On the Plurality of Solutions in Synthesizing Asymmetric Multi-Element Coupled-Transmission-Line Directional Couplers

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It is the purpose of this paper to point out the general plurality of solutions in synthesizing asymmetric multi-element coupled-transmission-line directional coupler. In this synthesis　method，the coupling coefficient of each element is determined on the basis of the analysis of F matrix by using the power division ratio between the two output ports. Applying this synthesis procedure to the asymmetric multi element coupled-transmission-line directional coupler(n≧4)，we have found the solution satisfying the given transmission characteristic has plurality，and the coupling coefficients calculated by this synthesis are tabulated for 3,4,5 and 6 elements coupler.
北見工業大学の論文