Patent Number: 
Section: claims

1. An electromagnetic wave suppression sheet comprising metallic magnetic particles mixed into a resin and formed into a sheet shape, wherein the electromagnetic wave suppression sheet has a coercive force of 320 A/m or more and a saturation magnetization of 0.35 Wb/m2 or more at a time when an external magnetic field of 1 kOe in an in-plane direction is applied. 2. The electromagnetic wave suppression sheet of claim 1, having a value of (the saturation magnetization at the time when the external magnetic field is applied)/(the coercive force) within a range of 0.0006 to 0.0016 (Wb/m2)/(A/m). 3. The electromagnetic wave suppression sheet of claim 1, wherein the metallic magnetic particle has one of a flat shape and a spherical shape. 4. The electromagnetic wave suppression sheet of claim 1, having an imaginary part of a relative magnetic permeability of 3 or more at 5 GHz. 5. The electromagnetic wave suppression sheet of claim 1, wherein the metallic magnetic particle is made of at least one metallic magnetic material selected from a group consisting of Fe, Co, a Fe—Al—Si-based alloy, a Fe—Si—Cr-based alloy, a Fe—Si-based alloy, a Fe—Ni-based alloy, a Fe—Co-based alloy, a Fe—Co—Ni-based alloy, and a Fe—Cr-based alloy. 6. The electromagnetic wave suppression sheet of claim 1, wherein the resin has particles of a conductive material mixed therein in addition to the metallic magnetic particles. 7. The electromagnetic wave suppression sheet of claim 1, wherein a layer in which the metallic magnetic particles are mixed into the resin and a layer in which a conductive material is mixed into a resin are layered. 8. The electromagnetic wave suppression sheet of claim 1, having a coercive force of 450 A/m or more and a saturation magnetization of 0.5 Wb/m2 or more at a time when an external magnetic field of 1 kOe in an in-plane direction is applied. 9. The electromagnetic wave suppression sheet of claim 1, having a value of (the saturation magnetization at the time when the external magnetic field is applied)/(the coercive force) within a range of 0.0009 to 0.0013 (Wb/m2)/(A/m). 10. The electromagnetic wave suppression sheet of claim 1, having an imaginary part of a relative magnetic permeability of 5 or more at 5 GHz. 11. A device, comprising:an integrated circuit element package; andan electromagnetic wave suppression sheet comprising metallic magnetic particles mixed into a resin and formed into a sheet shape, the electromagnetic wave suppression sheet having a coercive force of 320 A/m or more and a saturation magnetization is of 0.35 Wb/m2 or more at a time when an external magnetic field of 1 kOe in an in-plane direction is applied, the electromagnetic wave suppression sheet being bonded to the package of the integrated circuit element. 12. The device of claim 11, wherein the electromagnetic wave suppression sheet has a coercive force of 450 A/m or more and a saturation magnetization of 0.5 Wb/m2 or more at a time when an external magnetic field of 1 kOe in an in-plane direction is applied. 13. The device of claim 11, wherein the electromagnetic wave suppression sheet has a value of (the saturation magnetization at the time when the external magnetic field is applied)/(the coercive force) within a range of 0.0009 to 0.0013 (Wb/m2)/(A/m). 14. The device of claim 11, wherein the electromagnetic wave suppression sheet has an imaginary part of a relative magnetic permeability of 5 or more at 5 GHz. 15. An apparatus, comprising:an integrated circuit element;a wiring; andan electromagnetic wave suppression sheet comprising metallic magnetic particles mixed into a resin and formed into a sheet shape, the electromagnetic wave suppression sheet having a coercive force of 320 A/m or more and a saturation magnetization of 0.35 Wb/m2 or more at a time when an external magnetic field of 1 kOe in an in-plane direction is applied, the electromagnetic wave suppression sheet being disposed in a vicinity of one of the integrated circuit element and the wiring. 16. The apparatus of claim 15, wherein the electromagnetic wave suppression sheet has a coercive force of 450 A/m or more and a saturation magnetization of 0.5 Wb/m2 or more at a time when an external magnetic field of 1 kOe in an in-plane direction is applied. 17. The apparatus of claim 15, wherein the electromagnetic wave suppression sheet has a value of (the saturation magnetization at the time when the external magnetic field is applied)/(the coercive force) within a range of 0.0009 to 0.0013 (Wb/m2)/(A/m). 18. The apparatus of claim 15, wherein the electromagnetic wave suppression sheet has an imaginary part of a relative magnetic permeability of 5 or more at 5 GHz.