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HORIZONTAL VLF TRANSMITTING ANTENNAS NEAR THE EARTH
NAVAL ORDNANCE LAB CORONA CA
Pagination or Media Count:
Problems encountered in VLF radiation are outlined and variations of the horizontal dipole are proposed as a solution. Equations are derived for the radiation patterns, input impedance, and efficiency of the broad-band antenna terminated in its characteristic impedance and of the narrow-band antenna open-terminated where the antenna is fed at any position along its length. Data are presented to substantiate that 1 the horizontal dipole near the earth exhibits super gain when several parallel conductors are used 2 the radiation efficiency of n closely spaced conductors is n times greater than when the same conductors are spaced one-half wavelength apart and 3 the lossy horizontal dipole normally does not resonate when its length is a multiple of one-half wavelength. The lossy lengthening factor is shown in a plot of the resonant length as a function of Q. This plot applies generally to all lossy dipoles.
APPROVED FOR PUBLIC RELEASE