directivity


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directivity

(dÿ-rek-tiv -ă-tee) A measure of the ability of an antenna to concentrate its radiation or response in a particular direction. It is defined as the ratio of the maximum radiation intensity in the forward direction to the average radiation intensity over all directions. If an antenna is operating at a wavelength λ and has an effective area A e (see array), then the directivity, D , is given by
D = 4πA e /λ2

See also gain.

Collins Dictionary of Astronomy © Market House Books Ltd, 2006

directivity

[də‚rek′tiv·əd·ə]
(electronics)
The ability of a logic circuit to ensure that the input signal is not affected by the output signal.
(electromagnetism)
The value of the directive gain of an antenna in the direction of its maximum value.
The ratio of the power measured at the forward-wave sampling terminals of a directional coupler, with only a forward wave present in the transmission line, to the power measured at the same terminals when the direction of the forward wave in the line is reversed; the ratio is usually expressed in decibels.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Ferrando-Bataller, "Low-profile planar lens with multilevel FSS for directivity enhancement," in 2014 IEEE Antennas and Propagation Society International Symposium (APSURSI), pp.
Analysis and Design of a Metamaterial Lens Antenna Using the Theory of Characteristic Modes
The term "directivity pulse" usually refers to "forward directivity pulses", which are more critical to engineered structures (Cox and Ashford, 2002).
Analysis of cylindrical tunnels under combined primary near fault seismic excitations and subsequent reverse fault rupture
This way, they made in-phase the regions of the plate which had been previously radiating in counter phase resulting in good directivity for the frequency range of 20-27 kHz.
On the Development of Focused Ultrasound Liquid Atomizers
The field thus generated by the driven patch is coupled with the parasitic patch to improve the overall bandwidth, directivity, gain and overall efficiency of the structure.
Design of broadband microstrip patch antenna using stack and notch techniques
However, the study lacked major design parameters like gain, directivity and h-field which are required to claim a better antenna design.
DESIGN OF NEAR FIELD COMMUNICATION PASSIVE ANTENNA FOR CIRCULAR SHAPED WEARABLE ITEMS
Increasing directivity decreases the impact of ISI effect.
MITIGATING ISI IN CELLULAR NETWORKS FOR A 3D SCATTERRED MODEL
On the basis of previous research, we propose the following neural network model to study the characteristics, bistability, directivity, and spontaneity, of the up and down transitions that have been observed in electrophysiology experiments.
Neurodynamics of up and down transitions in network model
As the directivity of the interest is in the coverage angular range not only in the maximum direction, the maximum discrepancy of this range between the mask and the obtained directivity was obtained.
Synthesis of volumetric ring antenna array for terrestrial coverage pattern
With this addition, Harman ensures access to innovative electro-acoustic and software-based directivity control technologies, with the AXYS products to become part of its professional audio product line.
Harman unveils buy of Duran Audio

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