Patent ID: 7190326

Claim:
An article having a communication window comprising: a substrate having a major surface, the major surface having a portion to block out at least one predetermined wavelength of an electromagnetic spectrum and a portion of the major surface outlined by an imaginary boundary defined as an aperture, the aperture having a frequency selective surface pattern defined by an area that passes the at least one predetermined wavelength of the electromagnetic spectrum, defined as a passing area, and an 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 columns, each column defined by a first boundary line spaced from a second boundary line and having a plurality of blocking areas between the first and second boundary lines of the column, the blocking areas spaced from one another by a passing area, and the column having a first at least one passing area between the blocking areas and the first boundary, and a second at least one passing area between the blocking areas and the second boundary, and each of the columns separated by a blocking area.