As a second comparative example, a configuration of a communication device 300 arranged on a circuit board 332 of a mobile phone will be described below with reference to FIGS. 6A and 6B. FIG. 6A is a perspective view of an antenna substrate 311 on which a magnetic sheet 313 is arranged on an x-y plane, and FIG. 6B is a sectional view of the antenna substrate 311 on which the magnetic sheet 313 is