箭头型超材料模型及其在无线电力传输中的应用

Design of Arrow-shaped Metamaterial and its Application in Wireless Power Transmission

为改善无线电力传输系统中微带发射天线的增益和方向性系数2个性能指标，提出一种新型箭头型超材料模型。通过HFSS电磁软件仿真和反演参数法提取其有效参数从而验证所设计的箭头型超材料模型在6．51～7．34GHz频段符合等效介电常数和等效磁导率同时为负的性质；将箭头型超材料模型加载作为微带天线覆层，从而使微带天线的E面和日面远场辐射方向性系数的HPBW分别减少48．7％和54．9％，其最大增益和最大方向性系数分别从7．665、7．45dB增加到10．977、11．19dB。该箭头型超材料模型和微带发射天线形成了较好的传输匹配，从而提升了无线电力能量的传输效率。

A kind of arrow-shaped metamaterial design which has potential application in the wireless power transmission system is proposed in this paper. The presented arrow-shaped metamaterial is utilized to enhance the gain and directivity of microstrip transmitting antenna and the results of numerical simulation based on HFSS software exhibit the metamaterial's negative permittivity and negative permeability in the frequency regime from 6. 51 GHz to 7. 34 GHz. When the antenna superstrate is made with the arrow-shaped metamaterial,the far field radiation directivity HPBWs of the E plane and H plane of the microstrip antenna are reduced by 48. 7 % and54. 9% respectively. Its maximal gain increased from 7. 665 to 10. 977 while the directivity has achieved the maximum of 11. 19 from7. 45 d B. The whole transmitting efficiency of wireless power transmission system has improved significantly with a well match between the arrow-shaped metamaterial and the microstrip transmitting antenna.