(2,2)ポ-ト・ハイブリッド回路を構成単位とする(4,4)ポ-ト・ハイブリッド回路-1-単純ル-プ・ハイブリッド回路および2線条方向性結合器によるもの

概要

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Although some ways to realize (4,4)-port hybrid circuits have already been shown，another simple method is proposed in this paper. That is to use four (2,2)-port hybrid circuits and connect them so that each input power from four input ports is equally delivered to four output ports. Provided that the hybrid operations of each (2,2)-port hybrid circuit are perfect at the center frequency f_0 of transmission, those of the (4,4)-port circuit are also perfect at f_0 and the same compensations for hybrid characteristics as (2,2)- port hybrid circuits can be used for the (4,4)-port hybrid circuits. Simple loop hybrid rings and coupled transmission-line directional couplers are employed to compose the (4,4)-port hybrid circuits，for they have　symmetric transmission and equal operating characteristics at all four ports. Hybrid characteristics of these circuits are calculated theoretically and represented by figures