Application such as aircraft stealth

ionospheric communication based on the plasma electromagnetic scattering theory has drawn deep attention from plasma technology field. A detailed theoretical analysis of plasma column antenna radiation characteristic which also based on such plasma electromagnetic scattering theory is presented. According to the azimuthally symmetric surface wave dispersion relation in the non-magnetized plasma column with presence of electron-neutral atom collisions and non-uniform plasma densities both radial and axial

the complex surface wave-vector with real and imaginary parts is studied as function of signal frequency and plasma density. Together with wave-vector

exponential distribution of the plasma column surface current model

the plasma impedance

we derived the dependence of antenna radiation pattern

the largest antenna gain and radiation impedance on signal frequency

also the dependence of antenna radial energy radiation on the plasma density. The theoretical results show that the signal frequency and plasma density have great influence on antenna radiation pattern; the antenna radiation impedance and the maximum antenna gain change obviously with signal frequency

these theoretical results are in good agreement with the experimental measured results.