宽带法布里-珀罗谐振腔天线

Wideband Fabry-Perot cavity antenna

为了改善法布里-珀罗谐振腔天线的带宽性能,提出了一种新的解决方案——在地板上加载渐变波纹结构,并设计了一种具有高增益和宽带性能的法布里-珀罗谐振腔天线.采用这种渐变的波纹结构,可以令地板与反射覆层之间的距离逐渐减小,合理地补偿辐射场的相位,从而改善辐射口径的场分布,因此能够有效地展宽天线的增益带宽.通过对该天线进行仿真分析,其结果表明,加载渐变波纹结构这一方法准确、有效,天线最大增益下降3dB对应的带宽(3dB增益带宽)从不加载时的17%提高到24%.同时,天线的阻抗带宽和最大增益基本保持不变,分别为35.7%和14.7dBi.该设计因具有相对较宽的带宽性能,可以被广泛地应用在无线通信等领域.

In order to improve the radiation bandwidth of the Fabry-Perot Cavity （FPC） antenna, a new approach has been proposed, namely employing a tapered corrugation structure on the ground plane. To verify the proposed method, a wideband high-gain FPC antenna is designed. By introducing the corrugation structure, the height of the cavity can be gradually reduced. In this way, the phase of the radiation field can be compensated, which leads to a well-distributed radiation aperture. Therefore, the 3 dB gain bandwidth can be enhanced. This structure is calculated by the CST Microwave Studio. The results validate the proposed approach, which helps 3 dB gain bandwidth improvement from 17% to 24%. Moreover, the 10 dB impedance bandwidth and the maximum realized gain remain unchanged, that is, 35.7% and 14. 7 dBi, respectively. This design can be widely used in many applications, such as wireless communication, due to its relatively wide bandwidth.