Development of VHF-band antenna mounted on the helmet

Recently, the VHF band attracts attention for mobile use. For example, around 150 MHz is used in fire fighting and police radio et al. The microwave in VHF-band is especially useful for the communication network construction under the environment with a lot of obstacles. However, a present transceiver's antenna that sticks out long has the possibility to obstruct the user's activity. To solve this problem, we decided to use wearable antenna. In this paper, we propose the inverted-L antenna mounted on a helmet as a wearable antenna.