Slotted Circular Microstrip Patch Antennas for Dual Band Applications

This paper presents a circular shaped microstrip patch antenna having a single rectangular slot at the top and two symmetrical slots on either side of the feed which is excited through an inset feed. Simulation results show that the designed antenna can be used as a single band and dual band modes (TM01& TM11). For the proposed antenna TM11 is the fundamental as well as the dominant mode. For the proposed antennas with two rectangular slots, there is an increase in the percentage bandwidth by 0.7% and return loss by -5.1dB with respect to no slot circular patch antenna. The single band antenna is converted into dual band by introducing rectangular slots on circular patch antennas which are mainly used for WLAN, GPS and DCS applications