Research Studies on Electromagnetic Radiation and Antennas.
HARVARD UNIV CAMBRIDGE MASS GORDON MCKAY LAB
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Researchers under the Contract have been concerned with two topics the cavity-backed slot antenna and the Beverage antenna. A complete quantitative understanding of the properties of the cavity-backed slot antenna was obtained in the form of extensive experimental data and an equivalent mathematical model. It is shown that the cavity-backed slot is not the complement of a strip dipole in the sense of Babinets principle as has been assumed incorrectly in some instances. An omnidirectional array consisting of cavity-backed slots and dipoles was studied theoretically and experimentally and its omnidirectional properties were demonstrated. Work on the horizontal wire antenna parallel to and close to a plane earth progressed. Measurements to determine the wave number for the antenna in its dependence on the properties of the earth and its height were carried out and compared with a new theory of the horizontal wire antenna. Extension of this theory to the terminated horizontal wire antenna Beverage antenna was made.
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