An omnidirectional antenna can be practically implemented but an
isotropic antenna cannot be implemented practically. An isotropic
antenna resembles an ideal antenna with ideal values for all
parameters.
An omnidirectional antenna can be practically implemented but an
isotropic antenna cannot be implemented practically. An isotropic
antenna resembles an ideal antenna with ideal values for all
parameters.
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omnidirectional, directional universal
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omnidirectional
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The power of the signal, as perceived by the receiver, will be lower with an omnidirectional antenna. This is because the omnidirectional antenna is transmitting in all directions, while the directional antenna is transmitting in only one direction.
Think of the directional antenna as a lens, focusing proportionally more power in a smaller space.
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The isotropicantenna by definition has a radiation pattern that
is a perfect sphere. The omni driectional antenna is characterized
by a radiation pattern resembling a doughnut.