Experiment research of high power helical array antenna fed from double-layered radial waveguide

The helical array antenna fed from radial waveguide is a kind of new antenna to realize the directional radiation of high power microwave. In this paper, the optimized simulation result of a helical array antenna fed from double-layered radial waveguide is presented and some experiment researches are developed for an antenna fabricated according to simulated structure. During experiment researches, an impedance converter is designed to connect the standard port with the antenna input port, and the method of comparing with standard linear polarized antenna is used to measure array antenna circular polarized gain. The experiment result shows that, in the range of 3.8 GHz to 4.2 GHz, the antenna gain is over 19.7 dB, the antenna aperture efficiency is over 42%, the antenna axial ratio is belo