| 摘要 |
<p>PURPOSE: A dipole antenna for a safe helmet is provided to install the antenna under an external cap of the helmet while having an amnidirectional and wide operation range. CONSTITUTION: Two conductive branches (3) are arranged to be electrically connected with each wireless device. The conductive branches are arranged in parallel. The conductive branches have the same length as 1/4 of an expected operating wavelength. Two conductive arms (8) have the same length as 1/2 of the expected operating wavelength. Each of conductive arms is connected with each free terminal of the conductive branches.</p> |
