directional antenna


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Related to directional antenna: omnidirectional antenna

directional antenna

[də′rek·shən·əl an′ten·ə]
(electromagnetism)
An antenna that radiates or receives radio waves more effectively in some directions than others.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

directional antenna

An antenna or aerial that radiates and receives signals mainly from one direction. For terrestrial radio communications, directionality in an azimuth or a horizontal plane is important. Directional antennae are either monodirectional, bidirectional, or omnidirectional (i.e., their maximum gain is either in one or two opposing directions or in all directions in one plane). Sophisticated directional antennae provide a large gain in their favored direction. A group of antennae arranged for this purpose is called an antenna array.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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Figure 16 shows the significant outperformance of our directional antenna scheme as compared with the omnidirectional antenna scheme.
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Because the receiving also occurs in the same donut-shaped pattern, an omni-directional antenna actually collects much more ambient noise from the surrounding area then a directional antenna. In many cases, you might be able to architect your network using a series of point-to-point backhaul links, instead of using large omni-directional antennas in a hub-and-spoke design.
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The Crowne Plaza Irvine also uses the NETGEAR ANT24D18 Indoor/Outdoor 18dBi Patch Panel Directional Antenna. It offers flexibility in optimizing range and wireless coverage in a variety of indoor and outdoor environments including single floor, multi-floor, and building-to-building connectivity in campus environments.
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