RFID Transponder Single Antenna Inductive Coupling

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current RFID transponder manufacturing processes are complex and inefficient, particularly in achieving accurate tuning for dual HF and UHF transmission modes, leading to reduced reproducibility and quality yield, and existing configurations either occupy excessive card space or suffer from performance issues like faraday cage interference.

Innovation Solution

The transponder design incorporates a single HF antenna functioning as a booster for both HF and UHF modes, with the UHF chip inductively coupled to the HF antenna, allowing for minimal space usage and improved performance by eliminating faraday cage interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a separate UHF antenna and HF antenna are used in the transponder, then both HF and UHF communication modes can be supported, but the card space is excessively occupied

Engineering Contradiction:

Improvecommunication mode supportVSAvoidcard space

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The HF antenna is designed to serve dual purposes: as a booster antenna for UHF communication and as a direct antenna for HF communication. This multi-functional design eliminates the need for a separate UHF antenna, thereby reducing card space while supporting both communication modes

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the UHF booster antenna function with the HF antenna structure. The HF antenna is configured to perform both HF communication and UHF boosting functions, combining what would traditionally be separate antenna systems into a single integrated structure

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If traditional connecting means such as pads, studs or wires are used to connect the antenna to the chip, then electrical connection is achieved, but the transponder is vulnerable to mechanical stress

Engineering Contradiction:

Improvemechanical stress resistanceVSAvoidconnection structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces traditional mechanical connection methods (pads, studs, wires) with an inductive coupling mechanism. The UHF chip is inductively coupled to the HF antenna, creating an electrical connection through magnetic field coupling rather than physical contact, thereby eliminating mechanical stress vulnerabilities

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an intermediary coupling mechanism between the antenna and chip. The inductive coupling acts as an intermediary that transfers energy and signals between the HF antenna and UHF chip without requiring direct physical connection, thereby protecting against mechanical stress

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If multiple antennas are placed side-by-side for HF and UHF modes, then both communication modes are supported, but the entire card surface is occupied leaving no space for other technologies

Engineering Contradiction:

Improvecommunication mode supportVSAvoidavailable card space

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent nests the UHF booster antenna function within the HF antenna structure. The HF antenna is configured to serve as both the HF communication antenna and the UHF booster antenna, creating a nested functional arrangement that minimizes space occupation

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The HF antenna is designed with multi-functionality, serving as both the primary HF communication antenna and the UHF booster antenna. This universal design allows a single antenna structure to support multiple communication modes without requiring additional separate antenna elements

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 configuration enhances read range and efficiency for both HF and UHF communications, optimizing space on the card and simplifying manufacturing while maintaining performance across multiple frequency modes.

Implementation Method 1

a secondary antenna (18) connected in series to the primary antenna (19), wherein the secondary antenna (18) is configured to be inductively coupled to an antenna (17) of the transponder device

Methodology Applied

Scientific EffectInductive coupling: Electromagnetic Induction

Implementation Method 2

a primary antenna (19) configured for long range communication with an external RFID reader

Methodology Applied

Scientific EffectElectromagnetic radiation:

Data Source

PatentUS10438110B2Multiple frequency transponder with a single antenna

Publication Date: 2019.10.08 ASSA ABLOY AB

AI summary

The present invention concerns a RFID transponder, such as a card, comprising a first chip electrically connected to a first antenna and a second chip electrically connected to a second antenna. The first antenna comprises a secondary antenna which is inductively to the second antenna.