Accession Number:

AD0604644

Title:

RADIATION PATTERNS OF UNSYMMETRICALLY FED PROLATE SPHEROIDAL ANTENNAS,

Descriptive Note:

Corporate Author:

RAND CORP SANTA MONICA CALIF

Personal Author(s):

Report Date:

1955-08-18

Pagination or Media Count:

19.0

Abstract:

Maxwells equations are solved in prolate spheroidal PS coordinates subject to the boundary conditions. The PS functions are expressed in the form of power series and Laurent series. Radiation patterns were obtained for PS transmitting antennas of three different lengths up to about one wavelength long, for lengththickness ratios of about 51, 101, 221, and 3161, and for nine unsymmetrical gap locations as well as for the symmetricallyfed cases. It was found that the two most important factors affecting the radiation pattern of a fairly thin antenna were the location of the gap and the electrical length. For antennas less than a half wavelength long the pattern was the usual symmetrical figure eight and was essentially independent of the location of the gap except for magnitude changes due to the different gap impedances. For antennas two-thirds to three-quarters of a wavelength long the figure eight patterns could be bent in the direction of the longer element, and for antennas one wavelength long or longer minor lobes began to appear. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE