Axial ratio reduction by optimizing feed network of a pifa antenna

In this paper, three element Planar Inverted F antenna is studied for IoT communication from Low Earth Orbit Satellite. Apparent advantages of planar inverted-F antennas for satellite communication makes this topology a strong candidate for small aperture satellite antennas. These advantages can be listed as wide beamwidth, circular polarization on zenith direction and possibility to use as a gateway antenna simultaneously. The antenna consist of two part. One of them is placed at the top as radiating elements and this part consists of tree inverted F elements placed circularly at 120 degree intervals. A serial power divider circuit, placed on the bottom of the structure. The aim of serial power divider is deliver equal amplitude to each antenna element. The RF signal is transmitted with sequential 120 degree phase shift to the antenna elements to provide circular polarization. The antenna has simulated on simulation software tool and both layers are produced with low cost FR4 material. The antenna has been measured in outdoor.