Design and Development of 6 dB Microstrip Directional Coupler at C-Band Using Defective Ground for Tracking Application

Abstract

This paper describes the design and development of 6 dB microstrip directional coupler at C-band using Defective Ground Structure (DGS). The required defective ground effect has been implemented using floating ground structure along with stubs for optimization of coupling as well as return loss over 200 MHz of bandwidth. This coupler has been used for tracking application in monopulse scan converter with the provision of scanning in azimuth direction. The realized hardware achieves the minimum modulation depth of 75% for the desired frequency band.