| 摘要 |
Combination of three half-wave dipole antennas A1-A3 spaced uniformly in one plane and arranged concentrically with a fourth antenna A4 situated the same distance from each of the three half-wave antennas and in a plane perpendicular to them so as to form an array of antennas fed with currents of like phase and of like amplitude, the diameter of the circle containing the radiating elements of the three half-wave antennas being equal to a half-wave length lambda 0 in air at the mean working frequency, this dimension being reducible by the dielectric constant epsilon r when the set of antennas is embedded in a homogeneous dielectric medium. Application to ground-to-ground or ground-to-air all-round azimuthal transmissions in a disturbed surrounding medium. <IMAGE>
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