Letters to the Editor

The question: "How does a dipole receive?" The core of this question appears to lie in a comparison of the physical area of a dipole and its capture area. For example, assume a dipole antenna one meter long and 10 mm in diameter, oriented toward the E vector of the incoming wave. The physi...

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Bibliographic Details
Published in:IEEE antennas & propagation magazine 2008-06, Vol.50 (3), p.159-160
Main Author: Haviland, R. P.
Format: Magazinearticle
Language:English
Online Access:Get full text
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Summary:The question: "How does a dipole receive?" The core of this question appears to lie in a comparison of the physical area of a dipole and its capture area. For example, assume a dipole antenna one meter long and 10 mm in diameter, oriented toward the E vector of the incoming wave. The physical cross section normal to the incoming wave is 0.01 m 2 . The resonant frequency will be close to 2 m, 150 MHz. From the relation, the effective aperture is 0.13 times the wavelength squared, about 0.52 m 2 . Thus, the antenna is capturing energy from an area some 50 times as great as the physical area of the antenna.
ISSN:1045-9243
1558-4143
DOI:10.1109/MAP.2008.4563598