H - Electricity – 01 – Q
Patent
H - Electricity
01
Q
351/19
H01Q 3/00 (2006.01) G01S 13/44 (2006.01) H01Q 3/30 (2006.01) H01Q 25/00 (2006.01) H01Q 25/02 (2006.01)
Patent
CA 1200595
ABSTRACT OF THE DISCLOSURE A MONOPULSE RADAR ANTENNA The antenna comprises an array of radiating elements 32 arranged in pairs symmetrically about the bore-sight axis 38. Four hybrid rings 40 form the sum and difference of the signals received by a respective inner pair of elements 32. The outputs of the hybrid rings are summed and applied to a sum output line 46a and a difference output line 46b. The signals received by the four elements 32 at each end of the array are summed separately and applied to a fifth hybrid ring 50. The outputs of the hybrid ring 50 and the output lines 46a, 46b are combined and fed to a sum port 34a and a difference port 34b. For generating a secondary surveillance control pattern, a directional coupler 66 divides power at a control port 67 in opposite phases between a central control element 64 and the sum port divider 56a of the feed network. The main interrogation is effected by pulsing the sum port 34a; the coupler 66 routes this power mostly to the divider 56a with a small amount to the central element 64.
433941
Cossor Electronics Limited
Fetherstonhaugh & Co.
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