Multiband microstrip antenna with circular polarization for wireless local area network

This paper presents a design of a low profile, multiband square Microstrip patch antenna with Circular Polarization (CP) for WLAN applications. By simulation and fabrication, it is demonstrated that multiband operation with CP is achieved by incorporating various slots on the Microstrip patch. Microstrip feed is used to excite the single square patch. Proposed antenna shows multiband characteristics at frequency bands2.31 GHz to 2.48 GHz, 3.88 GHz to 3.94 GHz and 4.41 GHz to 4.53 GHz with impedance bandwidths 3.5%, 2.9% and 10.6% respectively. The antenna also produces circular polarization at frequency 2.39 GHz which focuses on the fact that this antenna finds its application in WLAN.