NEC4 Analysis of a Navy VLF Antenna
NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
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This paper describes the NEC4 analysis used to evaluate proposed modifications to a Navy VLF top-loaded monopole. Charge densities are computed and used to calculate the maximum top-load gradient for two wire sizes. Although the antenna is electrically small, a large number of segments is needed to obtain the desired resolution in the charge data. Gradient values derived from the NEC4 data are shown to be in close agreement with those derived from measured data. The gradient values show that the proposed configuration does not meet the maximum gradient design limit for this antenna. Antennas, Measurement, Communications, Very low frequency, Low frequency, High voltage.
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