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法向模螺旋天线单圈螺旋的直径远小于工作波长,它在垂直于螺旋轴的方向上辐射最大,电磁波沿轴向的传播相速比一般线天线的要小,相应的导波长λ_0小于工作波长λ_0.这种天线是对导波长谐振的,谐振时可以减小天线的几何尺寸,所以这种天线是一种慢波结构的螺旋天线.近年来,开始在移动通信、电视接收等方面获得应用.
The diameter of the unidirectional spiral of the normal-mode helical antenna is much smaller than the working wavelength, and it radiates most in a direction perpendicular to the helical axis. The propagation speed of the electromagnetic wave in the axial direction is smaller than that of a general-purpose antenna, and the corresponding guided wavelength λ_0 is smaller than the working wavelength Wavelength λ_0. This antenna is guided wavelength resonance, resonance can reduce the antenna geometry, so this antenna is a slow-wave structure of the helical antenna. In recent years, began to receive mobile communications, television and so on application.