Contrary to the well‐known dispersing magnetic field distribution characteristic, it is possible to some extend to focus on the magnetic field by synthesizing the magnetic field generated from multiple coils. A novel synthesized magnetic field focusing (SMF) technology is explained in this chapter and a non‐radiative but focused magnetic field is experimentally demonstrated as a one‐dimensional example. Contrary to common belief, a magnetic field can be focused arbitrarily by increasing the number of current‐controlled transmitting coils in a manner similar to that of conventional beam‐forming. However, the proposed SMF is independent of the frequency when it ranges from the DC to the RF frequency. Chronic problems associated with conventional wireless power transfer and magnetic induction tomography technologies, that is, poor resolution and electromagnetic interference due to the extent of the magnetic field, can be resolved when using the proposed SMF technology. The spatial resolution of the magnetic field of an experimental kit composed of ten coils spaced 5 cm apart with a 90 cm‐long ferrite core was 12.5 cm at a distance of 10 cm, which is four times that of a non‐focusing coil and which may increase if more coils are used.
This chapter is based on the paper by B.H. Choi, J.P. Cheon, J.H. Kim, and C.T. Rim, “A novel synthesized magnetic field focusing (SMF) technology,” IEEE Trans. on Magnetics Letters, accepted.
Magnetic Field Focusing
2017-07-11
8 pages
Article/Chapter (Book)
Electronic Resource
English
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