基于零折射超材料的双频高增益微带天线*

基于双面对称单环开口谐振器对结构奇异的电磁特性,设计了一种频率可控的各向异性零折射超材料。将这种零折射超材料应用于普通双频微带天线,制备了中心频率为5. 15GHz 和6. 8GHz 的零折射双频微带天线。仿真和测试结果显示,由于零折射超材料的引入,天线的侧向辐射减弱,方向性增强。在低频工作时,零折射微带天线E 面和H 面半功率波束宽度分别减小了29°和10°,增益提高了2. 2 dB。在高频工作时,零折射微带天线E面和H 面半功率波束宽度均减小了16毅,增益提高了2. 4 dB。将零折射超材料应用于微带天线的介质基板,为高性能双频微带天线设计提供了有效途径。

A Novel Dual Band High Gain and High Directivity Microstrip Patch Antenna Based on Zero Index Metamaterial

Based on special electromagnetic characteristic of dual layer symmetry single ring resonator pair cell, a novel anisotropic metamaterial is designed. A novel of dual band zero index microwave antenna of 5.15GHz and 6. 8GHz is proposed with an application of zero index metamaterial structure. Compared to the conventional microwave antenna, the results show that the performance of the dualband zeroindex microstrip antenna has improved remarkably, which has a lower lateral radiation, an enhanced forward radiation. At lower operating frequencies, the half power beam widths (HPBW) of E and H plane of the zero index microwave antenna is reduced by 29°and 10°, respectively, the gain is increased by 2.2 dB.At higher operating frequency, the HPBW of the zero index microwave antenna is reduced by 16 for both E and H plane,an increasing of 2.4 dB for the gain. It is an efficiency method to design dual band microwave antenna with good performance by applying zero index metamaterial in the antenna.