Accession Number : AD0438964


Title :   EFFECTS OF RE-ENTRY PLASMA SHEATH ON ANTENNA CHARACTERISTICS


Descriptive Note : Final rept.


Corporate Author : ELECTROMAGNETIC RESEARCH CORP COLLEGE PARK MD


Personal Author(s) : Katzin, M ; Marini, J W ; Koo, B Y -C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/438964.pdf


Report Date : 30 Jun 1960


Pagination or Media Count : 89


Abstract : This report deals with various effects of the plasma which forms around a re-entry vehicle on antenna characteristics. A general formulation is developed for spherically inhomogeneous plasmas. It is shown that only the radial functions are affected by the inhomogeneity, so that results for the uniform plasma case can be extended to the non-uniform case by the substitution of the appropriate radial functions. The effect of noise generated by the plasma on the problem of signal reception aboard a hypersonic re-entry vehicle is discussed. The effective noise temperature of the plasma depends on the attenuation of the plasma. Thus, the optimum frequency for reception usually will be significantly lower than for transmission. An optimization procedure is described.


Descriptors :   *REENTRY VEHICLES , *PLASMAS(PHYSICS) , DISTRIBUTION , REFRACTIVE INDEX , VOLTAGE , SPHERES , REFLECTION , ANTENNAS , INTERFERENCE , GEOMETRY , EQUATIONS


Subject Categories : Guided Missile Reentry Vehicles
      Plasma Physics and Magnetohydrodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE