| 摘要 |
<p>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.</p> |
