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Novel design of multiband branch‐line coupler using multiband transmission lines
Author(s) -
Ren Han,
Shao Jin,
Zhou Mi,
Arigong Bayaner,
Ding Jun,
Zhang Hualiang
Publication year - 2014
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.28722
Subject(s) - microwave , planar , transmission line , multi band device , engineering , line (geometry) , hybrid coupler , electric power transmission , electrical engineering , electronic engineering , rat race coupler , center frequency , topology (electrical circuits) , power dividers and directional couplers , telecommunications , computer science , band pass filter , mathematics , computer graphics (images) , geometry , antenna (radio)
In this article, a novel multiband branch‐line coupler employing multiband transmission lines is designed to operate at three different frequencies. To realize multiband operations, a Pi‐type‐based multiband transmission line network with open‐ and short‐ended stubs is employed. Specifically, the Pi‐type line is applied to realize the dual‐band operation at the first two working frequencies. For the third operating frequency, the open‐ and short‐ended stubs are tapped at the center of the Pi‐type line. ABCD‐matrix is employed to derive the design formulas for the proposed triband transmission line. To verify the design concept, a planar coupler operating at 1/2.5/4.5GHz is designed and fabricated. The simulation and measurement results show good agreement with the design theory. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2841–2845, 2014