Parasitic circular polarized vertical antennas

In the space communications field it is well known that a circular polarized ground station antenna is desirable. The polarization rotation due to the Faraday Effect and the satellite attitude variation translates into a fluctuating received signal, especially in a situation in which a linear polarized antenna is used on-board a satellite, as is the case with almost all LEO (Low Earth Orbit) CubeSAT educational satellites. The use of omnidirectional vertical antennas fitted with passive, parasitic, circular polarizers for VHF/UHF bands is presented. The goal is to minimize the signal fading at low and medium elevation angles.