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AS-48917 GPS Band Omnidirectional Antenna

RF design configuration is a two-arm conical log-spiral radiating element fed at the tip by a compensated balun. The spiral cone angle and the tip and base diameters were selected to provide satisfactory operation over the operational frequency band. The complementary two-arm spiral is wound to provide an inherent circular polarization. This results in broad-lobed unidirectional circularly polarized radiation off the small end or apex of the cone. It is ideal for application where hemispherical coverage is required.

The antenna is optionally provided with a nine-inch diameter ground plane (as shown in the photograph above). The mechanical configuration of the antenna incorporates materials and construction techniques which yield high reliability and low outgassing required for space operation.

AS-48917 Antenna Specifications

Frequency range 1217 to 1585 MHz
VSWR 1.5:1, max
Gain 0 dBi (at q = ±10°)
>-5 dBi (at q = ±76°)
Polarization Right or left hand circular
3 dB beamwidth 110°, min
145°, nom
Front-to-back ratio >20 dB
Axial ratio 3 dB, max, 0° to 45°
5 dB, max, ±45° to ±90°
Power handling Receive only
Connector SMA Female
Weight 6 oz/454 g
Temperature -148° F (-100° C) to +212° F (+100° C)
Thermal Vacuum 1.33 x 10-3 Newton/M2 (10-5 torr) at ±100° C (The pressure values are approximate)
Freq. (Hz) g2 dB/oct Grms Duration/Axis
20-100   +9.0    
100-200 1.0      
200-400   -6.0    
400-1000 0.25      
1000-2000   -6.0 21.9 3 min/axis

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