Mode Stirrer Configurations for Electromagnetic Wave Uniformity

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Solution Overview

Problem

Existing electromagnetic wave reverberation chambers face challenges in maintaining electromagnetic wave uniformity, which is crucial for accurate measurement of electromagnetic interference and radiated immunity, often requiring large and costly anechoic chambers, and existing solutions do not effectively increase eigenmode shift to reduce standard deviation in electromagnetic fields.

Innovation Solution

The design incorporates various mode stirrers such as column-type, ceiling-type, pyramidal, and concavo-convex mode stirrers with optimized physical parameters like size, shape, and installation location to increase eigenmode shift and improve electromagnetic wave uniformity within the reverberation chamber.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an anechoic chamber is used for measuring EMI and RI, then measurement accuracy is improved, but space occupation and cost increase significantly

Engineering Contradiction:

ImproveEMI and RI measurement accuracyVSAvoidchamber space occupation

Core Design Contradiction:

Measurement precisionVSArea of stationary object

Solution Approach 1:

The patent transforms the anechoic chamber into a reverberation chamber by changing the electromagnetic wave interaction parameters - from absorption to reflection. This parameter change allows the same space to achieve measurement capabilities with different physical principles, reducing space requirements while maintaining measurement accuracy for EMI and RI testing

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a virtual anechoic environment through computational methods in a compact physical space. By using mode stirrers to generate diverse electromagnetic field distributions and applying signal processing techniques, the system replicates the measurement capabilities of large anechoic chambers in a much smaller reverberation chamber

Inventive Principle:

Principle #26Copying

2Reliability

If electromagnetic wave uniformity is improved in reverberation chamber, then measurement reliability is improved, but device complexity increases due to multiple mode stirrers

Engineering Contradiction:

Improveelectromagnetic wave uniformityVSAvoidmode stirrer configuration

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the electromagnetic field control function into multiple independent mode stirrers with different configurations (column-type, ceiling-type, pyramidal, concavo-convex). Each mode stirrer segment handles specific spatial regions or field distributions, and their combined operation achieves comprehensive electromagnetic wave uniformity throughout the chamber

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs multiple mode stirrers that can independently rotate or move to dynamically change the electromagnetic field distribution. This dynamic operation allows the system to generate diverse field patterns and achieve time-averaged uniformity, improving reliability while managing complexity through coordinated control

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If eigenmode shift is increased to reduce standard deviation, then electromagnetic wave uniformity is improved, but the number and complexity of mode stirrers increase

Engineering Contradiction:

Improveelectromagnetic field distribution precisionVSAvoidmode stirrer quantity and configuration

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent employs mode stirrers with asymmetric geometries (pyramidal shapes, concavo-convex surfaces) that create non-uniform field distributions which, when combined and time-averaged, produce superior overall uniformity. The asymmetric designs generate larger eigenmode shifts compared to symmetric configurations, improving field precision while using fewer components

Inventive Principle:

Principle #4Asymmetry

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 enhances electromagnetic wave uniformity by increasing eigenmode shift, reducing standard deviation in electromagnetic fields, and improving the overall performance of the reverberation chamber, making it more efficient and cost-effective for measuring electromagnetic compatibility.

Implementation Method 1

a column-type mode stirrer including a plurality of plate-shaped electromagnetic wave reflectors connected by a metal column provided on a bottom of the electromagnetic wave reverberation chamber

Methodology Applied

Scientific EffectElectromagnetic wave reflection: Reflection

Data Source

PatentUS10598711B2Electromagnetic wave reverberation chamber

Publication Date: 2020.03.24 ELECTRONICS & TELECOMM RES INST

AI summary

Disclosed is an electromagnetic wave reverberation chamber including a column-type mode stirrer including a plurality of plate-shaped electromagnetic wave reflectors connected by a metal column provided on a bottom of the electromagnetic wave reverberation chamber, a ceiling-type mode stirrer including a plurality of plate-shaped electromagnetic wave reflectors connected by a metal column provided on a wall surface of the electromagnetic wave reverberation chamber and disposed around a ceiling of the electromagnetic wave reverberation chamber, and a pyramidal mode stirrer including a plurality of pyramid-shaped electromagnetic wave reflectors and disposed on a wall surface of the electromagnetic wave reverberation chamber.