Electromagnetic coupler arrangement
EP4771768A1Pending Publication Date: 2026-07-08SATO HLDG CORP
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- SATO HLDG CORP
- Filing Date
- 2023-08-30
- Publication Date
- 2026-07-08
AI Technical Summary
Technical Problem
Existing electromagnetic coupler arrangements face inefficiencies due to the need for calibration and potential destructive interferences when encoding RFID inlays with varying geometries, leading to suboptimal coupling performance.
Method used
A self-adaptive array of coupling elements that selectively activates only the most efficient coupling element by sequentially feeding unmodulated electromagnetic energy and using harvester elements and feedback loops to determine and maintain optimal coupling, thereby avoiding destructive interferences.
Benefits of technology
This approach enables highly efficient and adaptive coupling with RFID inlays of arbitrary shapes without the need for specific calibration, ensuring reliable encoding and reading operations.
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Smart Images
Figure EP2023073840_06032025_PF_FP_ABST
Abstract
The present disclosure relates to a wireless electromagnetic coupler arrangement with a sequential array of coupling elements. The arrangement is self-adaptive in that it automatically selects a single one out of a plurality of coupling elements forming the array for being used as an active coupling element in coupling to planar metallic traces (in particular: RFID inlays) of arbitrary geometric shape without the need for a specific calibration or location procedure. This is achieved by means of feeding an unmodulated wave sequentially to each of the coupling elements, one after the other, until an element providing sufficient interaction suitable for performing signal coupling has been reached, in an initial sensing state. The existence of efficient interaction is detected by means of a threshold comparison of the DC output wave of a harvester associated with each coupling element and feeding back the result to a bypass switch. By restricting the activation to a single coupling element of the array only, the occurrence of destructive interference between plural coupling elements is avoided.
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