COMPACT BRANCH-LINE COUPLER WITH HARMONIC SUPPRESSION BASED ON A PLANAR SIMPLIFIED DUAL COMPOSITE RIGHT/LEFT-HANDED TRANSMISSION LINE STRUCTURE | Zendy

Cheng Wang | Zendy; Wanchun Tang | Zendy

Open Access

COMPACT BRANCH-LINE COUPLER WITH HARMONIC SUPPRESSION BASED ON A PLANAR SIMPLIFIED DUAL COMPOSITE RIGHT/LEFT-HANDED TRANSMISSION LINE STRUCTURE

Author(s) -

Cheng Wang,

Wanchun Tang

Publication year - 2018

Publication title -

progress in electromagnetics research m

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.216

H-Index - 31

ISSN - 1937-8726

DOI - 10.2528/pierm18022706

Subject(s) - transmission line , planar , dual (grammatical number) , line (geometry) , composite number , optics , physics , topology (electrical circuits) , mathematics , computer science , geometry , telecommunications , algorithm , combinatorics , art , computer graphics (images) , literature

In this paper, a planar simplified dual composite right/left-handed (SD-CRLH) transmission line (TL) structure is proposed and applied to the design of branch-line coupler. The SD-CRLH TL is obtained by a microstrip line with an open-ended stub in square spiral form. Since this structure has unusual phase shift characteristics with a transmission zero out of the passband, the branch-line coupler with the planar SD-CRLH TL can achieve both size reduction and harmonic suppression. Such a branch-line coupler operating at 0.915 GHz is investigated and fabricated. The equivalent circuit simulation, full-wave simulation and measurement results agree well with each other. From the results, it is shown that the area of the proposed branch line coupler is reduced by 74% compared to the conventional one while maintaining similar performance, and the second harmonic suppression can be lower than −45 dB.

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