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):

Report Date:

1981-09-22

Pagination or Media Count:

8.0

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 14 larger than the unshaded 24-element transducer. This transducer has optimum four-zone shading that incorporates the methods of this invention.

Subject Categories:

  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE