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In this paper, a car-mounted microstrip feed L-type aperture coupled circular polarization patch antenna, from which polarization characteristics can be obtained by the new-type coupling method, designed. Further consideration are given to the characteristic changes due to several design parameter changes for this antenna. Before loading the phase shifters on the array antenna, which is comprised of single circular polarization patch antennas, there is a need to design a circular polarization array antenna using a simple single microstrip line feeding method for securing the space sufficient to load the phase shifters, as this antenna, which is car-mounted, is required to have the ability to track a satellite by beam-scanning. For this, the 2/spl times/2 array antenna with in-phase feeding is designed and fabricated with several circular polarization characteristics being measured and evaluated.