Accession Number : ADP005419

Title :   Review of Spherical Near-Field Measurements,

Corporate Author : SCIENTIFIC-ATLANTA INC GA

Personal Author(s) : Hess,Doren W.

Report Date : FEB 1987

Pagination or Media Count : 16

Abstract : Over the past decade spherical near-field measurements have made the transition from research to application. Based upon spherical modal expansion and a port-to-port transmission equation, the spherical near-field technique utilizes sophisticated mathematical processing to solve the practical problem of obtaining antenna pattern measurements in a confined space. Coventional hardware--consisting of rotary test positioners, signal sources and receivers augmented by digital control electronics and minicomputers--now makes spherical near-field measurements practical by automation. Recent developments in spherical near-field software architecture have expanded the basic scanning feature to include dual-port scanning, probe pattern and probe polarization correction, three antenna polarization measurements, gain comparison measurements and correction for thermal drift of the system.

Descriptors :   *RADIATION MEASURING INSTRUMENTS, *NEAR FIELD, *ANTENNA RADIATION PATTERNS, RECEIVERS, ELECTRONIC SCANNERS, CONTROL SYSTEMS, ROTATION, SPHERES, AUTOMATION

Subject Categories : Test Facilities, Equipment and Methods
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE