A Wide Beam and Circularly Polarized Antenna with Parasitic Element

A circularly polarized wide beam microstrip patch antenna is proposed for the low earth orbit(LEO) satellite communication. The proposed antenna consists of a radiation patch, a parasitic metal and the feed network. Wide beam radiation patterns can be obtained from 27.5 to 30.5GHz by applying a square ring parasitic elements around the radiation patch. The 3 dB beamwidth of the antenna in the 2-D space is in the range between 93° and 104°. The simulated results show that S11 is less than -10dB at the frequency range of 25.1-31.4GHz and axial ratio (AR) is less than 3dB at the frequency range of 26-30.8GHz.