超材料加载的高增益Vivaldi天线

High Gain Vivaldi Antenna Loaded with Metamaterials

文中研究了一款超宽带对拓式Vivaldi天线。为了提高其增益,设计了一款具有非谐振式特性的超宽带人工电磁超材料单元,将此单元与对拓式Vivaldi天线集成后,可以在不影响天线效率及回波损耗的特性下提高天线增益,实测最高可提高2.5 dB。天线尺寸为0.9250λ×0.6500λ×0.0083λ,实测阻抗带宽为2.5 GHz~20.0 GHz,可达8个倍频程,在15 GHz时实测增益可达到9.56 dBi。天线实测与仿真结果基本吻合。在主要工作频带内,天线呈现较好的定向辐射效果,可应用于电磁兼容测试、探地雷达测试、超宽带无线传输系统、微波脑检测系统等领域。

In this paper,an ultra-wideband extended Vivaldi antenna is studied.In order to improve its gain,an ultra-wideband artificial electromagnetic metamaterial element with non-resonant characteristics is designed.After integrating this element with the extension Vivaldi antenna,the antenna gain can be improved without affecting the antenna efficiency and echo loss characteristics.The measured maximum gain can be increased by 2.5 dB.Antenna size is 0.9250λ×0.6500λ×0.0083λ,the measured impedance bandwidth is from 2.5 GHz to 20.0 GHz,up to 8 octaves,and the measured gain can reach 9.56 dBi at 15 GHz.The measured and simulated results of the antenna are basically consistent.The antenna shows good directional radiation effect in the main operating frequency band,can be used in electromagnetic compatibility test,ultra-wideband wireless transmission system,ground penetrating radar test,microwave brain detection system and other fields.