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A compact planar wide‐band balun with high isolation based on coupled‐line and composite right–left‐handed transmission line
Author(s) -
Wu Yongle,
Zhuang Zheng,
Jiao Lingxiao,
Liu Yuanan
Publication year - 2016
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.29567
Subject(s) - balun , transmission line , microstrip , planar , power dividers and directional couplers , return loss , broadband , electric power transmission , insertion loss , microwave , electrical engineering , engineering , line (geometry) , electronic engineering , phase (matter) , optoelectronics , materials science , telecommunications , computer science , physics , antenna (radio) , mathematics , computer graphics (images) , geometry , quantum mechanics
A novel compact single‐layer wide‐band planar balun with high isolation is proposed. It is composed of a broadband coupled‐line power divider and an improved phase shifter using coupled‐line (CL) and composite right/left‐handed transmission line (CRLH TL). The CRLH structure is used to realize the advanced phase response while the coupled‐line power divider can be utilized to provide the performance of wide‐band matching and isolation. For demonstration, a novel planar microstrip balun operating at ∼2.75 GHz is designed and implemented. The proposed balun has many advantages including compact single‐layer structure, excellent return loss, high isolation, and perfect phase response. Finally, good agreements between the simulated and measured results verify this design. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:372–376, 2016