2 ) to
the prolate one typical for a one-layer plasma coating. If there is no
coating, the maximum radiation field would be at a slot antenna of a
spherical shape.[50] Thus the plasma coating of a dipole antenna at fixed current at its clamps (or of a slot antenna at fixed voltage at its gap) at some frequencies promote a considerable increase of the field in vacuum and an increase of Re Z in ( Re Y in for a slot antenna) and leads to a relative decrease in Im Z in ( Im Y in ), the latter fact making easier the coordination of the generator to the load. The resonant value of the field exceeds almost by 3 orders of magnitude the field of the antenna without a coating.
[51] The shape of the spheroidal slot antenna with a two-layer plasma
coating providing the maximum resonant impact on the radiation field
depends on the thickness of the first layer. With a decrease of the first
layer thickness, this shape changes from the oblate one
( a/b 2 ) to
the prolate one typical for a one-layer plasma coating. If there is no
coating, the maximum radiation field would be at a slot antenna of a
spherical shape.
[52] It is shown that use of a plasma coating of a dipole or slot ground-based antenna under some conditions is able to improve the coordination of the generator to the load and to lead to an increase of the low-frequency field at the Earth's surface. That would increase the reliability of the information on the deep layers of the Earth.
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