Patent ID: 7911407
Filing Date: 2011-03-22
Classification: H01Q

Abstract:
1. A method for creating an artificial impedance surface characterized by an impedance tensor, comprising: selecting a desired far-field pattern for a surface; determining design impedance values as a function of location on the surface that would produce the desired far-field pattern; selecting a patterning shape for the surface, the patterning shape having at least one geometric characteristic; and measuring sample tensor impedance component values for a plurality of test surfaces that have test patterning shapes that have varied measurements for the at least one geometric characteristic; for each location on the surface, (i) determining what values of the at least one geometric characteristic would give impedance values that most closely approximate the design impedance values for that location and (ii) patterning the surface to include a unit cell with the patterning shape modified to have said at least one geometric characteristic would give impedance values that most closely approximate the design impedance values for that location.