Wide-Band Directivity of Receiving Arrays
HARVARD UNIV CAMBRIDGE MA ACOUSTICS RESEARCH LAB
Pagination or Media Count:
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.
- Radiofrequency Wave Propagation