| 摘要 |
<p>The arrangement is for cancelling unwanted sidelobes in travelling-wave arrays, especially the back lobe (5) where the main beam (4) approaches the end-fire direction; the array should have high symmetry, ie, with the usual form of array (radiators spaced along a single feeder), the radiation patterns when fed from either end should be mirror images. Cancellation is obtained by having feed connections (2, 2') at both ends of this form of array (1), the feed at one end being attenuated (8) relative to the other and effectively subtracted (6) therefrom. In RF form, for receiving or transmitting, the subtraction can be effected by phase-reversing (7) the signal in one of the feed connections. In baseband form, suitable for receiving only, diodes are included in both feed connections and subtraction performed at baseband frequency.</p> |
