Wireless Antenna Shield Layout for RF Desensitization Mitigation

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Solution Overview

Problem

Mobile computing devices face interference issues due to overlapping operating frequencies among different communications assemblies, particularly when wired and wireless communications assemblies are deployed in close proximity, leading to reduced performance and connectivity.

Innovation Solution

Employing a magnetically permeable electromagnetic shield adjacent to the wired communications assembly, which carries an NFC antenna, to shield other wireless antennas from electromagnetic noise generated by the wired assembly, utilizing a magnetically permeable material like ferrite to attenuate the magnetic field strength of interfering noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If wired and wireless communications assemblies are deployed in close proximity to save space, then device compactness is improved, but electromagnetic interference between assemblies increases

Engineering Contradiction:

Improvedevice compactnessVSAvoidelectromagnetic interference

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

An electromagnetic shield is introduced as an intermediary component between the wired communications assembly and wireless communications assemblies. The shield acts as a mediator that blocks electromagnetic noise from the wired assembly from interfering with the wireless assemblies, allowing them to be positioned in close proximity while maintaining signal integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The device interior is segmented into distinct electromagnetic zones using shields and barriers. The wired communications assembly is isolated from wireless assemblies through physical partitioning with electromagnetic shielding materials, creating separate operational zones that prevent mutual interference while maintaining compact overall device volume.

Inventive Principle:

Principle #1Segmentation

2Reliability

If electromagnetic shields are added to mitigate interference, then wireless communications performance is improved, but device complexity increases

Engineering Contradiction:

Improvewireless communications performanceVSAvoidassembly complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The electromagnetic shield serves multiple functions simultaneously: it provides electromagnetic shielding for wireless communications, acts as a structural support element, and can be integrated with existing device components. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in overall device complexity while maintaining improved wireless performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If multiple communications assemblies are integrated to provide diverse connectivity, then communication versatility is improved, but interference between assemblies increases

Engineering Contradiction:

Improvecommunication versatilityVSAvoidinterference between assemblies

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

Electromagnetic shields are positioned between different communications assemblies (wired and wireless) to act as intermediaries that prevent harmful electromagnetic emissions from one assembly from interfering with another. This allows multiple communication types to coexist in close proximity, maintaining both versatility and signal integrity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Different regions of the device are assigned different electromagnetic shielding properties based on the specific communication assemblies present. Areas with wireless assemblies receive enhanced shielding from wired assemblies, while the wired assembly area may have different shielding requirements. This localized approach to shielding optimizes interference mitigation across diverse communication functionalities.

Inventive Principle:

Principle #3Local quality

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

Effectively mitigates electromagnetic interference, enhancing the performance and connectivity of wireless communications assemblies while minimizing manufacturing complexity and cost.

Implementation Method 1

the electromagnetic shield configured to shield the first antenna from electromagnetic noise generated by the wired communications assembly

Methodology Applied

Scientific EffectMagnetic field attenuation: Magnetic Field

Implementation Method 2

utilizing a magnetically permeable material like ferrite to attenuate the magnetic field strength of interfering noise

Methodology Applied

Scientific EffectFerromagnetism: Ferromagnetism

Data Source

PatentUS12489483B2Wireless communications assemblies for mitigating radio frequency desensitization

Publication Date: 2025.12.02 ZEBRA TECHNOLOGIES CORP

AI summary

A computing device includes: a housing having a plurality of outer walls; a first wireless communications assembly supported within the housing and including a first antenna; a wired communications assembly supported within the housing and including a port on one of the outer walls, the port configured to connect with another device; and a second wireless communications assembly supported within the housing and including a second antenna affixed to an electromagnetic shield disposed adjacent to the port of the wired communications assembly, the electromagnetic shield configured to shield the first antenna from electromagnetic noise generated by the wired communications assembly.