GPS/GNASS Compatible Antennas,
NATIONAL AIR INTELLIGENCE CENTER WRIGHT-PATTERSON AFB OH
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This article introduces a type of GPSGLONASS 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 GPSGLONASS 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.
- Unmanned Spacecraft
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