Wearable Bezel Antenna for NFC Signal Integrity

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Solution Overview

Problem

The integration of NFC antennas in wearable devices with conductive materials is challenging due to reduced Q values caused by out-of-phase eddy currents and losses from display modules and conductive layers, which degrade communication distance.

Innovation Solution

Incorporating a bezel with a conductive or non-conductive material that forms a conductive circuit path with an RF gap, allowing for effective RF signal transmission and reception while minimizing interference, and locating the antenna above the user interface to avoid conductive material-induced losses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If conductive materials (e.g., stainless steel) are used for industrial design, then aesthetic appearance is improved, but antenna performance deteriorates due to reduced Q values caused by out-of-phase eddy currents

Engineering Contradiction:

Improveaesthetic appearanceVSAvoidantenna performance

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The conductive bezel is segmented by introducing RF gaps that divide the continuous conductive path into separate sections. This segmentation prevents the formation of complete eddy current loops, reducing electromagnetic interference with the NFC antenna while preserving the aesthetic appearance of the conductive material.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bezel structure transitions from uniformly conductive to having localized non-conductive regions (RF gaps) at specific positions. This local modification of electrical properties allows the majority of the bezel to maintain its aesthetic conductive appearance while specific regions are optimized to minimize interference with antenna operation.

Inventive Principle:

Principle #3Local quality

2Device complexity

If antenna is integrated below display module, then device structure is simplified, but communication distance deteriorates due to losses from display module and conductive layers

Engineering Contradiction:

Improvedevice structureVSAvoidcommunication distance

Core Design Contradiction:

Device complexityVSLength of stationary object

Solution Approach 1:

Instead of placing the NFC antenna below the display module (conventional approach), the patent inverts the arrangement by positioning the antenna above the display module, integrated into the conductive bezel structure. This inversion removes the antenna from the lossy environment of conductive layers and display modules, improving communication distance while maintaining structural integration.

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If continuous conductive circuit path is used in bezel, then manufacturing is simplified, but RF signal transmission deteriorates due to eddy current losses

Engineering Contradiction:

Improvebezel manufacturingVSAvoidRF signal transmission

Core Design Contradiction:

Ease of manufactureVSLoss of energy

Solution Approach 1:

The continuous conductive circuit path is divided into segmented paths by introducing RF gaps. This segmentation maintains ease of manufacture through standard bezel fabrication processes while preventing complete eddy current loops, thereby reducing energy losses and improving RF signal transmission for NFC communications.

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 enhances NFC antenna performance by maintaining communication distance and functionality while maintaining a sleek design, reducing the impact of conductive materials on antenna integration.

Implementation Method 1

a conductive circuit path to transmit and receive radiofrequency (RF) signals to and from the wearable device

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

reduced Q values caused by out-of-phase eddy currents

Methodology Applied

Scientific EffectEddy currents: Eddy Currents

Data Source

PatentUS10879596B2Antenna for wearable devices methods, apparatuses, and systems

Publication Date: 2020.12.29 INTEL CORP

AI summary

Embodiments include apparatuses, methods, and systems for an antenna for a wearable device that includes a bezel on the wearable device to include a conductive circuit path to transmit and receive radiofrequency (RF) signals to and from the wearable device. In some embodiments, the bezel may be formed of a substantially conductive material to form the conductive circuit path. In other embodiments the bezel may be formed of a substantially non-conductive material and may include a conductive antenna pattern located on a surface of the bezel to form the conductive circuit path. Other embodiments may also be described and claimed.