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

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 % and 54.9% respectively. Its maximal gain increased from 7.665 to 10.977 while the directivity has achieved the maximum of 11.19 from 7.45 dB.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.