| 摘要 |
To obtain a two-dimensional periodic structure and a manufacturing method therefor, enabling application to the shielding of signals in the microwave band and to a functional element, and miniaturization thereof, and to obtain a radio wave shield obtained therefrom and being not detected by a metal detector. ! The electromagnetic wave shield includes a two-dimensional periodic structure portion (D), in which a portion (A) of a high dielectric constant having relative permittivity epsiA of 100-10,000 and a portion (B) of a low dielectric constant having relative permittivity epsiB of 1-20 are distributed in a two-dimensional plane, with periodicity in the range of 0.5-25.0 mm. When an electromagnetic wave of 1.4-3.4 GHz passes through the two-dimensional plane, the electromagnetic wave shield shows transmission attenuation of >=10 dB in the frequency range concerned. ! (C)2011,JPO&INPIT |
