Accession Number : AD0479766

Title :   STUDY OF ECM ANTENNA OPTIMIZATION.

Descriptive Note : Quarterly rept. no. 2,

Corporate Author : RAYTHEON CO SUDBURY MA SPACE AND INFORMATION SYSTEMS DIV

Personal Author(s) : Rolfe, Edward

Report Date : 17 JAN 1966

Pagination or Media Count : 74

Abstract : Plasma simulation equipment permitting measurements of plasma conditions, and effect on reentry ECM antennas is described. Preliminary measurement of plasma simulator operation is reported up to 50 amps with stable, full plasma generation in the region of 27 to 32 amps, pressures of .06 to .09 torr of pure Argon gas with estimated electron concentration of 10 to the 14th power cm-3 and collision frequencies of 10 to the 7th power sec-1. Calculation of collision frequencies and electron concentrations are shown for a slender, fast reentry vehicle, and a blunt-cone slower vehicle. These calculations are related to the simulator operation conditions. Base-line data on a log-periodic antenna to be used in the plasma simulator are included. The mathematical model of the plasma is discussed. A cone, tipped by a small sphere, is used as the model, the sphere being employed to make the mathematical solution more rapidly convergent. The equations to be solved and the boundary conditions are given. (Author)

Descriptors :   *LOG PERIODIC ANTENNAS), (*ANTENNAS, REENTRY VEHICLES), (*REENTRY VEHICLES, (*SLOT ANTENNAS, REENTRY VEHICLES), (*SPIRAL ANTENNAS, REENTRY VEHICLES), ELECTRONIC COUNTERMEASURES, ATMOSPHERE ENTRY, PLASMA SHEATHS, SIMULATORS, PLASMA GENERATORS, ELECTRON DENSITY, MATHEMATICAL MODELS, EQUATIONS, SPHERES, ELECTRONS, SCATTERING, ANTENNA RADIATION PATTERNS, OPTIMIZATION.

Subject Categories : Countermeasures

Distribution Statement : APPROVED FOR PUBLIC RELEASE