Conductive Plane Positioning for EMI Measurement Accuracy
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Solution Overview
Problem
Existing EMI measurement technologies require a grounded conductive plane and a consistent distance to the equipment under test, which is challenging in environments without good grounding and can lead to measurement errors due to varying distances.
Innovation Solution
A method and device that position a conductive plane relative to the equipment under test by using a positioning object, allowing the conductive plane to be non-grounded and connected to a Protective Earthing wire or not at all, ensuring consistent distance and eliminating grounding requirements, with adjustable positioning for various shapes and sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a grounded conductive plane is used for EMI measurement, then measurement accuracy is improved, but the requirement for good grounding environment increases device complexity and limits adaptability to field settings
Solution Approach 1:
The patent introduces a positioning object as an intermediary between the conductive plane and the EUT. This positioning object has a measurable thickness that can be precisely controlled, serving as a mediator to establish and maintain the required distance relationship without direct contact between the conductive plane and EUT, thereby enabling accurate field measurements without requiring good grounding environments
Solution Approach 2:
The patent changes the grounding parameter from traditional grounded conductive plane to non-grounded conductive plane with controlled distance positioning. By changing the grounding state parameter and introducing distance as a controllable parameter through the positioning object, the system achieves EMI measurement capability in field settings without good grounding while maintaining measurement accuracy
2Reliability
If the distance between conductive plane and EUT is kept unchanged for repeated tests, then measurement consistency is improved, but positioning precision becomes more difficult to maintain
Solution Approach 1:
The patent applies preliminary action by pre-setting the distance relationship between the conductive plane and EUT through the positioning object before measurements are taken. The positioning object with measurable thickness is prepared in advance with known dimensions, allowing the distance to be predetermined and maintained consistently across repeated tests without requiring high-precision positioning during actual measurements
Solution Approach 2:
The patent replaces the mechanical positioning system with a measurement-based system. Instead of relying on mechanical precision to maintain distance, the invention uses the measurable thickness of the positioning object as a reference standard, substituting mechanical positioning precision with dimensional measurement and calculation to achieve consistent positioning
Data Source
AI summary
A method and apparatus for configuring a conductive plane for electromagnetic compatibility test of equipment or device. A positioning object is fixed above the plane of a conductive plane, the positioning object contacts an equipment under test (EUT), and the distance from the EUT to the conductive plane is equal to the distance from the positioning object to the conductive plane plus the thickness of the positioning object, thereby avoiding an error in measurement caused by a change in the distance from the conductive plane to the EUT during each test. In addition, the device is portable, and the conductive plane does not need to be grounded, and may be applied to a production site or field in which no grounding is available.