Microwave circuits based on six-port junction

This paper describes the procedure of microwave circuits construction based on double-Y junction, which is actually a six-port circuit. The procedure is based on S-matrix of lossless double-Y junction. It has been demonstrated how a double-Y junction can be modified into a double-Y balun and a 3 dB quadrature coupler by placing open and short circuits on appropriate ports of a double-Y junction.