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Theory and design of wideband 3‐dB suspended microstrip couplers with floating conductor
Author(s) -
Karam Michel,
Demers Yves,
Xu Yansheng,
Bosisio Renato G.
Publication year - 1990
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.4650030514
Subject(s) - microstrip , directivity , wideband , conductor , microwave , electronic engineering , rat race coupler , power dividers and directional couplers , hybrid coupler , engineering , electrical engineering , acoustics , physics , materials science , telecommunications , antenna (radio) , composite material
Using the spectral domain method, theoretical analysis of the characteristics of coupled suspended microstrip lines with floating conductor is presented in detail. The distributions of electrical charges on the coupled microstrip lines and floating conductor are studied, and a set of basis functions used in the calculation is obtained. Detailed numerical results and design curves are presented, and an experimental wideband 2.5‐dB coupler is designed and measured. The test results are in agreement with theoretical values. This type of coupler is simple in construction and capable of realizing tight coupling (3 dB or higher) in microwave integrated circuits (MIC) with high directivity.