Accession Number:

AD0653851

Title:

HORIZONTAL VLF TRANSMITTING ANTENNAS NEAR THE EARTH

Descriptive Note:

Corporate Author:

NAVAL ORDNANCE LAB CORONA CA

Personal Author(s):

• Seeley, Elwin W.
• Wiborg, Philip H.

Report Date:

1967-05-15

Pagination or Media Count:

57.0

Abstract:

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.

Descriptors:

• *ANTENNAS
• ANTENNA RADIATION PATTERNS
• ATTENUATION
• DIPOLE ANTENNAS
• EFFICIENCY
• ELECTRICAL IMPEDANCE
• VERY LOW FREQUENCY

Subject Categories:

• Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE