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 e2

See also gain.

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.
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.
Directivity patterns showed that for the simple planar speaker, directivity index increases as frequency increases.
A square patch antenna is designed such that the shape of the rectangular patch is modified in order to improve the directivity keeping the physical volume of the antenna constant.
The term "directivity pulse" usually refers to "forward directivity pulses", which are more critical to engineered structures (Cox and Ashford, 2002).
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.
For different observation distance, the directivity of SPLs at the BPF and 2BPF are shown in Figures 14 and 15, respectively.
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.
However, the study lacked major design parameters like gain, directivity and h-field which are required to claim a better antenna design.
Increasing directivity decreases the impact of ISI effect.
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.
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.
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.

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