RFID Circuitry Embedded in Flexible Circuits for RF Shielding

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Solution Overview

Problem

RFID circuitry integrated into electronic devices often occupies valuable space and causes radio frequency interference, reducing the operating efficiency of these devices.

Innovation Solution

Integrating RFID circuitry into flexible circuits, where the RFID circuit can be embedded within a dielectric layer or between conductive and dielectric layers, with RF shielding via insulation vias to minimize interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If RFID circuitry is integrated into electronic components, then identification and tracking functionality is provided, but valuable space is occupied and RF interference occurs

Engineering Contradiction:

Improveidentification and tracking functionalityVSAvoidspace occupied in electronic component

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent merges the RFID circuitry with the flexible circuit board by integrating the RFID antenna pattern into the ground layer of the flexible circuit and incorporating RFID circuit elements into the signal layers. This consolidation eliminates the need for separate RFID components, thereby providing identification and tracking functionality while minimizing additional space occupation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent utilizes the third dimension by embedding RFID circuitry within the multi-layer structure of the flexible circuit board. The RFID antenna is formed in the ground layer while circuit elements are integrated in signal layers above, effectively using vertical space within the existing circuit board thickness rather than requiring additional lateral space.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If RFID circuitry is integrated into electronic components, then identification and tracking functionality is provided, but RF interference affects operation of electronic components

Engineering Contradiction:

Improveidentification and tracking functionalityVSAvoidRF interference

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by creating an insulated via specifically adjacent to the RFID circuitry to provide localized RF shielding. This targeted approach shields only the critical areas from RF interference while maintaining the overall functionality of the flexible circuit board, rather than requiring comprehensive shielding of the entire structure.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces an insulated via as an intermediary element between the RFID circuitry and other signal traces on the flexible circuit board. This intermediary structure acts as a barrier that blocks RF interference from propagating to other circuit elements, thereby protecting the operation of electronic components while allowing the RFID functionality to operate.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Area of stationary object

If RFID circuitry is integrated into flexible circuits, then space usage is optimized, but RF shielding is required to minimize interference

Engineering Contradiction:

Improvespace usage in electronic deviceVSAvoidRF shielding requirements

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The flexible circuit board structure itself provides RF shielding through its inherent ground layer and signal layer configuration. The ground layer acts as a reference plane that naturally shields RFID signals, and the insulated via adjacent to the RFID circuitry provides additional localized shielding. This self-service approach utilizes the existing circuit board structure for shielding purposes, minimizing the need for additional external shielding components.

Inventive Principle:

Principle #25Self-service

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 approach allows for efficient integration of RFID circuitry into electronic devices, reducing space usage and minimizing RF interference, thereby enhancing the operating efficiency of these devices.

Implementation Method 1

Portions of the flexible circuit may provide RF shielding for signals radiated by the RFID circuitry

Methodology Applied

Scientific EffectRF shielding: Faraday Cage

Implementation Method 2

positioning the RFID circuitry between insulation vias and the flexible circuit to radiate RF signals out of the circuit

Methodology Applied

Scientific EffectRF signal radiation: Electromagnetic Induction

Data Source

PatentUS8978988B2Systems and methods for integrating radio-frequency identification circuitry into flexible circuits

Publication Date: 2015.03.17 APPLE INC

AI summary

Systems and methods for integrating radio-frequency identification (RFID) circuitry into flexible circuits are provided. An RFID integrated circuit can be embedded within a dielectric layer of a flexible circuit or between a dielectric layer and a conductive layer of the flexible circuit. Additionally or alternatively, an RFID antenna may be integrated into a conductive layer of the flexible circuit. Alternatively, both the integrated circuit and antenna of RFID circuitry may be provided off of the flexible circuit but an RFID connector coupling the integrated circuit and antenna may be integrated into the flexible circuit.