一种全向圆柱共形螺旋阵列天线

A type of omnidirectional cylindrical conformal helical array antenna

基于圆柱共形阵列天线的基本理论,提出了一种螺旋圆柱阵列天线,该阵列由两层沿圆柱外壁交错排列的螺旋单元组成,采用矩量法分析了天线的辐射特性。通过优化螺旋单元的个数及分布,得到最优的单层单元数N=18,层间距H=60 mm,使阵列天线在实现高增益的同时,在θ=90°平面上产生360度全向辐射,最大增益Gmax可达7.5 dBi,不圆度C<1.6 dB。

A type of helical array antenna was presented based on the basic theory of cylindrical conformal antenna array, which was consisted of two layers helical antenna stagger arranged along the cylindrical outer wall. The radiation characteristic of the antenna array was analyzed using the method of moments （MOM）. The best number of the unit in single layer N=18, the inter lamellar space H = 60 mm, which are get by optimizing number and position of the helical unit, so that the antenna array can radiate an 360° ommidirectional pattern normal at θ = 90° plane when the antenna array also can reach high gain more than 7.5 dBi of peak gain, the less than 1.6 dB of out-of-roundness and the angle of pitch is 26°.