Design of CPW-Fed Antenna with Defected Substrate for Wideband Applications

In this paper, a novel design of CPW-Fed defected substrate microstrip antenna is presented. The proposed antenna shows wideband applications by choosing suitable defected crown shape substrate. Defected shape substrate also reduces the size of the antenna. The radiating patch of proposed antenna is taken in the form of extended U-shape. The space around the radiator is utilized by extending the ground plane on both sides of radiator. Simulation of proposed antenna is performed through Ansoft’s High Frequency Structure Simulator (HFSS) and simulated results shows balanced agreement with measured results. The prototype is taken with dimensions 36 mm × 42 mm ×1.6 mm that achieves good return loss, constant group delay and good radiation patterns over the entire operating bandwidth from 4.5 to 13.5 GHz (9.0 GHz) with 100% impedance bandwidth at 9.0 GHz centre frequency. Thus, the proposed antenna is applicable for C and X band applications.