Wideband Omnidirectional Circular Patch Antenna with Circular Polarization

In recent years antenna design field is achieving a great interest in several advanced technological applications. . several technologies are brought to transmit information over different bandwidth. A low-profile antenna that has a number of advantages over other antennas. Circularly polarized (CP) antennas are widely used in modern wireless systems because they can suppress multipath interferences. Omnidirectional radiation patterns are generally desirable since they can provide larger signal coverage and stabilize the signal transmission. Most modern WLANs are based on ieee 802.11 (2.4ghz) standards and are marketed under the wi-fi brand name. Here a low profile circular patch antenna is designed and several methods are studied in order to improve the bandwidth and to obtain circular polarization. Among the studied methods, the proposed antenna is designed with circular patch over a circular ground plane and vias are introduced in the patch which connects the patch and the ground plane to improve the bandwidth, also some curved branches are attached to the patch in a circular manner inorder to obtain circular polarization.