1. Hanyang University 1/13 Resonance Coil Review Wonhong Jeong 2014.8.6

2. Hanyang University 2/13 Index Antennas & RF Devices Lab.

3. Hanyang University 3/13 Diameter of a coil: 60mm (model 1), 100mm (model 2) Coil pitch: 2mm (model 1 & model 2) Distance between coil layers: 1.4mm (model 1 & model 2) Turns: 60mm (20 turns), 100mm (9.5 turns) g g Generally, inductance becomes large with extension of the diameter of a coil.

4. Hanyang University 4/13 Diameter of a coil: 60mm (model 3 & model 4) Coil pitch: 1.4mm (model 3), 2.2mm (model 4) Distance between coil layers: 1.4mm (model 1 & model 2) Turns: 20 turns

5. Hanyang University 5/13 Diameter of a coil: 60mm (model 3 & model 4) Coil pitch: 2.0mm (model 5 & model 6) Distance between coil layers: 1.4mm (model 5) 2.0mm (model 6) Turns: 20 turns

6. Hanyang University 6/13 Diameter of a coil: 60mm (model 7), 48mm (model 8) Coil pitch: 2.2mm (model 7), 1.4mm (model 8) Distance between coil layers: 2.2mm (model 7 & model 8) Turns: 60mm (20 turns), 100mm (9.5 turns)

7. Hanyang University 7/13  Target to mobile device  For increasing Self and mutual inductances, used ferrite plate.  Structure Without ferrite plate: L=56 uH, C=3.55 nF at 357 Khz Attached ferrite plate: L=98.2 uH, C=2.02 nF, M=36.3 uH(k=0.49)

8. Hanyang University 8/13  Analytical expressions

9. Hanyang University 9/13  Comparison  Input impedance & radiated emissions from the system  The differences among the analytical expressions, the simulation and the measurement results caused by the ignored mutual coupling between the transmitting and receiving coils, and the difference in the series parasitic resistance of the coils.

10. Hanyang University 10/13  Modeling Source resistance Load resistance Sending coil resonance degree Receiving coil resonance degree

11. Hanyang University 11/13  Frequency splitting analysis Only the voltage gain and the output power of the two-soil structure are proved to split with the driving frequency at close distances. The efficiency can deduce as below.

12. Hanyang University 12/13  Calculations and experiments Coil radius: 140 mm Experiment environment Calculation results Experiment results

13. Hanyang University 13/13 Thank you for your attention