Ka-Band Circularly Polarized High Efficiency Wide Band Reflectarray Using Cross Bow-Tie Elements
For long distance communication, e.g., satellites, radars, remote sensing, radio astronomy etc., high gain antennas with narrow HPBW (Half Power Beam Width) are desired. Traditional arrays, with array theory method or parabolic antennas with geometrical optics principle, are normally designed for these requirements. These traditional arrays require complex feeding network, which are difficult to design for large arrays operating at high frequencies. The feeding network designed for the array elements uses transmission lines which increase the antenna losses through the long path for the RF signal.