@article{oai:kitami-it.repo.nii.ac.jp:00006396,
 author = {柴田, 孝次 and 品田, 雄治},
 issue = {2},
 journal = {北見工業大学研究報告},
 month = {Jun},
 note = {application/pdf, 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},
 pages = {335--349},
 title = {(2,2) ポート･ハイブリッド回路を構成単位とする(4,4)ポート・ハイブリッド回路(その1) : 単純ループ･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},
 volume = {7},
 year = {1976}
}