Patent ID: 8564472

Claim:
A sheet member for improving communication used when performing wireless communication using an antenna element in a vicinity of a member configured to jam communication having a portion made of a conductive material, the sheet member being between the antenna element and the member, and comprising: a pattern layer including a conductive pattern portion, the pattern layer configured to resonate with electromagnetic waves, to store electromagnetic energy, to electromagnetically couple with the antenna element, and to transfer the stored electromagnetic energy to the antenna element; and a storage layer between the pattern layer and the member, the storage layer being a low loss material and at least one of a non-conductive dielectric layer and magnetic layer, the storage layer configured to propagate the electromagnetic waves with low loss and to store energy of the electromagnetic waves, wherein the low loss material has a loss tangent ∈″/∈′ that is 0.25 or below and a magnetic loss tangent μ″/μ′ that is 0.3846 or below, ∈′ and ∈″ being real and imaginary parts of a complex relative dielectric constant of the low loss material, respectively, and μ′ and μ″ being real and imaginary parts of a complex relative magnetic permeability of the low loss material, respectively.