RF Transceiver Shielding Efficiency Testing Method

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Solution Overview

Problem

Increasing integration of multiple radio systems in communication devices leads to interference issues, affecting signal quality and requiring effective shielding efficiency testing to prevent unwanted signal leaks and degradation of radio subsystem performance.

Innovation Solution

A method and apparatus for testing RF shielding efficiency by inputting a modulated signal to a receiver signal path, demodulating it, measuring signal quality, and quantitatively assessing shielding effectiveness, which can be implemented using a computer-readable medium or a digital signal generation block within a radio subsystem, allowing for dynamic operational condition assessment and interference detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple radio systems are integrated into a single device, then the functionality and versatility of the device are improved, but interference between radio systems increases and signal quality deteriorates

Engineering Contradiction:

ImprovefunctionalityVSAvoidinterference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The device is divided into separate radio subsystems, each handling specific frequency bands or communication protocols. This segmentation isolates interference sources and allows independent optimization of each subsystem, reducing mutual interference while maintaining overall functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different shielding and filtering measures are applied to specific radio subsystems based on their individual interference characteristics. Rather than uniform protection, each subsystem receives targeted shielding appropriate to its frequency range and interference profile, optimizing protection while minimizing impact on signal quality.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If shielding is added to prevent signal leakage and interference, then interference protection is improved, but device complexity and manufacturing difficulty increase

Engineering Contradiction:

Improveinterference protectionVSAvoidshielding structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Shielding structures are nested within the device housing, with internal shields positioned within external shields. This nested arrangement provides multiple layers of protection against interference while utilizing the existing device form factor, avoiding significant increases in overall device size or manufacturing complexity.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

Filtering components and isolation elements are introduced as intermediary structures between interfering radio subsystems. These intermediaries selectively block harmful frequencies while allowing desired signals to pass, providing interference protection without requiring extensive structural modifications to the device.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If traditional shielding methods are used without quantitative assessment, then shielding implementation is simplified, but shielding efficiency and signal quality cannot be accurately determined

Engineering Contradiction:

Improveshielding implementationVSAvoidshielding efficiency

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

A feedback mechanism is implemented that measures the actual shielding performance of radio subsystems and uses this information to adjust shielding configurations. This feedback loop enables quantitative assessment of shielding efficiency and allows optimization of shielding structures based on measured performance rather than theoretical calculations alone.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The shielding assessment system varies key parameters such as shielding material properties, thickness, and positioning to evaluate their impact on shielding efficiency. By systematically changing these parameters and measuring the resulting signal quality, the system identifies optimal shielding configurations that balance protection effectiveness with manufacturing feasibility.

Inventive Principle:

Principle #35Parameter changes

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 enables accurate determination of shielding efficiency, preventing interference and maintaining signal quality by identifying and addressing potential interference sources within the radio subsystem, thereby ensuring optimal performance of transceivers and receivers.

Implementation Method 1

A shield acts like a Faraday gage, which prevents an unwanted signal radiation out or coming inside the shield.

Methodology Applied

Scientific EffectFaraday cage: Faraday Cage

Data Source

PatentUS8086185B2Qualify method for shielding of transceiver RF block

Publication Date: 2011.12.27 NOKIA TECHNOLOGIES OY

AI summary

A method is provided for inputting a signal that is modulated at a predetermined frequency to a receiver signal path of a radio subsystem and demodulating the signal at the predetermined frequency as it passes through the receiver signal path, measuring signal quality of the demodulated signal, and quantitatively assessing shielding of the radio subsystem with the measured signal.