Combined EAS RFID Tag Shared Capacitor Antenna

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Solution Overview

Problem

Existing combined Electronic Article Surveillance (EAS) and Radio Frequency Identification (RFID) tags are oversized due to the separation of EAS and RFID elements, which increases the tag size despite efforts to minimize interactions between them.

Innovation Solution

The EAS and RFID circuits share common components, such as a capacitor, where at least one capacitor plate of the EAS circuit forms part of the RFID circuit's main antenna, reducing the overall size of the tag while maintaining performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If EAS and RFID elements are placed far apart to minimize interactions, then interference between elements is reduced, but the tag size increases

Engineering Contradiction:

Improveelement interaction minimizationVSAvoidtag size

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The patent merges the EAS capacitor and RFID antenna into a single shared component structure. The capacitor plates of the EAS circuit are configured to simultaneously form the antenna elements of the RFID circuit, allowing both functions to coexist in a compact arrangement without requiring separate dedicated spaces for each element.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The capacitor structure serves dual functions: it acts as the energy storage element for the EAS resonator while simultaneously functioning as the radiating antenna for the RFID transceiver. This multi-functionality eliminates the need for separate components and reduces overall tag footprint.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If separate EAS and RFID circuits are used, then functional independence is maintained, but the overall tag complexity and size increase

Engineering Contradiction:

Improvefunctional independenceVSAvoidcircuit configuration

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple circuit functions into shared physical structures. The EAS resonator circuit and RFID transceiver circuit both utilize the same capacitor plates and substrate infrastructure, reducing the total component count while preserving the functional independence needed for both EAS anti-theft and RFID inventory tracking operations.

Inventive Principle:

Principle #5Merging (Combining)

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 allows for a compact combined EAS/RFID tag that effectively tracks inventory and secures articles, improving productivity and deterring shoplifting without increasing size, thus addressing the issue of oversized tags.

Implementation Method 1

The EAS circuit having at least one capacitor and said RFID circuit having a main antenna wherein at least a part of said capacitor of said EAS circuit provides at least a part of said main antenna of said RFID circuit

Methodology Applied

Scientific EffectElectromagnetic resonance: Resonance

Data Source

PatentUS8056814B2Combined EAS/RFID tag

Publication Date: 2011.11.15 DIGITAL TAGS SAS

AI summary

A combined EAS/RFID tag including an EAS circuit and a first RFID circuit is disclosed. The EAS circuit has at least one capacitor and the RFID circuit has a main antenna wherein at least a part of the capacitor of the EAS circuit provides at least a part of the main antenna of the RFID circuit. The EAS circuit may include two capacitors and each capacitor may include first and second plates on first and second sides of a substrate wherein one plate of each capacitor forms part of the main antenna of the RFID circuit.