Accession Number : ADP005395

Title :   An Antenna System for an EHF Satellite Earth Terminal and Its Calibration,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Rispin,Lawrence W.

Report Date : FEB 1987

Pagination or Media Count : 26

Abstract : The antenna system for a 44/20 GHz earth terminal to be used to measure on-orbit satellite performance and the facilities used in its calibration are described. Built around a 8-ft. diameter Cassegrain antenna mounted on a pedestal positioner, the entire system is enclosed within a 17-ft. diameter radome. The antenna uses a frequency-selective-surface to diplex the 44-GHz uplink signal from a scalar horn and the 20-GHz downlink signal to a five-horn tracking feed. Mounted directly to the back of the antenna are a 20-GHz receiver front-end, a 5-W 44-GHz transmitter, and a transmit power attenuator used to precisely control terminal EIRP. Individual calibration of each of these units in conjuction with gain measurements on the radome-enclosed antenna allow a prediction of the overall antenna system performance, in terms of downlink G/T and uplink EIRP.

Descriptors :   *ANTENNAS, *SATELLITE ANTENNAS, EXTREMELY HIGH FREQUENCY, RADOMES, GROUND STATIONS, TRANSMITTERS, CALIBRATION

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE