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- The directivity of an antenna relates to its radiation pattern. An antenna which radiates uniformly in all directions in three-dimensional space is called an isotropic antenna.
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An antenna that radiates equally in two, but not the third, direction is called omnidirectional [15]. For example, an omnidirectional antenna may radiate equally in all horizontal directions but not the vertical direction. Isotropic antennas have \ (D = 1\) while all other antennas have \ (D > 1\).
An isotropic antenna (isotropic radiator) is not a real antenna: It is a hypothetical, completely directionless antenna that radiates equal signal power in all vertical, horizontal, and transverse directions.
In radio communication, an omnidirectional antenna is a class of antenna which radiates equal radio power in all directions perpendicular to an axis (azimuthal directions), with power varying with angle to the axis (elevation angle), declining to zero on the axis.
An isotropic antenna (also known as an omnidirectional antenna) emits the signal uniformly in all directions. In other words, at distance d from the antenna, in any direction, the transmitted signal power is the same ( Figure 5.1 ).
Some antennas may also be described as "omnidirectional", which for an actual antenna means that the radiation pattern is isotropic in a single plane (as in Figure 1 above for the x-y plane, or the radiation pattern on the right in Figure 2).
Sep 16, 2024 · Ideally, an antenna which radiates energy in all directions equally i.e. an omnidirectional antenna is called as Isotropic Antenna. This is just a hypothetical situation and an isotropic antenna doesn’t exist in practice.
Oct 2, 2021 · An isotropic antenna is a theoretical antenna that radiates equally in all directions - horizontally and vertically with the same intensity. The antenna has a gain of 1 (0 dB) in the spherical space all around it and has an efficiency of 100%.
