Bandwidth enhancement defected ground structure microstrip patch antenna for K and Ka band applications

In this paper, a different method for designing a novel and compact microstrip patch antenna with step slots etched on the ground plane and split square ring slots etched on the patch has been designed with wide bandwidth and minimal return loss characteristic for UWB applications. The proposed antenna has been designed and simulated using HFSS. An extra rectangular slot in the ground plane is used to create an additional resonance at higher frequency. The proposed antenna can operate from 18.5939 GHz to 29.9792 GHz for VSWR <2. The Simulated results obtained for this antenna resonant frequency at 20.6281GHz with - 45.06dB and wide bandwidth is 11.3853 GHz (55.19% with center frequency) show that it exhibits good radiation behavior within the UWB frequency range.