Development of wearable antenna for VHF-band

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.