基于共面波导的全角度频率波束扫描天线

Full-angle frequency beam scanning antenna based on the coplanar waveguide

为满足平面集成系统、雷达等领域对宽角度频率波束扫描天线的需求,提出了一种低剖面、小型化、全角度频扫天线的设计方案.天线通过在共面波导上刻蚀周期性孔阵列,形成人工表面等离子体激元结构,利用其高次模辐射的特性产生频率扫描波束.通过在共面波导一侧金属地上刻蚀周期性的梳状结构,并由共面波导为其馈电,产生低频反向端射波.仿真结果表明,天线在9.1~53 GHz频带内平均增益为12.75 dBi,频率波束扫描范围为180°.由于矢量网络分析仪频率量程限制,实测结果在9.1~40 GHz与仿真结果具有较好的一致性.该天线具有加工易、剖面低、成本低、全角度扫描的特点,为平面集成系统、雷达等领域宽角度频扫天线提供了一种新的设计思路.

In order to meet the requirements of wide-angle frequency beam scanning antenna in planar-integrated communication and radar field,a design method for low-profile,miniaturized,full-angle frequency beam scanning antenna is proposed.The antenna is constructed by hole arrays etched on the coplanar waveguide,which forms spoof surface plasmon polariton structure and the frequency beam scanning wave is generated by using its high-order radiation modes.The periodic comb structures are etched on the one side of the coplanar waveguide metal ground,which fed by coplanar waveguide and generated the low frequency reverse end-fire waves.The simulated results show that,within 9.1−53 GHz,the frequency beam scanning angle of the antenna can cover 180°with an average gain level of 12.75 dBi.Due to the limitation of frequency range of vector network analyzer,the measured results within 9.1−40 GHz are in good agreement with the simulation ones.The antenna has the characteristics of easy fabrication,low profile,low cost and full frequency scanning angle,which provides a new idea for wide-angle antenna design in planar integrated system and radar field.