Satellite-based sinusoidal Archimedes spiral antenna with circular polarization plane

In order to meet the antenna requirements of Beidou satellite service communication terminals, a design scheme of low profile planar spiral antenna is proposed. The antenna body is consisted of copper foil material, which use FR4 medium as support, in the case of limiting the overall volume of the antenna, the circular polarization radiation performance of the antenna is improved by loading a sine wave on the plane spiral shape, and the input impedance matching of the antenna is improved by three 90° bending feed terminals. The simulation results show that the antenna is in the operating frequency band of the Beidou satellite communication RDSS service, with a standing wave ratio of less than 2, a gain higher than 5 dBi, and an axis ratio of less than 3 dB, which has the characteristics of light weight, low profile and high gain, and has good radiation characteristics, which meets the radiation index of the Beidou RDSS satellite communication terminal antenna.