RFID Transponder Folded Foil Antenna on Conductive Surfaces
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Solution Overview
Problem
RFID transponders operating in the UHF range face challenges in reliability on conductive surfaces due to the influence of the installation surface's electrical properties, requiring innovative antenna designs like PIFA and PAFFA to mitigate these issues, but these are complex and costly to manufacture.
Innovation Solution
A mechanical solution involving a folded foil structure with a spacer piece or direct support on case side walls, incorporating a ground plane, transmission lines, and an insulator layer to maintain antenna separation and stability, allowing for reliable operation on conductive surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PIFA or PAFFA antenna structures are used to improve reliability on conductive surfaces, then the transponder can operate reliably on conductive surfaces, but the manufacturing complexity and cost increase due to complex construction and vias
Solution Approach 1:
The patent extracts the problematic ground element from the traditional PIFA/PAFFA structure and replaces it with a simple conductive adhesive layer applied directly to the base. This removes the complex via connections and three-dimensional folded structures while maintaining the essential function of creating a capacitive coupling to the conductive surface, thereby simplifying manufacturing while preserving reliability on conductive surfaces
Solution Approach 2:
The invention replaces expensive, complex PIFA/PAFFA antenna structures with a simple, inexpensive alternative using basic conductive adhesive material. This simpler structure achieves the same functional outcome (reliable operation on conductive surfaces) at significantly lower manufacturing cost and complexity, effectively using a 'cheaper' solution that doesn't sacrifice performance
2Reliability
If a separate conductive shielding plane is added to reduce the effect of the base, then the transponder can function on conductive surfaces, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the ground element function with the base structure itself by applying conductive adhesive directly to the base surface. This eliminates the need for a separate, additional conductive shielding plane, as the base with applied adhesive serves双重 purposes: as the mounting surface and as the capacitive coupling element, thereby reducing structural complexity while maintaining functionality on conductive surfaces
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables reliable operation of RFID transponders on conductive surfaces by maintaining antenna separation and stability, reducing manufacturing complexity and cost, and enhancing electrical properties, applicable to both traditional and PAFFA antenna structures.
Implementation Method 1
The characteristic features of the transponder according to the invention are stated in the accompanying Claims 1. A blank for the transponder according to the invention is presented in Claim 9. The invention can be applied to both RFID transponders equipped with a separate ground plane, and to transponders equipped with a newer PAFFA-type antenna structure.
Implementation Method 2
A passive RFID transponder is a small device comprising an antenna, microcircuit, and memory, which uses backscattering to transmit the contents of its memory when it receives a transmission command from a reading device and the reading device illuminates it with a radio signal.
Implementation Method 3
The transmission of power and information between the transponder and the reader can take place with the aid of a magnetic field, an electric field, or a radiating radio signal.
Data Source
Figure 1a~1c
Figure 2a~2b
Figure 3a~3c
AI summary
The i nven t i on r e l a t e s t o a n RFI D transponder, which includes a case (1 0), a radiator (12), and a ground element (14), as opposed antenna element s, a ground plane (14a intended to be set against the base at a distance from the radiator, and an electrical chip component (16). The radiator (12), ground element (14),and chip component (16) are installed on a special foil (20), which also comprises the said ground plane (14 a) on the first plane (A) and a fold (20 a) between the first and second plane, the foil (20) being thus divided into a first part (20b) on the first plane (A), the fold (20a), and a second part (20c) on the second plane (B). The case (10) has attached to it intermediate structure (18) for supporting thefirst part (20b) and the second part (20c) of the foil (20) on the said first plane (A) and second plane (B).