On the design defected ground plane based L slotted microstrip patch antenna for C band applications

A co-axial feed Microstrip Patch Antenna (MPA) operating at 4.6 GHz frequency, with four symmetric L shaped slots is presented in this paper. The proposed antenna is designed using Roger RT Duroid 5880 substrate material having dielectric constant 2.2 and thickness 4.0 mm. This antenna with Full Ground Plane (FGP) has return loss is -17.91dB and gain 7.9dB is achieved but by defecting the ground plane return loss and gain are further improved to -21.23dB and 8.4dB respectively. The performance parameters of antenna such as Voltage Standing Wave Ratio (VSWR), Return Loss (RL), gain and radiation pattern are simulated using Ansoft High Frequency Structure Simulator (HFSS) software. The performance parameters of conventional antenna, proposed antenna with full and Defected Ground Planes (DGPs) are compared in this paper. It is found that defected ground plane antenna has better results than conventional and the antenna with full ground plane.