Patent ID: 7804439

Claim:
An electromagnetic wave absorber, comprising: an element receiving layer provided with a first type and a second type of conductor elements having resonant frequencies, to perform the same or different receiving operations, each of the element receiving layer conductor elements being disposed on a surface of the element receiving layer on a side from an incoming direction of electromagnetic waves, to be spaced away from each other; and a loss material for causing energy loss to electromagnetic waves proximate to the element receiving layer, wherein the first type of the conductor elements are cross conductor elements that are cross-shaped planes, and the second type of the conductor elements are quadrangular conductor elements that are quadrangle-shaped planes, the cross conductor elements and the quadrangular conductor elements are arranged in a direction intersecting the incoming direction of electromagnetic waves, the cross conductor elements are arranged in a regular manner, the quadrangular conductor elements are arranged in areas surrounded by the cross conductor elements so as to fill in the areas, each corner of the quadrangular conductor elements is arc shaped, the arc shape having a radius of curvature corresponding to the resonant frequencies, and at least each concave corner of the cross conductor elements is arc shaped, the arc shape having a radius of curvature corresponding to the resonant frequencies.