3-dB unequal power division and a measured 12.7-dB return loss and isolation fractional bandwidth of 37.6%. Obviously, this proposed branch-line coupler has several advantages, including a wide band, a compact size, an unequal power division, easy implementation (simple structure), and an analytical design method. Copyright © 2013 Taylor and Francis Group, LLC.
Research Area(s)
- branch-line coupler, coupled line, unequal power division, wide band
Citation Format(s)
A compact microstrip wideband arbitrary branch-line coupler with coupled-line impedance-transforming structures. / Wu, Yongle; Sun, Weinong; Leung, Sai-Wing; Diao, Yinliang; Chan, Kwok-Hung.
In: Electromagnetics, Vol. 33, No. 3, 01.04.2013, p. 256-270.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review