Patent ID: 7274953

Claim:
A portable telephone including a mouthpiece portion, an earpiece portion and an antenna, the mouthpiece portion and the earpiece portion inputting and outputting sounds for communication, the antenna emitting electromagnetic wave for communication, the portable telephone comprising: a sheet-type dielectrics provided in a position apart from the antenna, the dielectrics having the thickness of 1 mm or smaller, and the dielectrics having the relative dielectric constant ε r that is defined as (ε r ′−jε r ″), the combination of the real part ε r ′ and the imaginary part ε r ″ being outside of the characteristic line K shown in FIG. 4 , and the imaginary part ε r ″ being equal to or more than one, wherein said sheet-type dielectrics includes a base material and an additive containing graphite fiber.