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CLC number: O441

On-line Access: 2011-09-09

Received: 2010-09-30

Revision Accepted: 2011-01-13

Crosschecked: 2011-07-29

Cited: 5

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Journal of Zhejiang University SCIENCE C 2011 Vol.12 No.9 P.766-773

http://doi.org/10.1631/jzus.C1000343


Miniaturized fractal-shaped branch-line coupler for dual-band applications based on composite right/left handed transmission lines


Author(s):  He-xiu Xu, Guang-ming Wang, Pei-lin Chen, Tian-peng Li

Affiliation(s):  Electromagnetic Field and Microwave Technique, Missile Institute, Air Force Engineering University, Sanyuan 713800, China, School of Electronics and Information Engineering, Northwestern Polytechnical University, Xi’an 710129, China

Corresponding email(s):   hxxu20008@yahoo.cn

Key Words:  Fractal, Composite right/left handed transmission line (CRLH TL), Dual-band (DB), Miniaturization, Branch-line coupler (BLC)


He-xiu Xu, Guang-ming Wang, Pei-lin Chen, Tian-peng Li. Miniaturized fractal-shaped branch-line coupler for dual-band applications based on composite right/left handed transmission lines[J]. Journal of Zhejiang University Science C, 2011, 12(9): 766-773.

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author="He-xiu Xu, Guang-ming Wang, Pei-lin Chen, Tian-peng Li",
journal="Journal of Zhejiang University Science C",
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number="9",
pages="766-773",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.C1000343"
}

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%T Miniaturized fractal-shaped branch-line coupler for dual-band applications based on composite right/left handed transmission lines
%A He-xiu Xu
%A Guang-ming Wang
%A Pei-lin Chen
%A Tian-peng Li
%J Journal of Zhejiang University SCIENCE C
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%@ 1869-1951
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.C1000343

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T1 - Miniaturized fractal-shaped branch-line coupler for dual-band applications based on composite right/left handed transmission lines
A1 - He-xiu Xu
A1 - Guang-ming Wang
A1 - Pei-lin Chen
A1 - Tian-peng Li
J0 - Journal of Zhejiang University Science C
VL - 12
IS - 9
SP - 766
EP - 773
%@ 1869-1951
Y1 - 2011
PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.C1000343


Abstract: 
In this paper, novel dual-band (DB) branch-line couplers (BLCs) employing a composite right/left handed transmission line (CRLH TL) and fractal geometry are presented for the first time. The CRLH TL, with specified characteristic impedance and phase shift, consists of lumped elements for the left handed (LH) part and fractal-shaped microstrip lines (MLs) for the right handed (RH) part, which can be designed separately. Two designed BLCs are involved in size reduction, one using a 3/2 fractal curve of first iteration, the other constructed based on a hybrid shape of fractal and meandered lines. A miniaturized principle for CRLH TL realization is derived and an exact design method for fractal implementation is developed. For verification, an example coupler was fabricated and measured. Consistent numerical and experimental results confirmed the design concept, showing that the BLCs obtain DB behavior centered at 0.9 GHz and 1.8 GHz respectively with good in-band performance, except for slightly larger coupled insertion loss for the hybrid-shaped BLC case. In addition, the proposed fractal- and hybrid-shaped BLCs obtained a 49.7% and 64.1% size reduction respectively relative to their conventional counterparts working in the lower band. The most important contributions of this article are the demonstration of compatibility between the fractal and CRLH TL techniques and the provision of an alternative approach and a new concept for designing devices.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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