Wireless IC device and method of manufacturing the same
First Claim
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1. A wireless IC device comprising:
- an insulating sheet;
a plurality of coil electrodes defining an antenna coil and being arranged so as to sandwich the insulating sheet therebetween and to be connected to one another;
whereinthe plurality of coil electrodes are superposed with one another so as to define a single ring when viewed in plan from a direction extending perpendicular or substantially perpendicular to a direction in which a main surface of the insulating sheet extends;
the insulating sheet includes a plurality of stacked layers and certain ones of the plurality of coil electrodes arranged at both ends in the direction extending perpendicular or substantially perpendicular to the direction in which the main surface of the insulating sheet extends wind through a length of less than one circuit around a coil axis of the antenna coil;
a minimum value of a distance between an outer edge of the single ring and outer edges of the insulating sheet is greater than a distance in the direction extending perpendicular or substantially perpendicular to the direction in which the main surface of the insulating sheet extends between the plurality of coil electrodes; and
the plurality of coil electrodes and the plurality of stacked layers of the insulating sheet are arranged to prevent leaking of electric force lines generated between the plurality of coil electrodes so as to prevent variations of a resonant frequency of the wireless IC device due to changes of a capacitance generated in the plurality of coil electrodes due to the manner in which the wireless IC device is held.
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Abstract
A wireless IC device includes a plurality of insulating sheets that are stacked on top of one another. Coil electrodes are arranged so as to sandwich the insulating sheets therebetween and define an antenna coil by being connected to one another. The coil electrodes are superposed with one another and thereby define a single ring when viewed in plan from a z-axis direction.
115 Citations
16 Claims
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1. A wireless IC device comprising:
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an insulating sheet; a plurality of coil electrodes defining an antenna coil and being arranged so as to sandwich the insulating sheet therebetween and to be connected to one another;
whereinthe plurality of coil electrodes are superposed with one another so as to define a single ring when viewed in plan from a direction extending perpendicular or substantially perpendicular to a direction in which a main surface of the insulating sheet extends; the insulating sheet includes a plurality of stacked layers and certain ones of the plurality of coil electrodes arranged at both ends in the direction extending perpendicular or substantially perpendicular to the direction in which the main surface of the insulating sheet extends wind through a length of less than one circuit around a coil axis of the antenna coil; a minimum value of a distance between an outer edge of the single ring and outer edges of the insulating sheet is greater than a distance in the direction extending perpendicular or substantially perpendicular to the direction in which the main surface of the insulating sheet extends between the plurality of coil electrodes; and the plurality of coil electrodes and the plurality of stacked layers of the insulating sheet are arranged to prevent leaking of electric force lines generated between the plurality of coil electrodes so as to prevent variations of a resonant frequency of the wireless IC device due to changes of a capacitance generated in the plurality of coil electrodes due to the manner in which the wireless IC device is held. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of manufacturing a wireless IC device, comprising:
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a step of forming coil electrodes on a plurality of insulating sheets; and a step of stacking the plurality of insulating sheets on top of one another such that the coil electrodes are superposed with one another and thereby form a single ring when viewed in plan from a direction extending perpendicular or substantially perpendicular to a direction in which main surfaces of the plurality of insulating sheets extend;
whereincertain ones of the coil electrodes arranged at both ends in the direction extending perpendicular or substantially perpendicular to the direction in which the main surface of the plurality of insulating sheets extends wind through a length of less than one circuit around a coil axis of the single ring; a minimum value of a distance between an outer edge of the single ring and outer edges of the plurality of insulating sheets is greater than a distance in the direction extending perpendicular or substantially perpendicular to the direction in which the main surface of the plurality of insulating sheets extends between the coil electrodes; and the coil electrodes and the plurality of stacked insulating sheets are arranged to prevent leaking of electric force lines generated between the coil electrodes so as to prevent variations of a resonant frequency of the wireless IC device due to changes of a capacitance generated in the coil electrodes due to the manner in which the wireless IC device is held. - View Dependent Claims (13, 14, 15, 16)
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Specification