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Effects of electromagnetic metamaterials on radio energy transmission systems

Electromagnetic metamaterials can improve the transmission efficiency and increase the distance between transmitting and receiving coils in the radio energy transmission system. However, due to the problems of placement and space occupancy, it has brought great inconvenience in the application of electromagnetic metamaterials in mobile electronic devices. Of the study of this problem, this paper designs a new single-negative magnetic metamaterial slab with double-sided spiral structure. The S parameter was obtained by HFSS simulation software, and then the images of permeability and permittivity were obtained by combining Smith algorithm. The simulation results showed that when the frequency is 6.78 MHz, the real part of the permeability of the material reaches the negative extreme value and the real part of the permittivity also reaches the maximum value. This indicated that the material exhibits the characteristics of single-negative magnetic metamaterials. The simulation and experimental results revealed that when the single-negative magnetic metamaterial slabs are placed near the transmitting and receiving coils, the transmission efficiency of the radio energy transmission system is increased by about 20%. The problems of the placement and occupied space of electromagnetic metamaterials in wireless energy transmission systems have been effectively solved.