Improved Directivity for Multi-Layer configured Microstrip Directional coupler using ANSYS

Abstract

Abstract: Directivity of microstrip directional coupler is measured based on its scattering parameters and coupling factor, directivity and isolation factor. Directivity of the microstrip directional coupler is very low, to overcome these problems many methods were applied like lumped capacitor, lumped inductor, implementing wiggling edges. In this paper we introduce a compensation method to improve directivity, i.e. multilayer configuration. This method valid for tight and closed loop structures. Proposed method is designed by using HFSS software and experimental results will show, multilayer configuration is the best suitable method to improve directivity of directional coupler.