Patent ID: 7471233

Claim:
An electromagnetic wave absorber comprising: a first electromagnetic wave absorbent member containing a magnetic loss material, the first electromagnetic wave absorbent member being generally planar and having a plurality of base edges with respective base widths; and a second electromagnetic wave absorbent member containing an electrically conducting material, the second electromagnetic wave absorbent member being attached to and located on a first side of the first electromagnetic wave absorbent member, wherein the second electromagnetic wave absorbent member includes a plurality of planar members, each planar member having a bottom end edge, a tip end edge, and side edges extending between the bottom end edges and the tip end edges, the planar members being joined at the bottom end edges to the base edges of first electromagnetic wave absorbent member, each planar member being joined to two other planar members at respective side edges to form a hollow truncated pyramidal shape having an aperture at the tip end edges of the planar members, opposite the first electromagnetic wave absorbent member, the aperture providing access for electromagnetic waves into the hollow truncated pyramidal shape, the tip end edges having respective tip end widths, and ratio of the tip end widths to the base widths is in a range from 0.25 to 0.75 wherein the absorber is configured to absorb electromagnetic waves in a frequency range from 30 MHz to 100 MHz.