一种高增益低旁瓣双贴片微带天线阵

A High Gain Dual-patch Microstrip Antenna Array with Low Sidelobes

设计了一种可工作于Ku波段的高增益、低剖面的准空气微带阵列。天线阵列整体采用分层的准空气微带结构,每个天线单元采用双贴片单元结构以提高天线增益、抑制交叉极化,最终提高了组阵的效率和增益。在阵列天线中采用台阶式分块馈电,有效地抑制了旁瓣电平。最后通过仿真计算设计并实际制作了64单元阵列天线,实验结果和仿真结果吻合良好,阻抗带宽达到17.54%,中心频率14.25 GHz时增益达到24.5 dB,E面旁瓣低于-18 dB,H面旁瓣低于-12 dB。

The design of a Ku-band antenna array with high gain and low profile is presented in this paper. The array structure is based on quasi air microstrip structure, with dual-patch elements to increase its gain and suppress the cross polarization, which resuits in a great enhancement of the total efficiency and gain. To reduce the sidelobe level, a reasonable power distribution is used. By simulation, a 64 element array is designed and manufactured. The measured impedance bandwidth is t7.54%, the gain at centre frequency 14.25 GHz is 24.5 dB, and the side lobe level is - 18 dB in E-plane and - 12 dB in H-plane respectively, which agrees well with the simulated results.