Accession Number : ADA133241

Title :   Earth Coverage Corrugated Horns (44.5 GHz and 20.7 GHz).

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Weikle,Dennis C

PDF Url : ADA133241

Report Date : 19 Jul 1983

Pagination or Media Count : 27

Abstract : Communications satellites located in geosynchronous orbits will, in addition to more specialized shaped beam of area coverage antennas, generally utilize earth coverage antennas designed to maximize antenna gain over the entire surface of the visible earth. In the microwave and millimeter wave bands, these antennas are usually conical horns which achieve a minimum gain (G(min)) of 17 - 17.5 dBi at the limb of the earth. This paper describes the design of a single mode (ME(11)) earth coverage horn that optimizes G(min). Measurements performed over a 5% frequency band on experimental models designed to operate at 20.7 GHz and 44.5 GHz demonstrate a G(min) 17.8 dBi. Other characteristics of the horns are circularly symmetric radiation patterns, low VSWR (1.2), and peak gain of approximately 22.0 dBi. (Author)

Descriptors :   *Satellite antennas, *Communication satellites, *Horn antennas, *Antenna radiation patterns, *Synchronous satellites, Area coverage, Grooving, Earth(Planet), Millimeter waves, Gain, KU band, Extremities, Orbits, Peak values, Shape, Synchronism, Antennas, Q band

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE