Patent ID: 8613395
Filing Date: 2013-12-24
Classification: G06K,H01L,H01Q

Abstract:
1. A wireless communication device comprising: a wireless IC chip that processes a high-frequency signal; and a feeding substrate including a coil conductor, a plane conductor, and a matching circuit that is connected to the wireless IC chip and that has a predetermined resonant frequency; wherein the coil conductor and the plane conductor are connected to the matching circuit; the wireless communication device, when used by itself, operates as a monopole antenna in which the plane conductor functions as a ground and the coil conductor functions as a radiation element; and when a conductive object is in a vicinity of the plane conductor, the plane conductor is coupled to the conductive object and the wireless communication device operates as a dipole antenna in which the plane conductor and the conductive object function as a first radiation element and the coil conductor functions as a second radiation element.