基于超材料结构的定频波束可调天线设计

Design of frequency-fixed beam-steering antenna based on metamaterial

摘要:

提出了一种新颖的波束可调天线。该天线辐射单元采用加载电容的超材料结构，相较于传统波导裂缝阵列天线的辐射缝隙，超材料辐射单元的尺寸缩小了76%；天线采用蚀刻有超材料结构的Rogers RT5880印刷电路板(PCB)作为天线辐射面，通过调整加载在超材料单元上的电容来调整波束指向。天线的测试结果与电磁仿真软件仿真结果接近。测试和仿真结果表明，天线工作在频率15 GHz，最大增益为11 dBi，辐射效率为80.8%，波束可调天线实现了-28°,-20°,-12°,-6°,6°, 13°和24°七种不同波束指向。

Abstract:

A novel beam-steering antenna is proposed. The radiation element of the antenna is implemented by the metamaterial structure loaded with capacitor, which can reduce the length by 76% compared with the conventional radiation element of the waveguide slot antenna. The antenna is fabricated by Printed Circuit Board(PCB) of Rogers RT5880 and waveguide. The PCB with etched metamaterial elements is used as the antenna radiation surface. The beam direction can be controlled by changing loaded capacitor. Measured antenna patterns show a good agreement with theoretical predictions. This prototype demonstrates the antenna operates at 15 GHz. The peak gain is 11 dBi. The radiation efficiency is 80.8%. The beam-steering antenna achieves seven beam angles, including -28°, -20°, -12°, -6°, 6°, 13° and 24°.