The Quasi-Near Fields of Dipole Antennas

  • Bannister P
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The electric- and magnetic-field components produced by vertical and horizontal dipole antennas (both electric and magnetic types) located over, on, or below the surface of a semi-infinite conducting medium are derived and presented for the quasi-near range. (The measurement distance is much greater than an earth skin depth, but much less than a free-space wavelength.) Previously derived results are briefly summarized. The horizontal separation between the transmitting and the receiving dipole antennas is comparable to their heights. The derivations are the result of applying the quasi-near approximations to the basic Sommerfeld integrals and, in some cases, utilizing the reciprocity theorem. When is much greater than the antenna heights, the formulas for the field-component expressions reduce to previously derived results. It is observed that some of the field-component expressions are characterized by unusual height gain (or loss) functions. Some numerical values for these functions are provided.

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  • Peter R. Bannister

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