Title:
ANTENNA DEVICE AND IC CARD WITH THE SAME
Document Type and Number:
Japanese Patent JP2023006010
Kind Code:
A
Abstract:
To provide an antenna device in which a communication characteristic is improved.SOLUTION: An antenna device comprises an antenna coil AC composed of a conductive pattern having a plurality of turns provided on one front surface 31 of a base material 30. If each turn of the antenna coil AC is defined by setting an external peripheral end 70 of the antenna coil AC as a start point, each turn includes: a first end part 71 as an external peripheral end of the turn; a second end part 72 as an internal peripheral end of the turn; and a transition point 73 that is positioned between the first end part 71 and the second end part 72. Each turn includes: a revolving section 81 that is positioned between the first end part 71 and the transition point 73 and is extended in a peripheral direction; and a transition section 82 that is positioned between the second end part 72 and the transition point 73. The transition point 73 is separated from a coil axis of the antenna coil AC more than the first end part 71, and the second end part 72 is connected to the first end part 71 of the turn adjacent on an inner peripheral side.SELECTED DRAWING: Figure 7
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Inventors:
KAJIKIYA SHOMA
Application Number:
JP2021108368A
Publication Date:
January 18, 2023
Filing Date:
June 30, 2021
Export Citation:
Assignee:
TDK CORP
International Classes:
H01Q7/00; G06K19/077; H01Q1/50; H01Q5/335; H01Q7/06
Attorney, Agent or Firm:
Mitsuhiro Washito
Ogata Japanese
Ogata Japanese
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