| 摘要 |
PROBLEM TO BE SOLVED: To provide a substantially linear dipole antenna for safety helmet.SOLUTION: The linear dipole antenna 100 for safety helmet comprises two conductive branches 3 each having one end for electrical connection with each wireless device, and a length substantially equal to 1/4 of the expected effective wavelength of the wireless device. The dipole antenna 100 further includes at least two conductive arms 8 each having a length substantially equal to 1/2 of the effective wavelength, and connected electrically with the free end of the conductive branch 3 via a choke 10. |
