Accession Number : ADD007908

Title :   Dual Frequency Range Antenna System.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Steffek,Leonard J ; Drake,Stanley

Report Date : 19 Sep 1980

Pagination or Media Count : 14

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)

Descriptors :   *Patent applications, *Parabolic antennas, *Conical scanning, Antenna feeds, Dipole antennas, Passive systems, X band, S band, Radiosondes, Dielectrics, Operation, Hemispheres, Tracking, Antennas, Feeding, Reflectors, Radomes, Lenses, Taper, Phase, Angles

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE