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Antenna system for contactless microcircuits

A technology for microcircuits and microcircuit cards, which is applied to variable reactance loop antennas, record carriers used by machines, instruments, etc., can solve the problems of increased manufacturing costs of microcircuit cards and the like

Active Publication Date: 2017-05-10
WISEKEY SEMICONDUCTORS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The result is a substantial increase in the manufacturing costs of such microcircuit cards

Method used

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  • Antenna system for contactless microcircuits
  • Antenna system for contactless microcircuits
  • Antenna system for contactless microcircuits

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] Figure 4 and 5 A contactless microcircuit card C2, C3 is shown comprising antenna coils CC2, CC3 and a module comprising a microcircuit M1 and an antenna coil MC1 arranged around and connected to the microcircuit. Here, the term "surrounding" does not mean that the microcircuit M1 and the coil MC1 must be on the same plane. Coil CC2 or CC3 and MC1 comprise several turns, eg 2 to 4 turns for coil CC2 or CC3 and 5 to 10 turns for coil MC1 . Coil CC2 or CC3 forms a large loop CL21 or CL31 and a small loop CL22 or CL32. The large loop CL21, CL31 follows the edge of the card C2, C3 or only a part of the edge, as figure 1 shown. Large rings can thus be near the edge of the card, and the minimum distance can reach 2 to 3mm. The antenna coil MC1 may be disposed opposite to the loops CL22, CL32. In this case, the coils MC1 and CC2, CC3 can be implanted into the cards C2, C3 at different depths. The antenna coil MC1 may also be surrounded by loops CL22, CL32. In this cas...

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PUM

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Abstract

The invention relates to a method of manufacturing a microcircuit card comprising the steps of: forming in a card (C2) a first antenna coil (CC2) comprising a portion (CL21) following the edge of said card; forming a module, said module comprising a microcircuit (M1) and a second antenna coil (MC1) surrounding and connected to the microcircuit; and implanting the module into said In the card, the first antenna coil is coupled to the second antenna coil by induction, the first antenna coil is shaped in such a way that only a part of the second antenna coil is located away from the first antenna The distance between the coils is less than 5% of the width of the second antenna coil.

Description

technical field [0001] The present invention relates to a contactless microcircuit or a contactless integrated circuit, and in particular to a microcircuit integrated into an object, such as a plastic card (polymer resin). Background technique [0002] Contactless or near-field communication NFC microcircuits have been developed to conduct transactions with terminals through inductive coupling or electric field coupling. [0003] In order to communicate, in particular by inductive coupling, a sufficient inductive coupling factor must be obtained between the antenna coil of the terminal and the antenna coil connected to the microcircuit. This coupling factor depends on the respective dimensions of the terminal and the antenna coil of the microcircuit, and on the relative distance and position of these two coils. The closer the size of the microcircuit coil to the terminals, the higher the coupling factor between the two coils can be. [0004] Usually, the antenna coil of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077
CPCG06K19/07756G06K19/07775G06K19/07794Y10T29/49018G06K19/07745G06K19/07783H01Q7/005
Inventor B·查拉特P·皮克
Owner WISEKEY SEMICONDUCTORS