Accession Number : ADD008241

Title :   Antenna Feed for Scan-with-Compensation Tracking.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Woodward,Elmer D

Report Date : 06 Jan 1981

Pagination or Media Count : 9

Abstract : This patent discloses an antenna feed for decreasing the scan modulation of the radiated signal of a radar which tracks by the method known as scan-with-compensation. The antenna feed is comprised of a coaxial line fed dipole located on the axis of a circula waveguide for radiating a single on-axis unmodulated pencil-beam during transmission. The antenna feed further comprises two parallel radiators located equally distant and on opposite sides of the transmitting circular waveguide radiator and functions during reception only. Rectangular waveguides connect the two parallel radiators with the central radiator so as to give rise to orthogonal signals in the central radiator upon reception of echo signals. An ATR tube connects the dipole to the central axial waveguide during transmission and isolates it during reception. The radiating dipole is mounted so as to remain fixed while the central circula waveguide and the two parallel reception waveguides rotate during scanning.

Descriptors :   *Patents, *Antenna feeds, *Radar scanning, *Radar tracking, Coaxial cables, Dipole antennas, Waveguide couplers, Parallel orientation, Radiators(General), Echoes, Reception, Scanning, Signals, Modulation, Radar

Subject Categories : Electrical and Electronic Equipment
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE