| 摘要 |
Provided is a radio-frequency antenna with which the blocking or weakening of a radio-frequency induction electric field will not occur even if a thin-film material deposits on the antenna surface. A radio-frequency antenna 10 includes a linear antenna conductor 13, a dielectric protective pipe 14 provided around the antenna conductor 13, and a deposit shield 15 provided around the protective pipe 14, the deposit shield 15 covering at least one portion of the protective pipe 14 and having at least one opening 153 on any line extending along the length of the antenna conductor 13. Although the thin-film material adheres to the surfaces of the protective pipe and the deposit shield, the deposited substance has at least one discontinuous portion in the longitudinal direction of the antenna conductor. Therefore, in the case where the thin-film material is electrically conductive, the blocking of the radio-frequency induction electric field is prevented. In the case where the thin-film material is not electrically conductive, an attenuation in the intensity of the radio-frequency induction electric field is suppressed. |
