Optimization of Grid Antenna 2.4 GHz Using Grid Reflector and Yagi Antenna's Feed Modification

Abstract

The Wi-Fi parabolic grid is the best long range antenna for point to point or point to multi point links. The parabolic grid has a very high gain and a very narrow beamwidth which makes it a favorite antenna for such applications. However, it is possible to increase the antenna parameter such as gain and beam pattern. The excellent front-to-back ratio helps to reduce unwanted interference. The purpose of this work is to investigate how the arrangement of feeding antennas can affect the parabolic grid antenna performance. The optimization has been performed analytically and numerically using CST simulation via re-arranging different types of reflectors and feeding points. Simulation process helps to determine the type of the reflector and the feeding point that produce higher gain and a high-grade beam pattern. Afterwards, fabrication the design and measuring the antenna are the following steps. The reflector modifications include the changes in the number of the grid segments, and adding a solid material at the center of the reflector. The feed point modification uses five elements yagi antennas. The measurement results of the reflector and feed point optimization has improved the gain parameter from 24 dBi to 26.02 dBi for normal grid parabolic Wi-Fi antennas. The radiation pattern is directional with a beamwidth of 7° in horizontal polarization and a beamwidth of 18° in vertical polarization while the obtained antenna bandwidth is about 57 MHz.