Wireless communication device
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United States of America Patent
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Feb 24, 2015
Grant Date -
Jun 19, 2014
app pub date -
Feb 24, 2014
filing date -
Feb 28, 2011
priority date (Note) -
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Abstract
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.
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