FIG. 4A illustrates an observation line which indicates a position above the primary coil antenna 21. FIGS. 4B-4D illustrate a simulation result that the strength of the magnetic field H is enhanced by using the small loop transmission coils 22 under the primary coil antenna 21 when the phone with the metallic cover or case having the secondary coil antenna (see FIG. 5B) is placed at different heights above the primary coil antenna 21. FIG. 4B illustrates the situation where there is no phone with a metallic cover and/or case above the primary coil antenna 21, and the magnetic strength of the primary coil antenna 21 with small loops 22 is higher than the primary coil antenna 21 without the small loops 22. FIG. 4C illustrates the situation where the distance between the phone with a metallic cover and/or case is 25 mm, and the magnetic strength of the primary coil antenna 21 with small loops 22 is higher than that of the primary coil antenna 21 without small loops 22. FIG. 4D illustrates the situation where the distance between the phone with a metallic cover and/or case is 50 mm, and the magnetic strength of the primary coil antenna 21 with small loops 22 is higher than that of the primary coil antenna 21 without small loops 22.