Abstract:Plasma antenna has unique physical properties of stealth, dynamic reconfiguration etc., which is different from metal antenna, and it shows broad application prospects in remote sensing, communications and navigation. In order to study the influence of the plasma frequency on the characteristics of the antenna, a cylindrical plasma antenna model is established in the three-dimensional electromagnetic simulation software. It is analyzed how the plasma collision frequency influences the performance of S11 curve, pattern and gain etc. and some conclusions are given.