Accession Number : ADA300717

Title :   GPS/GNASS Compatible Antennas,

Corporate Author : NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH

Personal Author(s) : Zhang, Fenglin

PDF Url : ADA300717

Report Date : 25 SEP 1995

Pagination or Media Count : 19

Abstract : This article introduces a type of GPS/GLONASS compatible receiving antenna. It is an improvement on a four arm fractional type screw antenna. It opts for the use of such technologies as self phased as well as open slot coaxial line top feed, and so on, in order to make antenna structure compact and volumes small. Introducing sleeve type reflectors, the symmetrical properties of antenna directional diagrams were very, very greatly improved, lowering rear lobe power levels. In conjunction with this, use is made of designs associated with transmission line theory on self-phased antennas to carry out theoretical analysis. Formulas were deduced for self-phased antenna designs. Test measurement results clearly show that, within GPS/GLONASS operating frequencies, the stationary wave ratio < 1.2. The axial direction gain is approximately 4.2dB. When angles of elevation are over 10 deg, gains are >or= 2dBi.

Descriptors :   *GLOBAL POSITIONING SYSTEM, *SATELLITE ANTENNAS, MEASUREMENT, RATIOS, SHAPE, TRANSMISSION LINES, SYMMETRY, GAIN, NAVIGATION SATELLITES, TRANSLATIONS, ELEVATION, ANTENNA RADIATION PATTERNS, DOMES(STRUCTURAL FORMS), REFLECTORS, CHINA, DIAGRAMS, CHINESE LANGUAGE, DIRECTIONAL ANTENNAS, SLOT LINES.

Subject Categories : Unmanned Spacecraft
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE