THEORY OF GRADED RADAR ABSORBER MATERIALS.
Interim engineering rept.,
THOMAS (A S) INC WESTWOOD MASS
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Expressions for the effective dielectric constant and magnetic permeability of an artificial dielectric consisting of a rectangular array of infinitely-long circular rods are derived in terms of the spatial and electrical characteristics of the rods and the surrounding medium. The mean electromagnetic field in the dielectric, from which the effective dielectric constant and permeability can be deduced, is determined for the near field case. Thus, the results apply for closely-packed thin rods. The effective dielectric constant and magnetic permeability are given in terms of the rod diameter, rod spacing, dielectric constants and magnetic permeabilities of the rods and surrounding medium, and the wave length of the incident wave. Author