| 摘要 |
A small radio frequency IC tag which can obtain sufficiently long communication distance with radio wave in the microwave band even if an antenna is made small and the radio frequency IC tag is embedded in metal material is disclosed. An O-shaped antenna (1) is formed to narrow the width of a neck part (4) in which an IC chip (6) is mounted and widen the width of radiating electrodes (3a, 3b) constituting radiating part of radio wave. The radiating electrodes (3a, 3b) are formed into offset structure on right and left sides of the feeding point so that areas of right and left radiating parts of the feeding point in which the IC chip (6) is mounted are unsymmetrical. Further, a ground electrode (7) is provided so that a dielectric body (2) is held between the radiating electrodes (3a, 3b) and the ground electrode (7) and the radiating electrode (3b) is connected to the ground electrode (7) at the side of the dielectric body (2). |
