短螺旋-圆锥喇叭天线设计与分析

Design and analysis of short helicone antenna

分析设计了一种适用于高功率阵列天线辐射单元的短螺旋-圆锥喇叭天线。数值模拟分析了不同单元间距下的短螺旋-圆锥喇叭天线的互耦大小,并与短螺旋天线的互耦大小进行比较,结果表明:当单元间距等于0.9λ时,短螺旋-圆锥喇叭天线的互耦与短螺旋天线相当;当单元间距小于0.9λ时,短螺旋-圆锥喇叭天线的互耦比短螺旋天线略大;而当单元间距大于0.9λ时,短螺旋-圆锥喇叭天线的互耦较短螺旋天线小。在此基础上,设计了口径大小为1λ、可用于阵列天线组阵的短螺旋-圆锥喇叭天线。该天线的方向性系数与同等口面下的短螺旋天线相比提高了1dB,副瓣电平降低了约7dB,互耦系数降低了约3dB,一定程度地减小了单元之间的互耦。

A novel short helicone antenna is proposed in this paper which can be used as a cell of HPM array antenna.Mutual coupling of two short helicone antennas at different distances is simulated using the numerical simulation software.By comparing with mutual coupling of two short helical antennas in the same situation,restriction to be followed is that： when the cell distance is equal to 0.9λ,mutual coupling of the short helicone antenna corresponded to the short helical antenna;when the cell distance is smaller than 0.9λ,mutual coupling of the short helicone antenna is bigger than the short helical antenna;when the cell distance is larger than 0.9λ,mutual coupling of the short helicone antenna is smaller than the short helical antenna.Based on the restriction condition,a short helicone antenna is designed.At the centre frequency,the directivity of this antenna is increased by 1 dB,the sidelobe is 7 dB lower than that of the short helical antenna.The mutual coupling between two short helicone antennas is 3 dB smaller than that of two short helical antennas in the same situation.