FURTHER EXPERIMENTAL STUDY OF PLASMA SHEATH EFFECTS ON ANTENNAS
Scientific rept. for Jan-Jul 1965
ARIZONA UNIV TUCSON ENGINEERING EXPERIMENT STATION
Pagination or Media Count:
The plasma sheath simulation technique developed earlier was use to investigate the effects of various types of sheath discontinuities and inhomogenities on a slot antenna radiation pattern and input impedance. In the case of semi-infinite and finite-extent homogeneous plasma sheaths, the radiation pattern and the impedance characteristic are investigated with regard to the geometry of the discontinuity and its proximity to the slot antenna. It is found that the radiation pattern is unaffected by the discontinuity as long as the ratio of the distance between the source and the discontinuity to the sheath thickness is of the order of 20 or greater. When the sheath is made finite in extent, with a discontinuity on each side of the slot, the resulting pattern is seen to be a superposition of the effects of each discontinuity acting separately. The effects produced by inhomogeneities are found to be similar to those of a homogeneous sheath with a certain equivalent dielectric constant. For both the homogeneous and inhomogeneous sheaths, favorable comparison with the available theory is obtained.
- Plasma Physics and Magnetohydrodynamics
- Radiofrequency Wave Propagation