Design of Broadband Miniaturized Microstrip Array Antenna with Circular Polarization for Use in Anti-GPS Systems

In this paper, a broadband miniaturized microstrip array antenna with circular polarization is proposed and designed for use in anti-GPS systems that have a single port. The working process is that first, a broadband antenna is designed to increase the bandwidth and the appropriate gain with circular polarization. Then, by designing a one-to-four divider whose output has a 90-degree phase difference and connecting it to four antennas that rotate 90 degrees to each other, a 2*2 array antenna is obtained. The distance of these antennas is designed so that the zero pattern is located at +90° and -90° angles to be resistant to GPS jammers. The results of the designed full-wave antenna are discussed and evaluated in this article. One of the uses of this antenna is to use it on drones that find their position through GPS.