Wireless communication device
First Claim
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;
whereinthe 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.
1 Assignment
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Accused Products
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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Citations
18 Claims
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1. A wireless communication device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An RFID system comprising:
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a mounting substrate; and a wireless communication device fixed on the mounting substrate;
whereinthe 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;
whereinthe 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. - View Dependent Claims (18)
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Specification