Dual Frequency Range Antenna System.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 19, 1980
- Accession Number
- ADD007908
Entities
People
- Leonard J. Steffek
- Stanley Drake
Organizations
- United States Army