Accession Number : ADP004632

Title :   Probe Correction for Near-Field Antenna Measurements,

Corporate Author : MITRE CORP BEDFORD MA

Personal Author(s) : Yaghjian,A. D.

Report Date : JAN 1985

Pagination or Media Count : 39

Abstract : To quote Kummer and Gillespie (Proc. IEEE, April, 1978), 'The antenna measurements' problem is now of equal difficulty with that of design; now the antenna engineer often has to design the antenna as well as the method of measurement.' In addition they state that 'The near-field technique may well become accepted as the most accurate technique for the measurement of power gain and of patterns for antennas that can be accommodated by the measuring apparatus.' However, in order to accurately determine the far fields of antennas from near-field measurements, one has to correct, in general, for the nonideal response of the measurement probe. In this paper we review planar, cylindrical, and spherical scanning; and show how probe correction can be introduced as a simple modification to near-field scanning with ideal dipole probes that measure the electric or magnetic field at a point. Data sampling spacing, efficient computational methods, and experimental errors involved with near-field measurements are also discussed. (Author)

Descriptors :   *ANTENNA RADIATION PATTERNS, *PROBES, *DIRECTIONAL ANTENNAS, NEAR FIELD, MEASUREMENT, ELECTRONIC SCANNERS, ERRORS, GAIN

Distribution Statement : APPROVED FOR PUBLIC RELEASE