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In this paper, we present about the study of directivity of microstripline directional coupler and design the 6 dB coupler. The importance lies in the present study of light weight, small size and lower cost planer transmission structure like MIC’s of communications. Also, in the fact that radio astronomers use these frequencies to study electromagnetic radiation originating from stars & others celestial objects.

Several authors have developed various methods for the study of characteristics of single & coupled microstriplines. This paper deals with the analytical studies of the design synthesis of microstripline couplers and their variation with geometry and frequency using Alumina substrates for the design synthesis of the microstripline coupler which is the aim of the present work. All the parallel line couplers, whether mode of propagation is true TEM or not, have the even and odd-mode property which always results in even- mode characteristic impedance (Zoe) and odd-mode characteristic impedance (Zoo).