基于超介质的超宽带小型化天线设计

采用SRR 环和CLP 环两种不同谐振单元,构造了一种新型超介质结构单元。该单元的电谐振和磁谐振的谐振频点比较接近,易于频带融合,从而拓展超介质材料双负(介电常数和磁导率都为负)特性的频率带宽。利用加载的方法,在单极子天线上加载该种新型超介质结构单元,以改善天线的辐射特性。利用电磁仿真软件对其进行了仿真设计和优化。仿真结果表明,该天线实现了超宽带工作,在3. 8 ~ 14GHz 的频率范围内,驻波比小于2;同时,天线实现了高增益特性,在整个频率范围内,增益都高于7dB。最后,对天线进行了加工测试,实验测试结果与仿真结果基本吻合,进一步验证了该天线的工作性能。

Design of Miniaturized Ultra-Wideband Antenna Based on Metamaterial

A new type of left-hand metamaterial unit cell, which is a combination of the different resonant units including SRR and CLP, is presented. The electric and magnetic resonance of the new metamaterial unit is studied and they have small frequency space. Therefore, the frequency bandwidth with double negative (negative dielectric constant and negative magnetic permeability) is enlarged by frequency fusion. The new metamaterial unit is also loaded on a monopole antenna to improve radiation performance. An electromagnetic simulation software (CST) is used to simulate the radiation performance of the antenna. The simulation results show that the VSWR is lower than 2 in frequency band of 3. 8 ~14GHz, and the gain is higher than 7dB in the whole frequency rang. We also fabricate the antenna and measure the return loss and gain, and the experimental results are in good agreement to the numerical simulations.