| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna structure which is small in size and effectively transmits a measurement result without being affected by a radiowave absorber. Ž<P>SOLUTION: In an antenna portion 10 connected to a tag 10, a metallic reflection plate 22 is provided on the back of dielectrics 24, a linear antenna 26 of Peano curve or the like is formed on a front side, a power feeding terminal 30 is provided in an end portion of the linear antenna 26 and further, ground terminals 40, 40 are provided at a predetermined interval on both sides of the power feeding terminal 30. Thus, radiation characteristics can be obtained that, even with thickness where the antenna element 26 and the reflection plate 22 are proximate, capacity is maintained between the ground terminal 40, 40 and the power feeding terminal 30, impedance matching with a circuit side is achieved at an effective resonant frequency, and no influence is exerted from a radiowave absorber. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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