Tag device, antenna, and portable card
First Claim
1. A tag device for performing radio communication, the device comprising:
- an antenna unit including;
a main loop section being a loop metal foil mounted on a surface of a dielectric substrate for sending and receiving radio waves, andcapacitive load sections being metal foils connected to the main loop section and each having a load corresponding to a capacitance component; and
a control unit connected to the main loop section for controlling information via the radio waves;
wherein when the tag device is located near a person'"'"'s body, loop electric current distribution is created between a surface of the person'"'"'s body and the main loop section by an electric current which runs through the main loop section and the antenna unit functions as a loop antenna via the surface of the person'"'"'s body.
1 Assignment
0 Petitions
Accused Products
Abstract
A tag device that performs high-quality radio communication without radio wave radiation or receiving characteristics being deteriorated near a person'"'"'s body and without hindering communication by another IC tag. A main loop section sends and receives radio waves. The main loop section is a metal foil and has the shape of a long thin loop. The area of the main loop section is smaller than the area of a dielectric substrate. The main loop section covers part of surfaces of the dielectric substrate and part of sides of the dielectric substrate so as to put the dielectric substrate inside the loop. The main loop section is mounted in a horizontal direction of the dielectric substrate. Each of capacitive load sections is a metal foil and has a load corresponding to a capacitance component. The capacitive load sections are located at both end portions of the main loop section which covers part of the front side of the dielectric substrate and are located at both end portions of the main loop section which covers part of the reverse side of the dielectric substrate. A control unit is connected to the main loop section and controls information via the radio waves.
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Citations
23 Claims
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1. A tag device for performing radio communication, the device comprising:
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an antenna unit including; a main loop section being a loop metal foil mounted on a surface of a dielectric substrate for sending and receiving radio waves, and capacitive load sections being metal foils connected to the main loop section and each having a load corresponding to a capacitance component; and a control unit connected to the main loop section for controlling information via the radio waves; wherein when the tag device is located near a person'"'"'s body, loop electric current distribution is created between a surface of the person'"'"'s body and the main loop section by an electric current which runs through the main loop section and the antenna unit functions as a loop antenna via the surface of the person'"'"'s body. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An antenna for radiating and receiving radio waves, the antenna comprising:
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a main loop section being loop metal for sending and receiving the radio waves; and capacitive load sections being metal connected to the main loop section and each having a load corresponding to a capacitance component; wherein when the antenna is located near a person'"'"'s body, loop electric current distribution is created between a surface of the person'"'"'s body and the main loop section by an electric current which runs through the main loop section and the antenna functions as a loop antenna via the surface of the person'"'"'s body. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A portable card for performing radio communication, the card comprising:
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an antenna unit including; a main loop section being a loop metal foil mounted on a surface of a dielectric substrate for sending and receiving radio waves, and capacitive load sections being metal foils connected to the main loop section and each having a load corresponding to a capacitance component; a control unit connected to the main loop section for controlling information via the radio waves; and a member having the shape of a portable card for housing the antenna unit and the control unit; wherein when the portable card is located near a person'"'"'s body, loop electric current distribution is created between a surface of the person'"'"'s body and the main loop section by an electric current which runs through the main loop section and the antenna unit functions as a loop antenna via the surface of the person'"'"'s body. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification