Design of Conical Broadband Four-arm Sinusoidal Navigation Antenna

A broadband satellite navigation jamming antenna is designed, that a new type of broadband four-arm sinusoidal antenna with dual circular polarization and unidirectional radiation is proposed. Different from the traditional design, it is realized in a conical form in structure, and it can obtain unidirectional radiation without a ground plane or a reflecting cavity. The feeder network is composed of a 3dB bridge and two broadband baluns. 1-3GHz is the working bandwidth of the antenna, the simulated axial ratio is less than 3dB, and the gain within the bandwidth is greater than 4dBic. Based on the simulation, the measured and analysis are carried out. The VSWR of the measured is less than 2.2, and the gain is greater than 2dBic, which is consistent with the simulation results. The antenna has the advantages of wide bandwidth, dual circular polarization, unidirectional radiation, light weight, and low cost, and can meet the requirements of engineering applications.