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The design of single‐section and wideband symmetrical three‐line microstrip couplers
Author(s) -
Coetzee J. C.,
Nieuwoudt M. M.
Publication year - 1996
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/(sici)1098-2760(19961020)13:3<165::aid-mop14>3.0.co;2-7
Subject(s) - microstrip , wideband , power dividers and directional couplers , conductor , hybrid coupler , strips , ground plane , scattering parameters , electronic engineering , rat race coupler , stripline , engineering , transmission line , topology (electrical circuits) , line (geometry) , optics , electrical engineering , physics , computer science , geometry , mathematics , antenna (radio) , algorithm
The three‐line microstrip coupler consists of three parallel strips on a dielectric substrate above a ground plane. The six‐port network combines a specified fraction of two independent input signals on a common conductor without interaction of the signal sources. The results of a quasi‐TEM analysis of the three‐line coupler are used to accurately predict the scattering parameters of a structure of arbitrary linewidths and section length. A search for suitable dimensions of couplers that meet certain design criteria is performed, with the use of a modeling technique that relates the six‐port network to two simple circuits. The results are set design curves, which are used to design both a single‐section coupler and a wideband stepped coupler. The theory is validated through comparison with experimental data for the manufactured prototypes. © 1996 John Wiley & Sons, Inc.