Dual Frequency Range Antenna System.
DEPARTMENT OF THE ARMY WASHINGTON DC
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Disclosed is an antenna system designed to operate in two frequency ranges simultaneously, namely S-band 1660 to 1700MHz and X-band 8500 to 9600MHz. The system comprises two separate antennas which are conically scanned and share a common parabolic reflector within a radome. The S-band antenna is adapted for passive angle tracking and reception of radiosonde data by means of a balun fed dipole feed system which includes an offset hemispherical reflector which is rotated by a scan motor to provide conical scanning. The X-band antenna comprises an active feed system which includes a stationary feedhorn and a tapered dielectric lens which is coupled to the S-band hemispherical reflector and is rotated therewith about an axis through the vertex of the parabolic reflector. The tapered lens tilts the constant phase front of the X-band radiation pattern thereby producing a displaced phase center near the focus of the antenna to implement its respective conical scanning operation. Author
- Electrical and Electronic Equipment