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Virtually-Pure Horizontal Polarization

December 21st Fact-of-the-Day

Some applications, such as certain types of radio navigational aids, require antennas that radiate virtually-pure horizontally-polarized waves. A vertical magnetic dipole that is shaped, sized and fed such that current of nearly uniform phase is distributed almost uniformly around it radiates waves that are almost purely horizontally-polarized. Unfortunately, magnetic dipoles that meet that requirement tend to be too small to be efficient radiators, so sometimes several such dipoles are clustered together and fed in phase to achieve higher efficiency. ©2004 Martek International All rights reserved.


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