Development of Compact Coupler Devices on Electrody-Namic Structures with Different Thickness Substrates

In this paper, using a program of electrodynamic analysis of the NI-AWR Design Environment 13, compact branch-line coupler were designed with different substrate thicknesses using electrodynamic structures. Based on the obtained results, the influence of the thickness of the material used on the effectiveness of miniaturization of coupler was analyzed. The process of reducing the geometric dimensions consists in replacing the quarter-wave segments by synthesized electrodynamic structures that have similar characteristics at the central frequency and in its vicinity. With the help of the AWR program, three designs of a branch-line coupler with a thickness of 1, and 1.5 mm have been analyzed and, from the data obtained, it can be concluded that the smaller the thickness of the substrate, the higher the efficiency of miniaturization of the coupler.