Antenna device and IC card having the same

The antenna device achieves improved coupling with external IC modules by employing a first coil pattern with a specific structure, ensuring effective communication even at reduced self-resonance frequencies.

JP2025044368APending Publication Date: 2025-04-02TDK CORP
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Patent Information

Application Number
JP2023151895
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2023-09-20
Publication Date
2025-04-02

AI Technical Summary

Technical Problem

Existing antenna devices face challenges in achieving sufficient coupling with external IC modules, especially when the self-resonance frequency is reduced.

Method used

The antenna device incorporates a first coil pattern with a unique structure, including a first, second, and third coil part, where each turn of the second coil part has a first part circumference rotating coaxially with the third coil part and a second part circumference projecting outward in the radial direction. This configuration allows for improved coupling with the IC module.

Benefits of technology

This design enables the antenna device to maintain sufficient coupling with external IC modules even when the self-resonance frequency is reduced, effectively addressing the coupling issues faced by existing technologies.

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Abstract

To provide an antenna device capable of obtaining sufficient coupling with an external IC module even when the self-resonant frequency is lowered.SOLUTION: An antenna device 1 includes a first coil pattern 100 having a first winding portion 110, a second winding portion 120, and a third winding portion 130. The first winding portion 110 winds a plurality of turns, has an open outer circumferential end, and has an inner circumferential end connected to the outer circumferential end of the second winding portion 120. The second winding portion 120 winds a plurality of turns, and has an inner circumferential end connected to the outer circumferential end of the third winding portion 130. The third winding portion 130 winds a plurality of turns, and has an open inner circumferential end. Each turn of the second winding portion 120 includes a first partial winding portion 121 that winds coaxially with the third winding portion 130, and a second partial winding portion 122 that protrudes radially outward from the first partial winding portion 121 and winds around a central axis P1 located between the first partial winding portion 121 and the first winding portion 110.SELECTED DRAWING: Figure 5
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