Dual‐band balun with high isolation and flexible implementation based on three‐section pi‐shaped coupled lines

A novel planar dual‐band balun with high isolation and flexible implementation is proposed in this letter. Based on the design of a single‐band branch‐line balun, the ideal all‐port matching and output isolation are fulfilled. To achieve the dual‐band operation, innovative structures consisting of t...

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Bibliographic Details
Published in:Microwave and optical technology letters 2017-07, Vol.59 (7), p.1639-1645
Main Authors: Yao, Lidan, Wu, Yongle, Liu, Yuanan
Format: Article
Language:English
Subjects:
balun
dual‐band
flexible implementations
three‐section pi‐shaped coupled lines (TSPSCL)
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Summary:A novel planar dual‐band balun with high isolation and flexible implementation is proposed in this letter. Based on the design of a single‐band branch‐line balun, the ideal all‐port matching and output isolation are fulfilled. To achieve the dual‐band operation, innovative structures consisting of three‐section Pi‐shaped coupled lines in place of conventional branch lines with arbitrary impedances and phases are exploited. Moreover, expedient implementations can be regulated according to practical requirements while maintaining identical performance. Analytical closed‐form equations are obtained by even‐odd mode method and ABCD matrix. Analyses concerning the available frequency ratio are provided as well. For verification, a prototype working at 1.74 and 4.91 GHz is designed and fabricated. Both the simulation and measurement exhibit excellent properties and agree well with each other.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.30606