Accession Number : AD0281816

Title :   THE EFFECT ON THE RADIATION FROM A PLASMA SHEATH OF A UNIDIRECTIONAL SURFACE WAVE ALONG A PERFECTLY CONDUCTING PLANE,

Descriptive Note : Technical rept. no. 64

Corporate Author : WASHINGTON UNIV SEATTLE

Personal Author(s) : Ishimaru,Akira

Report Date : APR 1962

Pagination or Media Count : 26

Abstract : When an anisotropic plasma is bounded by conducting plane, a trapped surface wave can exist which propagates in a direction perpendicular to the dc magnetic field. When the plasma slab of finite thickness is placed over a conducting plane and excited by a magnetic line source which is in parallel with the dc magnetic field, this surface wave produces unidirectional leaky-wave pole, and in a certain frequency range this leaky wave pole is very close to a saddle point. The radiation pattern which results from the saddle point evaluation has a very sharp peak and the angle of this main beam can be varied as the dc magnetic field or plasma frequency are varied. It is also interesting to note that this sharp beam exists even when a plasma is opaque. In fact a considerable amount of energy transmission through the opaque plasma is possible due to the effect of this particular leaky wave mode. (Author)

Descriptors :   *ELECTROMAGNETIC RADIATION, *PLASMAS(PHYSICS), *PROPAGATION, *SLOT ANTENNAS

Distribution Statement : APPROVED FOR PUBLIC RELEASE