Accession Number : AD0769957

Title :   Effects of Plasma on Polyrod Antenna.

Descriptive Note : Interim technical rept.,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : Taylor,W. C.

Report Date : MAR 1973

Pagination or Media Count : 39

Abstract : The report describes predictions for reentry attenuation of a polyrod antenna covered by a conical nose cone. It also details the steps leading to these predictions, which are: (1) Determination of reentry-plasma properties from previous calculations and flight-test measurements. (2) Measurements of attenuation and pattern changes as the reentry plasma was simulated over the nose cone. The plasma at low altitudes was simulated by using a high-loss dielectric called space cloth. For high-altitude simulation, high-power X-band pulses fed through the same polyrod antenna were used to ionize a thin layer of helium around the cone. Predictions are given for various nose radii and for either teflon or carbon cone material. (Author)

Descriptors :   *Antennas, *Plasma sheaths, Reentry vehicles, Attenuation, Nose cones, Predictions, Antenna radiation patterns

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE