Accession Number:

AD0019235

Title:

Wide-Band Directivity of Receiving Arrays

Descriptive Note:

Technical memo.

Corporate Author:

HARVARD UNIV CAMBRIDGE MA ACOUSTICS RESEARCH LAB

Personal Author(s):

Report Date:

1953-05-01

Pagination or Media Count:

30.0

Abstract:

The method of maximizing the directional gain of a receiving array is extended to the case of operation at a finite bandwidth. Design procedures are given for maximum effective gain in the presence of noise which might arise within the individual transducers or their preamplifiers. Some necessary noise- field correlations are computed, and numerical examples are included to show the effects of bandwidth and self-noise on the over-all gain for reception which can be achieved. The directional gain of a broadside linear array for operation at a finite bandwidth is always less than that for operation at a single frequency, but is always greater than the gain realized by use of the single-frequency design at the finite bandwidth. Unlike the single-frequency design, whose directional gain falls very rapidly as the operating bandwidth is increased from zero, the wide-band designs operate with good gain over a wide range of bandwidths.

Subject Categories:

  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE