基于矩形波导缝隙馈电的阵列天线设计

Design of array antenna based on slots coupling of rectangular wave-guide

提出一种具有高功率容量的直线阵列天线,该天线阵基于矩形波导缝隙馈电,馈电耦合结构采用新型的弧形耦合缝隙,利用小螺旋天线作为辐射单元,通过旋转螺旋线内导体来调整各个辐射单元相位,从而实现一维波束扫描。采用等效传输法进行理论设计,数值模拟结果表明,该长度为3200mm的单元天线在中心频率8.40GHz上可获得的增益为27.50dB,主瓣轴比为0.51dB。功率容量约90 MW,辐射效率为97.10%,反射低于-24dB,波束扫描范围±38°。

A linear array antenna with high power-handling capacity is designed in this article,which is feed through slots of rectangle wave-guide.A new cambered slot coupling structure is applied in the antenna,which radiation element is a small antenna,and one dimension beam scanning is realized by rotating the inner conductor of the helical line to adjust the phase of the radiation element.The theoretical design is accomplished according to the equivalent transmission theory,the simulation results indicate that:one 3200.00 mm long array antenna has the gain of 27.50 dB at the frequency of 8.40 GHz,and the axial ratio is 0.51 dB.The power-capacity is about 90 MW,and the efficiency of the antenna is 97.10%.The reflectance is below-24 dB,and the beam scanning is±38°.