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) : Faran, James J ; Hills, Robert, Jr


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/019235.pdf


Report Date : 01 May 1953


Pagination or Media Count : 30


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.


Descriptors :   *ANTENNA RADIATION PATTERNS , FREQUENCY , PREAMPLIFIERS , GAIN , TRANSDUCERS , DIRECTIONAL , LINEAR ARRAYS , RANGE(EXTREMES) , BANDWIDTH


Subject Categories : Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE