基于零折射率超材料的新型匹配高增益贴片天线

Novel Matched High-gain Patch Antenna Based on Zero Index Metamaterials

针对基于零折射率超材料的矩形贴片天线的快速设计,提出了应用微遗传算法的自动优化方案,建立了利用Visual Basic语言编程调用时域有限差分方法对该天线的参数进行自动优化的计算机仿真程序,并成功计算出了优化的参数数据。采用优化数据加工制作了天线实物并进行了测量,仿真和实测结果吻合良好,零折射率材料对矩形贴片天线增益提升超过10 dB,实现了最高16.2 dBi的增益,并且在11.7 GHz到12.6 GHz的频带范围内阻抗匹配良好,证明了该方案的有效性和可靠性。

By using Micro-Genetic Algorithm（MGA）,an automatically optimized scheme was proposed to deal with the rapid design of rectangular patch antenna with zero-index metamaterials.In order to realize this scheme,an automatic computer aided simulation procedure was constructed by using Visual Basic program to call the Finite-Difference Time-Domain method（FDTD）.The optimized parameters of the antenna were obtained by running this procedure.A prototype of the antenna was fabricated and measured by utilizing the optimized parameters.The measured results coincided with the simulations.As results,over 10 dB enhanced gain was achieved by using this zero index metamaterials.The antenna had a 16.2 dBi maximum gain and achieved a fine impedance matching in the frequency range from 11.7 GHz to 12.6 GHz,which showed that this scheme was effective and reliable.