| 摘要 |
The present invention provides a dual-band antenna that can be operated at two frequencies without providing the choke coil. A first element 11 operated in a high-frequency-side band is formed in a surface of a print board 10 using a print pattern. A second element operated in a low-frequency-side band is formed in an upper portion of a rear surface of the print board 10 so as not to overlap the first element 11. A power is fed to the first element 11 from a power feeding point 13 located at a lower end of the print board 10, and the power is fed to the second element 21 through a throughhole 12 made in a middle of the first element 11. The power is fed to the second element 21 from the throughhole 12 through a long and thin power feeding line, and the power feeding line exhibits a high impedance to a high frequency. A slit 11a is formed in the first element 11 corresponding to the power feeding line. |
