The nature of the field in the neighbourhood of an antenna

Wilmotte, Raymond M.

doi:10.1049/jiee-1.1928.0111

Cited by 2 publications

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“…The three terms in (11) give rise to three separate components of the field, which will be denoted by the subscripts 1, 2, and 3, so that (11) may be abbreviated as n 0 = Π! +Π 2 +Π 3 .…”

Section: The Nature Of the Field Above A Finitely Conducting Planementioning

confidence: 99%

“…A completion of our knowledge of this function requires the evaluation of Z 3 , which will now be undertaken. Z 3 is zero for infinite conductivity and becomes larger as the conductivity decreases, due to the exponential factor e~a ss in (11). The last integral of (13) must be evaluated to determine the exact way in which Z 3 changes with conductivity and antenna height, which in turn will require an evaluation of Π 3 .…”

Section: The Effect Of a Finite Earth Conductivity On The Impedancementioning

confidence: 99%

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On the impedance of a vertical half-wave antenna above an earth of finite conductivity

Barrow

1935

Proc. Inst. Radio Eng.

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The complex impedance of a vertical half-wave antenna located any distance above an earth of given conductivity and dielectric constant is calculated by the ^induced electromotive force" method. Based on the assumption k 0 <£i\ k\ (where k 0 and k are the wave numbers for the atmosphere and earth, respectively), the results are applicable down to about 10 meters for any earth except a very dry soil. The calculation is based on the Sommerfeld-von Hoerschlemann expression for the field of a dipole above a half space of arbitrary electrical character. After splitting the total impedance into three parts, Z = Ζ λ +Ζ 2 +Ζ Ζ , the component Z\ is shown to be the self-impedance of the antenna, Z 2 the mutual impedance between the antenna and its perfect image, and Z 3 an impedance component due to the finite conductivity of the earth. Z z is found to be proportional to two factors, one of which depends on the conductivity and dielectric coefficient of the earth and the wavelength and the other of which depends only on the ratio h/λ, where h = antenna height and λ = wavelength. Z 3 is put in a form suitable for the computation of any given case and curves are shown for four typical examples. For λ>10 meters and all except very dry soil, the effect of the finite conductivity is quite small and the assumption, often made, of a perfectly reflecting earth thus is justified for a large number of cases. The impedance is, except for very short waves or exceedingly dry soil, substantially that obtained for a perfectly conducting earth. A principle of similitude is stated, in which two antennas over the same kind of earth and having equal values of h/\ have identical impedances.

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Section: The Nature Of the Field Above A Finitely Conducting Planementioning

confidence: 99%

Section: The Effect Of a Finite Earth Conductivity On The Impedancementioning

confidence: 99%

On the impedance of a vertical half-wave antenna above an earth of finite conductivity

Barrow

1935

Proc. Inst. Radio Eng.

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Monthly list of references to current radio literature

1928

Proc. Inst. Radio Eng.

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The nature of the field in the neighbourhood of an antenna

Cited by 2 publications

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On the impedance of a vertical half-wave antenna above an earth of finite conductivity

On the impedance of a vertical half-wave antenna above an earth of finite conductivity

Monthly list of references to current radio literature

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