Discrete Amplitude Shading for Lobe-Suppression in Discrete Array.
DEPARTMENT OF THE NAVY WASHINGTON DC
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This patent discloses a discrete transducer array of a plurality of discrete transducer elements, so connected as to achieve a good array directivity pattern with as narrow a beam width as possible for a given side lobe level, or as low a side lobe level as possible for a given beam width, or the most favorable combination of the two. This is to be done with the restriction that there is a discrete array of, say 24, elements that must be shaded discretely, for example by using a series-parallel combination of the elements. This shading method achieves side lobe levels below -25.7 db with a major lobe half-power beam width 14 larger than the unshaded 24-element transducer. This transducer has optimum four-zone shading that incorporates the methods of this invention.
- Test Facilities, Equipment and Methods