1.8:1 Bandwidth UHF 3 X 3 Array of Crossed Open-Sleeve Dipoles
Rept. for Jul-Nov 1971
AEROSPACE CORP EL SEGUNDO CA SYSTEMS ENGINEERING OPERATIONS
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A circularly polarized nine-element 3 x 3 planar array antenna system has been evaluated for use on a synchronous satellite. The array elements are mounted on a 104-in. square reflector, and the basic radiating element is a crossed open-sleeve dipole with good VSWR and pattern characteristics over a 1.81 frequency band 225 to 400 MHz. The electrical performance of the antenna was measured using a half-scale model. It is shown that the antenna can provide an EOE gain gain in the direction of the edge-of- the-earth of greater than 14 dB from 225 to 250 MHz and greater than 11 dB from 250 to 400 MHz, based on the results of the half-scale model measurements. The measured axial ratio is less than 1.6 dB throughout the entire operating frequency band.
- Electrical and Electronic Equipment