Theoretical analysis and numerical simulation of 4-element rectangular helical array antenna fed from radial waveguide

A helical rectangular array antenna of 4-element using L-shaped coupled probes is put forward, which is helical rectangular array antenna fed from radial waveguide and can be used to realized the directional rediation of microwave. Theoretical analysis and numerical simulation show that the antenna is subject to the exiting uniform of each elements and the consistency versus frequencies. The directivity is 12.57 dB and the axial ratio at the normal direction is 1.55 at 4.0 GHz. In the range of 3.60 GHz to 4.05 GHz, the directivity is upon 11.6 dB, the axial ratio is below 1.55, and the reflecting coeffiecient is 0.2.