Accession Number : ADD009150

Title :   Discrete Amplitude Shading for Lobe-Suppression in Discrete Array.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Martin,Gordon E

Report Date : 22 Sep 1981

Pagination or Media Count : 8

Abstract : 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 1/4 larger than the unshaded 24-element transducer. This transducer has optimum four-zone shading that incorporates the methods of this invention.

Descriptors :   *Patents, *Arrays, *Transducers, Inventions, Sidelobes, Amplitude, Width, Shadows

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE