Effect of aperture field distribution on the maximum radiated power at atmospheric pressure

Abstract

The air breakdown in the high-power antenna near-field region limits the enhancement of the radiated power. A model coupling the field equivalent principle and the electron number density equation is presented to study the breakdown process in the near-field region of the circular aperture antenna at atmospheric pressure. Simulation results show that, although the electric field in the near-field region is nonuniform, the electron diffusion has small influence on the breakdown process when the initial electron number density is uniform in space. The field magnitude distribution on the aperture plays an important role in the maximum radiated power above which the air breakdown occurs. The maximum radiated power also depends on the phase difference of the fields at the center and edge of the aperture, especially for the uniform field magnitude distribution.

Effect of ambient gas species on microwave breakdown pattern

“…1) A lot of studies concentrated on the determination of the breakdown threshold for a given pulse duration, gas composition, and pressure. [2][3][4][5][6][7][8][9][10] In recent years, the plasma patterns in the microwave breakdown have been captured by a fast camera. [11][12][13] The experiments of Hidaka et al showed that the regular filamentary arrays form in the air breakdown at 110 GHz and high pressures.…”