Accession Number : ADP001110

Title :   Space-Fed, Offset, Plane Wave Cassegrain System for EHF Applications,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Schwab,L. M. ; Dion,A. R. ; Washington,D. L.

Report Date : JAN 1983

Pagination or Media Count : 25

Abstract : This paper describes the study of a spatial combining approach to achieve a tractable design for a physically compact EHF satellite earth terminal antenna system which would address and overcome current 44 GHz solid state RF power generation limitations. Specifically, the achievement of high values (>55 dBW) of uplink EIRP at 44.5 GHz with the use of small diameter (<or= 24 inches) reflector antennas and a single feed requires higher levels of power amplification (typically 10 watts) than currently achievable with individual solid state EHF devices. A solution to this problem is to use spatial power combining of the outputs of an array of feed horns individually driven by low power solid state amplifiers phase locked to a common source. This paper describes the numerical study of such an array used with an offset, plane-wave fed, near-field Cassegrain reflector system.

Descriptors :   *Directional antennas, *Antenna feeds, Solid state electronics, Near field, Power amplifiers, Spatial distribution, Extremely high frequency, Feeding, Tractable, Arrays, Power, Antennas, Diameters, Symposia, Reflectors, Sources

Distribution Statement : APPROVED FOR PUBLIC RELEASE