Abstract
In this paper a new class of helmet antennas with omnidirectional pattern has been developed. Its radiation performance is considerably superior to that of conventional resonant whip antennas for terrestrial field applications over a much wider bandwidth and with more stable connectivity regardless of the wearer's body movement and orientation. In addition, the helmet antenna has other practical advantages over the whip antenna. Thus, this helmet antenna appears to be a viable solution for many real-world applications.
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