3D Spiral RFID Antenna Layout for Orientation-Independent Coupling
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Solution Overview
Problem
Current radiofrequency antennas in smart cards and RFID devices have limited fields of action and require specific orientation for effective communication with readers, restricting their usability.
Innovation Solution
A spiral-shaped antenna is manufactured on a substrate with portions embedded and others extending above the plane, allowing the antenna's axis to be parallel to the substrate, enabling communication in any orientation by forming loops over the substrate and using separate substrates for electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna is placed flat opposite the reader, then proper coupling and good communication are achieved, but the device loses orientation flexibility and usability
Solution Approach 1:
The patent transitions from a conventional planar antenna layout to a three-dimensional spiral structure where the antenna axis is parallel to the substrate plane. This dimensional reconfiguration enables the antenna to maintain effective coupling in multiple orientations, resolving the contradiction between coupling reliability and orientation flexibility by operating in a different spatial dimension
Solution Approach 2:
The spiral antenna geometry introduces curvature and three-dimensionality to the traditionally flat antenna structure. The curved spiral path with its axis parallel to the substrate creates a more isotropic radiation pattern, allowing reliable communication regardless of the card's orientation relative to the reader
2Ease of manufacture
If conventional planar antenna structures are used, then manufacturing is simple and economical, but the field of action is limited and orientation-dependent
Solution Approach 1:
The invention maintains manufacturing simplicity by using standard smart card production techniques while achieving three-dimensional antenna geometry through the spiral configuration. The axis-parallel spiral design provides enhanced field of action and orientation independence without requiring complex manufacturing processes
Solution Approach 2:
The spiral antenna structure with axis parallel to the substrate serves multiple functions: it maintains electrical connectivity, provides orientation-independent coupling, and works with conventional smart card manufacturing processes, making the solution universally applicable to existing RFID and contactless card systems
Data Source
AI summary
The invention relates to a method for manufacturing an antenna for a radiofrequency transponder, said antenna including a spiral comprising turns which extend, at least in part, over an insulating substrate; the method is characterised in that it includes the step ac-cording to which at least one first portion of each turn is deposited on said substrate at a first plane level, at least one second portion of each turn being formed or kept at a distance from the first plane level of the substrate, the axis of the spiral being parallel to the plane of the substrate. The invention also relates to a portable electronic object comprising, in a fixed or removable manner, the obtained antenna.