Abstract
Directional couplers with wideband coupling characteristics can be constructed by using a nonuniform transmission line represented by a lumped Brune section and a uniform transmission line whose characteristic impedance distribution has zero derivatives at the input and output ends (NTL-BSZD). This paper first derives the equivalent circuits of two kinds of NTL-BSZI. Next, a realization technique for a coupled NTL-BSZD (CNTL-BSZD) directional coupler and the results of characteristic analysis are presented. Then, a design method for the CNTL-BSZD directional coupler is described. Finally, experimental results are presented. © 1997 Scripta Technica, Inc. Electron Comm Jpn Pt 3, 80(4): 71–82, 1997
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