AN EXPERIMENTAL STUDY OF PLASMA-COVERED SLOTS ON CYLINDERS AND CONES.
Physical sciences research papers no. 314,
AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS
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The effect of a plasma on the radiation characteristics of slot and gap apertures located on structures such as cylinders and cones has been studied by means of a plasma simulation technique. The relative index of refraction of less than unity between plasma and free space was maintained for the model by an analog tank that represented free space by a high dielectric constant liquid and the plasma by a lower dielectric material. This technique differs from a previous simulation method in that the models can be immersed into the tank, rather than being kept external. This modification allows the study of nonplanar geometries of complex shapes. Antenna patterns of axial slots on cylinders of various radii and thicknesses of plasma covering were observed to have good agreement with theory for radiation in the equatorial plane, as did the antenna patterns for a plasma-covered center-fed cylindrical antenna. Experimental patterns of a slot on a cylinder partially covered by a plasma are presented. Various effects of the plasma on the radiation characteristics of the slot were observed by varying the location of the plasma on the cylinder in relation to the slot and by varying the amount of surface area covered by the plasma. Experimental patterns of slots on cones covered by a plasma are also presented. Author
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