These research project is mainly focused on the development of Circularly Polarized Microstrip Array Antenna for Point-to-Point Application. The antenna for point-to-point application is develop to transmit and received the communication signal. Usually, the point-to-point application required two station to communicate to each other like a base station. The antenna at a base station are placed at a high place to avoid out the interferences. In this research, microstrip antenna which have light weight characterize is design to ease the installation for the base station. The circular polarization is proposed to limit the limitation of linear polarization which is less reliable in base station antenna. The circular polarization antenna is made to allow the receiver constantly receive the power at any wave angle and make the transmission between two antennas are more constant. The circular polarization antenna is realized by applying 3 different techniques in the design which are truncated-edge, inclined slot and side feed. The array antenna is implement in this research in order to increase the antenna gain which is required in point-to-point application. The proposed design was compared by 3 difference array configuration which are 1x1 array, 2x1 array and 2x2 array etched on Rogers RT 5880 substrate with 2.2 and 0.51 mm of dielectric constant and thickness respectively. Multilayer substrate antenna is made to increase the thickness of the substrate which is layered by 3 layers of Rogers RT 5880 which makes the thickness of the antenna is 1.53 mm. These 3 design produced circular polarization antenna since obtained the axial ratio below than 3 dB. The 2x2 array antenna produce circular polarization capability which have the axial ratio of 1.54 dB and also obtained are high gain of 13.27 dB. The antenna is operated at 5.8 GHz which is an ideal frequency for point to point communication that used in base station application.
