Directivity Pattern


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directivity pattern

[də‚rek′tiv·əd·ə ‚pad·ərn]
(engineering acoustics)
A graphical or other description of the response of a transducer used for sound emission or reception as a function of the direction of the transmitted or incident sound waves in a specified plane and at a specified frequency. Also known as beam pattern; directional response pattern.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Directivity Pattern

 

(1) For a transmitting antenna, a graphic representation in polar coordinates of the dependence of the electric field strength of the radiated wave on the direction of radiation (assuming that the field strength is measured at a large and constant distance from the antenna).

(2) For a receiving antenna, a graphic representation in polar coordinates of the dependence of the electromotive force induced in the antenna on the direction of the incident wave (given a field strength at the antenna location that is equal for all waves incident from any direction).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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For such a line source of radiation, the directivity pattern is given by a Fourier transform[2-4] as
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Nevertheless, to obtain similar directivity patterns the lens design are considered as much longer wavelength involved in comparison with the FSS design.
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Furthermore, the directivity patterns are calculated in the xy, xz, and yz Plane cuts at 402 MHz and 2.4 GHz.
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As seen from Figure 12, the proposed antenna has directivity patterns with high gain and the range of the half-power bandwidth (HPBW) is between 30 and 120.
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Directivity patterns were compared in [23] for uniform and stepped-thickness plates and raising the steps to half a wave length of the radiated sound in the medium affected the directivity and strength of the ultrasound generation.
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