WIRELESS IC DEVICE
First Claim
1. A wireless IC device comprising:
- a wireless IC chip;
a radiation plate including a radiation electrode; and
a functional substrate including a matching circuit arranged to perform impedance matching between the wireless IC chip and the radiation electrode, the functional substrate including a coupling electrode coupled to the radiation electrode, inductance elements, and a capacitance element;
whereinthe matching circuit included in the functional substrate has a configuration such that a relationship between a reactance component of an impedance obtained by viewing the wireless IC chip from a connecting portion connecting the wireless IC chip and the functional substrate to each other and a reactance component of an impedance obtained by viewing the radiation electrode from the connecting portion connecting the wireless IC chip and the functional substrate to each other is a conjugate relationship.
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Accused Products
Abstract
An electromagnetic coupling module includes a wireless IC chip and a functional substrate. The electromagnetic coupling module is mounted on a radiation plate, preferably using an adhesive, for example. On the upper surface of a base material of the radiation plate, two long radiation electrodes are provided. On the undersurface of the functional substrate, capacitive coupling electrodes that individually face inner ends of the radiation electrodes are provided. A matching circuit arranged to perform the impedance matching between the wireless IC chip and each of the radiation electrodes includes the capacitive coupling electrodes. As a result, it is possible to reduce the size, facilitate the design, and reduce the cost of a wireless IC device.
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Citations
15 Claims
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1. A wireless IC device comprising:
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a wireless IC chip; a radiation plate including a radiation electrode; and a functional substrate including a matching circuit arranged to perform impedance matching between the wireless IC chip and the radiation electrode, the functional substrate including a coupling electrode coupled to the radiation electrode, inductance elements, and a capacitance element;
whereinthe matching circuit included in the functional substrate has a configuration such that a relationship between a reactance component of an impedance obtained by viewing the wireless IC chip from a connecting portion connecting the wireless IC chip and the functional substrate to each other and a reactance component of an impedance obtained by viewing the radiation electrode from the connecting portion connecting the wireless IC chip and the functional substrate to each other is a conjugate relationship. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification