JP2006128664A5 - - Google Patents

Claims (18)

A plurality of conductive patterns including one or a plurality of types of conductive patterns having a substantially polygonal outline shape in which at least one corner is curved, and a pattern layer formed in a manner in which the conductive patterns are not connected to each other;
A loss layer having a portion made of a material that is at least one of a magnetic loss material having a complex relative permeability (μ ′, μ ″) and a dielectric loss material having a complex relative permittivity (ε ′, ε ″). Composed of laminated ,
The curved corner is a dimension in which the frequency at which the peak of the absorption amount is constant and a small dimension regardless of the angular positional relationship of the conductive pattern with respect to the polarization direction as viewed in the incident direction of the electromagnetic wave. electromagnetic wave absorber according to claim Rukoto is. 2. The electromagnetic wave absorber according to claim 1 , wherein the outer shape is a shape formed by a combination of a straight line and a curved line . The electromagnetic wave absorber according to claim 1 , wherein the substantially polygonal shape has a shape in which four corners of a square are arcuate . The electromagnetic wave absorber according to claim 1 , wherein the conductive pattern is a planar pattern . The electromagnetic wave absorber according to any one of claims 1 to 4, wherein conductive patterns having different outer peripheral lengths are formed in combination. The electromagnetic wave absorber according to any one of claims 1 to 5, wherein conductive patterns having different curvature radii at corners are formed in combination . The electromagnetic wave absorber according to any one of claims 1 to 6 , wherein an interval between two adjacent conductive patterns varies depending on a position . The conductive pattern has one or a plurality of hole portions, and the hole portions have dimensions that resonate with respect to electromagnetic waves having a frequency to be absorbed. Electromagnetic wave absorber as described in one. The loss layer is
An electromagnetic wave absorbing layer made of a material that is at least one of a magnetic loss material and a dielectric loss material;
The electromagnetic wave absorber according to claim 1, further comprising a dielectric layer made of a dielectric material . The electromagnetic wave absorbing layer is composed of one or more materials selected from the group consisting of ferrite, iron alloy, and iron particles as a magnetic loss material in an amount of 1 to 1500 parts by weight with respect to 100 parts by weight of the organic polymer. The electromagnetic wave absorber according to claim 9, comprising: 11. The electromagnetic wave absorber according to claim 9 or 10, wherein the real part μ ′ of the complex relative permittivity of the dielectric layer is in the range of 1 to 50 . The electromagnetic wave absorber according to any one of claims 9 to 11 , wherein the electromagnetic wave absorption layer and the dielectric layer each have a surface resistivity of 10 ⁶ Ω / □ or more . The electromagnetic wave absorber according to any one of claims 9 to 12 , wherein a plurality of layers of at least one of the electromagnetic wave absorption layer and the dielectric layer are laminated . An electromagnetic wave absorber for absorbing electromagnetic waves in the 2.4 GHz band,
The electromagnetic wave absorber according to any one of claims 1 to 13 , wherein the total thickness is 4 mm or less. An electromagnetic wave absorber for absorbing electromagnetic waves in the 900 MHz band,
Electromagnetic wave absorber according to any one of claims 1 to 13, wherein the total thickness is 10mm or less. The electromagnetic wave absorber according to claim 1 , wherein the conductive reflective layer is laminated on the side opposite to the pattern layer with respect to the loss layer . The electromagnetic wave absorber according to any one of claims 1 to 16, wherein the electromagnetic wave absorber has flame retardancy or nonflammability. The electromagnetic wave absorption method by using the electromagnetic wave absorber as described in any one of Claims 1-17.