Particle-In-Cell Simulations on Antenna Characteristics in Space Plasma

Details Particle-In-Cell Simulations on Antenna Characteristics in Space Plasma Particle-In-Cell Simulations on Antenna Characteristics in Space Plasma

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm23a0470u&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM23A-0470

Physics

7843 Numerical Simulation Studies, 7855 Spacecraft Sheaths, Wakes, Charging, 0609 Antennas, 0654 Plasmas

Scientific paper

Antenna properties in plasma have been investigated by many scientists. However, the analysis of the antenna impedance is very complex because the plasma is a dispersive and anisotropic medium. In the previous theories, approximations in the current distribution along the antenna or the sheath structure around the antenna were hired. Meanwhile, recent progress of computer facilities enables us to analyze the antenna properties in vacuum with the FDTD (Finite Difference Time Domain) method which solves the Maxwell equations with spatial and temporal grid points. However, the FDTD method with a dielectric tensor obtained under the cold plasma approximation can not treat plasma kinetic effects on antenna properties. In the present study, we applied three-dimensional PIC electromagnetic simulations to examine the plasma kinetic effects on the dipole antenna properties. We particularly focus on the dependence of antenna resonance on the plasma temperature and sheath size around the antenna. Preliminary results will be also shown on the effects of photo-electron emission on the antenna impedance.

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