225-400 MHz Antenna System for Spin-Stabilized Synchronous Satellites
Abstract
A wideband, circularly polarized antenna system has been developed for use on spin-stabilized synchronous satellites. The satellite is assumed to be a right-circular cylinder of 84-in. diam and 77.3-in. height. The antenna consists of two circular arrays of 12 radiating elements equally spaced around the circumference of the satellite. The axial spacing between the two arrays is 40 in. The basic radiating element is a crossed dipole with flat open sleeves, and the VSWR is less than 2.5:1 over a 1.8:1 frequency band (225 to 400 MHz). Both the dipoles and sleeves are of wire-grid construction for minimization of solar cell shadowing. The electrical performance of the antenna is established on the basis of half-scale model measurements. It is shown that the antenna can provide an EOE gain (gain in the direction of the edge of the earth) of more than 9.3 dB from 225 to 250 MHz and at least 8.5 dB from 250 to 400 MHz.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 15, 1972
- Accession Number
- AD0893125
Entities
People
- Howard E. King
- Jimmy L. Wong
Organizations
- The Aerospace Corporation