Wireless communication device

摘要

A wireless communication device includes 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. 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. 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.

主权项

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; and the wireless communication device is configured such that when the feeding substrate is arranged to face a conductive object in a planar view, the conductive object overlaps the plane conductor and does not overlap the coil conductor.