Impedance analysis is very important for antenna design. In this chapter, the internal impedance of the plasma antenna is analyzed by building the model of high-frequency electromagnetic waves acting with plasma. At the same time, a model of surface current for plasma antenna is developed in accordance with the eigenvalue equation of guided mode, and the radiation resistance of plasma antenna is analyzed according to the method of Poynting vector. From the results, we find that the internal impedance and the radiation resistance of the plasma antenna are affected distinctly by the plasma density and electron-neutral collision frequency. The internal resistance could be reduced, and the radiation resistance would be added efficiently by increasing the plasma density and decreasing the collision frequency.
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