A helix antenna was presented together with low power RF amplifier, as the frequency fitted, the axial direction can obtain largest radio energy.

采用小尺寸低功耗的射频芯片结合实际环境设计出螺旋结构天线，选择合适的频率，天线在轴向方向得到最大的辐射能量。

youdao

An active receiving antenna consisting of conical helix antenna and a negative impedance changing circuit is analyzed in this paper.

对用负阻抗变换电路同圆锥螺旋天线相结合，构成的有源接收天线进行了理论分析。

youdao

The GD300 uses a quadra-helix antenna for real-time global positioning that defies interference even when the user is positioned in mountainous regions or urban environments.

ENGADGET: General Dynamics' GD300 is the Pip-Boy that runs Android