DESCRIPTION

The Model 815S Cavity Backed Helix Antenna was developed as part of an S-Band radar transponder system for use in Nike Tomahawk missile. It has also flown on the Apollo re-entry vehicles and the GEOS-6 satellite. The antenna is an optical quartzloaded, cavity-backed helix radiator which produces a right-hand circular polarized radiation pattern. The use of quartz material provides for high and low temperature stability with no degradation in electrical performance. Flush mounting is normally used on
reentry vehicles with no performance deterioration as a result of reentry heat. Low thermal conductivity of the quartz material controls the heat transfer from the face of the antenna window so that very little reentry heat is conducted to the antenna connector. This permits the use of standard mating connectors. The companion power dividers are Models 850-2S, 851-3S and 852-4S (two,three and four-way respectively).

FEATURES

• Developed as part of an S-Band radar transponder system
• Optical quartz-loaded, cavitybacked helix radiator which produces right-hand circular polarized radiation pattern
• High and low temperature stability with no degradation in electrical performance
• Uses standard mating connectors