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The use of emulsions to represent dielectric materials in electromagnetic scale models

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2 Author(s)
G. S. Smith ; Sch. of Electr. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; W. R. Scott

Simple emulsions are examined as materials with adjustable electrical constitutive parameters. These emulsions are mixtures of oil, saline solution, and a suitable stabilizing agent (emulsifier). Since the relative permittivities of oil and water are around two and eighty, respectively, a large range of permittivity can be obtained for the emulsions. The conductivity of the emulsions can be adjusted by changing the normality of the saline solution. A series of oil-in-water emulsions (oil droplets in water), suitable for use in scale models, is developed; this includes the selection of an appropriate emulsifier. The electrical constitutive parameters of these emulsions are adjustable over wide ranges, and are predictable from a simple formula. As an example, an emulsion that is a scale model for red-clay earth is described

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:38 ,  Issue: 3 )