Dual Frequency RFID Memory Segmentation for UHF Sensitivity

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Solution Overview

Problem

The existing dual frequency RFID devices have a low sensitivity UHF interface due to a single non-volatile memory being shared by both HF and UHF interfaces, leading to higher power consumption and shorter communication distances for UHF communication.

Innovation Solution

A dual frequency RFID device with separate non-volatile memories for HF and UHF protocols, where the first memory is powered for UHF communication and the second memory is activated only when sufficient power is available, allowing for efficient power management and extended communication modes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single non-volatile memory is shared by both HF and UHF interfaces, then device complexity is reduced and ease of manufacture is improved, but UHF interface sensitivity deteriorates and communication distance is reduced

Engineering Contradiction:

Improvememory structureVSAvoidUHF interface sensitivity

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent divides the single non-volatile memory into two separate non-volatile memories: a first non-volatile memory dedicated to UHF protocol operations and a second non-volatile memory dedicated to HF protocol operations. This segmentation allows each interface to access its own memory independently, eliminating the power consumption and performance degradation caused by sharing a single memory resource between HF and UHF interfaces.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If a single non-volatile memory is activated for UHF protocol, then device complexity is reduced, but power consumption increases and communication distance is reduced

Engineering Contradiction:

Improvememory activation controlVSAvoidpower consumption

Core Design Contradiction:

Device complexityVSUse of energy by moving object

Solution Approach 1:

The patent segments the non-volatile memory access by protocol type, allowing the UHF interface to access only the first non-volatile memory and the HF interface to access only the second non-volatile memory. This eliminates the need to activate a large shared memory for UHF operations, significantly reducing power consumption and enabling longer communication distances.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Each protocol interface has dedicated memory access rights and characteristics: the UHF interface has access to the first non-volatile memory with optimized for UHF operations, while the HF interface has access to the second non-volatile memory with optimized for HF operations. This local quality approach ensures that each interface operates with appropriate memory resources without the overhead of shared memory activation.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If a single non-volatile memory is shared between HF and UHF interfaces, then manufacturing simplicity is improved, but UHF communication distance is reduced

Engineering Contradiction:

Improvememory configurationVSAvoidcommunication distance

Core Design Contradiction:

Ease of manufactureVSLength of stationary object

Solution Approach 1:

The patent implements separate non-volatile memories for HF and UHF protocols, allowing each interface to operate with its dedicated memory resources. This segmentation enables the UHF interface to achieve optimal communication distance without being constrained by the power consumption and performance limitations of a shared memory architecture.

Inventive Principle:

Principle #1Segmentation

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 efficient communication with both HF and UHF readers by optimizing power usage, extending communication distances, and allowing for different access levels to memory based on available power, thereby improving the overall performance of the UHF interface.

Implementation Method 1

an HF antenna for receiving an HF electromagnetic field

Methodology Applied

Scientific EffectElectromagnetic field reception: Electromagnetic Induction

Implementation Method 2

an UHF antenna for receiving an UHF electromagnetic field

Methodology Applied

Scientific EffectElectromagnetic field reception: Electromagnetic Induction

Implementation Method 3

a power generator and a power management unit

Methodology Applied

Scientific EffectElectromagnetic energy conversion: Electromagnetic Induction

Data Source

PatentUS9542631B2Dual frequency HF-UHF identification device, in particular of the passive type

Publication Date: 2017.01.10 EM MICROELECTRONIC-MARIN

AI summary

The dual frequency RF identification device comprises an HF antenna for receiving an HF electromagnetic field, an HF interface, an UHF antenna for receiving an UHF electromagnetic field, an UHF interface, non-volatile memory means formed by a first non-volatile memory and a second non-volatile memory. The first non-volatile memory can be in an active state without the second non-volatile memory being powered and consumes substantially more power than this second non-volatile memory. The first non-volatile memory comprises all data needed for a device configuration allowing this device to carry out at least a communication mode of an UHF protocol, this communication mode having access to the first non-volatile memory but not to the second non-volatile memory. The first non-volatile memory further comprises all attributes needed for a configuration of this communication mode.