Research on the equivalent circuit model of the cross-junction

In this paper, analysis of a cross-junction based on the admittance matrix is presented. This method extracts parameters of the equivalent circuit model with high accuracy up to 20 GHz. And the transformer coefficient varies with frequency are also studied. Simulation results suggested that the transformer coefficients will depart from the idea unit. Finally, to reduce the effect of the parasitic capacitance, two improved cross-junctions structure with concave and convex segments are also proposed.