Theoretical analysis and numerical simulation of 16-element radial line helical rectangular array antenna

Radial line helical rectangular array antenna is a new antenna which realizes the directional radiation of circularly polarized microwave, and can be easily assembled to a high gain antenna. In this paper, the fundamental theory is introduced, and a helical rectangular array antenna of 16-element using two kinds of coupling probes is put forward. The numerical simulation result shows that at 4.0 GHz, the gain of the antenna is 18.24 dB and the axial ratio at the normal direction is 1.065. In the range of 3.8 GHz to 4.2 GHz, the gain is greater than 17.89 dB, the axial ratio is below 1.2, the voltage standing wave ratio is below 1.3, and the aperture efficiency is over 85%.