Obstacle-type artificial dielectrics for microwaves
- 1 January 1952
- journal article
- Published by Institution of Engineering and Technology (IET) in Journal of the British Institution of Radio Engineers
- Vol. 12 (1) , 49-60
- https://doi.org/10.1049/jbire.1952.0005
Abstract
Artificial dielectrics consisting of arrays of small metallic elements have found widespread employ ment recently, notably in the construction of microwave lens aqtenn Depending on the shape of the obstacles, these media may be conveniently analyzed (1) by an analogy with classical molecular theory, (2) by a consideration of scattering phenomena, or (3) by an analogy with transmission-line theory. A great deal of experimental information is also becoming available.A survey of the analytical and practical techniques now used in the design of artificial dielectrics is presented. Special emphasis is given to a consideration of the similarities and dissimilarities between the behaviour of such media and that of actual dielectrics. The case for artificial dielectrics is discussed in terms of their various advantages over actual dielectrics, such as light weight, good matching properties, and the feasibility of spatial variation of refractive index for Lüneburg-lens and other applications.Keywords
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