Accession Number:

AD0676070

Title:

A THEORETICAL STUDY OF A CYLINDRICAL ANTENNA WITH A HEMISPHERICAL CAP,

Descriptive Note:

Corporate Author:

HARVARD UNIV CAMBRIDGE MASS CRUFT LAB

Personal Author(s):

Report Date:

1968-06-01

Pagination or Media Count:

27.0

Abstract:

The integral equation of a cylindrical monopole antenna with a hemispherical cap driven by a coaxial line is formulated and solved by two approximations. First, the current on the cap is approximated by a sinusoidal distribution. Secondly, the field across the driven gap is approximated by the fundamental TEM coaxial-line mode. Results are compared with the tubular model. It is shown that the input admittance curve of the capped antenna has the same shape as that of the tubular antenna with open ends but is shifted. The radiation patterns of the two antennas are essentially the same. The capped antenna is approximately equivalent to the tubular antenna with length 0.25 radius shorter than the total axial length of the antenna with a cap. Author

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE