A high efficiency wireless charging antenna with embedded magnetic core of segmented two-turns loop

In this paper, a high-efficiency transceiver antenna with embedded high magnetic permeability core of segmented two-turns loop is presented. It can be applied in the implanted device of monitoring human body neural with a wireless charging and bi-directional data transmission. The whole structure of transmitting and receiving antenna is basically similar; the difference is that receiving antenna is composed of double-sided ring and an embedded magnetic core at central position, transmitting antenna can be realized by dividing ring and welding fixed-value capacitor at corresponding position. The efficiency of wireless energy transfer has been improved and the specific absorption rate value has been reducing by simulation optimization. Compared with conventional loop antenna, our transmission efficiency has been exceed doubled and average SAR reduced by approximately 52%, when the distance of wireless transmission is 5mm. Finally, we fabricate a conventional loop antenna, a segmented loop antenna with embedded magnetic core and a kind of mixed liquid that have the same dielectric parameters with skin at 402MHz. Experiences show that actual results of transmission efficiency are in good agreement with the simulation results.