Unipole

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Unipole

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A hypothetical antenna radiating or receiving equally in all directions. Also called isotropic antenna. </dd>
A pulsating sphere is a unipole for sound waves. In the case of electromagnetic waves unipoles do not exist physically but represent convenient reference antennas for expressing directive properties of actual antennas. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use