Accession Number : ADD012075

Title :   Dipole Ring Array Antenna for Circularly Polarized Pattern.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Waineo,Douglas K ; Wong,Sam S

Report Date : 26 Nov 1985

Pagination or Media Count : 9

Abstract : A NAVSTAR satellite has a navigation antenna array beamed toward the earth. A communications antenna array for communicating with other satellites requires a pattern null near the axis and high gain to the sides with pattern null near the axis and high gain to the sides with minimum losses. This is achieved with a dipole ring array comprising eight elements surrounding the navigation array. The ring has a diameter of 1.1 wavelength, and is fed with equal amplitudes and a third mode phase progression, which produces good circular polarization in the far field. For a different sized dipole ring, there will still be an optimum phase distribution which will give good circularly polarized patterns.

Descriptors :   *PATENTS, *SATELLITE ANTENNAS, *ANTENNA ARRAYS, *ANTENNA RADIATION PATTERNS, *DIPOLE ANTENNAS, *RINGS, *NAVIGATION SATELLITES, COMMUNICATION EQUIPMENT, COMMUNICATION AND RADIO SYSTEMS, HIGH GAIN, LIGHTWEIGHT, POLARIZATION, NAVIGATION, FAR FIELD, ANTENNAS, OPTIMIZATION, PATTERNS, DISTRIBUTION, CIRCULAR

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE