Abstract
This paper presents the results of the investigation for the receiving antennas with directional gain in order to receive the GPS signals in the geostationary orbit. For the use GPS in geostationary orbit the receiver has to process signals that come from the other side of the earth. It is desired to receive two frequency of GPS signals (L1 : 1575.42MHz/L2 : 1227.6MHz) in order to correct the Ionospheric delay. The radiation analysis is performed in order to examine the gain pattern and the directional characteristics of the helical antenna. The computed gains at L1 and L2 of the helix antenna is +15.9 dBi and +13.6 dBi respectively with beamwidth of 25 degrees after this analysis. The computed voltage standing wave ratio (VSWR), gain pattern and axial ratio characteristics agreed well with the measured data of the prototype quadrifilar helical antenna.
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