Patent ID: 6891517

Claim:
An article having a communication window comprising: a substrate having a major surface, the major surface having a first portion to block out at least one predetermined wavelength of an electromagnetic spectrum and a second portion outlined by an imaginary boundary defined as an aperture, a frequency selective surface pattern within the aperture, the pattern defined by arrangement of at least one area that passes the at least one predetermined wavelength of the electromagnetic spectrum, defined as a passing area, and at least one area that blocks out the at least one predetermined wavelength of the electromagnetic spectrum, defined as a blocking area, wherein the frequency selective surface pattern comprises: a plurality of spaced arcuate break lines each break line having at least one passing area and at least one of the break lines having a different curvature than another one of the break lines, the break lines nested within one another with the break line having the largest curvature as the outermost break line of the plurality of break lines and the break line having the smallest curvature as the innermost break line of the plurality of arcuate break lines, wherein the plurality of break lines are arranged by decreasing curvature in a direction away from the outermost break line toward the innermost break line; and an area between adjacent arcuate break lines of the plurality of arcuate break lines forming the blocking area.