Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1980-01-24
1981-09-22
Farley, Richard A.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367905, H04R 132
Patent
active
042913969
ABSTRACT:
A discrete transducer array of a plurality of discrete transducer elements, o 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.
A particularly favorable combination using 24 elements comprises: a series combination of the three elements at one end in series with the series combination of the three elements at the other end, each element having a relative voltage amplitude of 1/6; a series combination of the next two elements at each end in series together, each of the four elements having a relative voltage amplitude of 1/4; a series combination of the next three elements at either end, each element having a relative voltage amplitude of 1/3; and eight other adjacent pairs in the central region, each element having a relative voltage amplitude of 1/2.
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.
REFERENCES:
patent: 3368190 (1968-02-01), Wilson et al.
Farley Richard A.
Johnston Ervin F.
Sciascia Richard S.
Stan John
The United States of America as represented by the Secretary of
LandOfFree
Discrete amplitude shading for lobe-suppression in discrete arra does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Discrete amplitude shading for lobe-suppression in discrete arra, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discrete amplitude shading for lobe-suppression in discrete arra will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-338942