Patent ID: 8695294

Claim:
A reinforced concrete partitioning structure to attenuate an electromagnetic wave having a target frequency which propagates from one space to the other space, comprising: a concrete portion having a thickness in a direction of the one space to the other space; and a reinforcing bar portion to form a reinforcing bar plane in lattice at a position in the thickness direction of the concrete portion, and including a plurality of first reinforcing bars and a plurality of second reinforcing bars to intersect the first reinforcing bars, the first and second reinforcing bars arranged with a fixed lattice spacing, wherein the lattice spacing of the first and second reinforcing bars are adjusted according to a wavelength or frequency of the electromagnetic wave having the target frequency; and the lattice spacing of the first and second reinforcing bars are set to a reference value with a predetermined permissible range of error according to a wavelength of the target frequency of the electromagnetic wave propagating through the concrete portion, wherein the reference value satisfies the following expression: the wavelength λ c =0.4685 P+ 30.937 where P is the lattice spacing of the first and second reinforcing bars, the predetermined permissible range of error being defined by an upper limit value expressed by λ c =0.5167P+28.816 and a lower limit value expressed by λ c =0.4267P+32.559.