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
References in periodicals archive ?
Figure 16 shows the significant outperformance of our directional antenna scheme as compared with the omnidirectional antenna scheme.
Panduro "Statistical cellular Gaussian scatter density channel model employing a directional antenna for mobile environments," AEU-Int.
The analysis of directional antennas for CR can be carried out through measurements, modelling, and/or emulation.
Interference Mitigation in WSN by Means of Directional Antennas and Duty Cycle Control // Wireless Communications and Mobile Computing, 2010.
As for a directional antenna used in mmWave networks, there can be two candidates as the antenna model: the flat-top model neglecting the side-lobe of the radiation and the cone plus circle/sphere model considering the side-lobe of the radiation.
A bottom directional antenna offers the benefit of intruder target recognition for traffic that's hidden from that top antenna by the fuselage of the aircraft.
The 525 works with your existing VHF transceiver; you add the supplied Adcock directional antenna and any transmission you can pick up in the marine band/ham bands, including 121.5 and 130-180 MHz, is converted to a visible on-screen signal with bearing from your boat to the source.
Parabolic-reflector antennas are widely used as microwave directional antennas. Unfortunately, the illumination of a parabolic mirror becomes rather inefficient when the dimensions of the mirror are not large enough compared to the wavelength.
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.
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.
Shea also set up an Omni directional antenna at the sales office, which broadcasts to two remote construction trailers, each of which has a 12-inch DBI dish.
Jansky's highly directional antenna pinpointed this source somewhere in the sky.

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