Rotating dual frequency range antenna system

Details Rotating dual frequency range antenna system Rotating dual frequency range antenna system

1980-09-19

1982-02-16

Moore, David K.

Communications: radio wave antennas

Antennas

With means for moving directive antenna for scanning,...

343872, 343754, 343755, 343840, H01Q 300

Patent

active

043161952

ABSTRACT:
Disclosed is an antenna system designed to operate in two frequency ranges imultaneously, namely S-band (1660 to 1700 MHz) and X-band (8500 to 9600 MHz). 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.

REFERENCES:
patent: 2942264 (1960-06-01), Ratkevick
patent: 3277490 (1966-10-01), Williams

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