| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve a sufficient communication distance even though an antenna is installed on the surface of a metal material in close contact. <P>SOLUTION: A radiation plate 11 of length a1 and width b1 and a ground plate 12 of length a2 and width 2 are stacked vertically in parallel, the radiation plate 11 is connected to one of antenna terminals 13a and 13a of an IC chip 13 satisfying the length a1=(0. 2 to 0. 27)λ with respect to wavelength λ of a radio wave for communication of the IC chip 13, and the ground plate 12 is connected to the other of the antenna terminals 13a and 13a of the IC chip 13 satisfying the length a2>a1 and the width b2>b1. <P>COPYRIGHT: (C)2008,JPO&INPIT |
