Low-Frequency Electromagnetic Testing With Dual-Grounded Mounting Stand
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Solution Overview
Problem
Existing electromagnetic wave testing devices struggle to achieve uniform electric field strength for radiation immunity tests using low frequency bands within reverberation chambers, limiting their flexibility and effectiveness.
Innovation Solution
An electromagnetic wave testing device with a mounting stand having a flat plate shape and dual grounding parts, connected to a reverberation chamber, to improve electric field uniformity by grounding the mounting stand, using a combination of a reverberation chamber method and a transmission line system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a reverberation chamber is used to generate low frequency electric fields, then the frequency band can be extended below the resonant frequency, but the chamber volume would need to be excessively large (about 10 km dimension)
Solution Approach 1:
The patent combines the reverberation chamber method with a transmission line system (TLS) to create a hybrid testing device. The TLS component (including antenna and grounding structure) is integrated within the reverberation chamber, allowing low frequency testing below the chamber's resonant frequency without requiring the chamber volume to scale proportionally with frequency reduction.
Solution Approach 2:
A transmission line system acts as an intermediary mechanism between the antenna and the test object. This TLS structure enables efficient electromagnetic wave transmission at low frequencies by providing a controlled impedance path, thereby achieving low frequency coverage without requiring the reverberation chamber dimensions to increase excessively.
2Device complexity
If a single grounding connection is used for the mounting stand, then the structure is simple, but the electric field strength distribution becomes non-uniform
Solution Approach 1:
The grounding connection is segmented into multiple independent grounding parts distributed at different locations on the mounting stand. This segmentation allows each grounding part to independently establish equipotential regions, and their combined effect creates a more uniform overall electric field distribution across the test object.
Solution Approach 2:
Multiple grounding parts are strategically positioned to create equipotential surfaces across the mounting stand. By ensuring that different regions of the mounting stand are independently grounded, the system eliminates potential differences that would cause non-uniform electric field distribution, thereby achieving more uniform field strength across the test object.
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
The device enhances electric field strength uniformity, allowing effective radiation immunity tests at low frequencies without the need for excessive power amplification, thus improving test reliability and reducing installation constraints.
Implementation Method 1
an antenna device that emits electromagnetic waves into the inside of the cavity resonator
Implementation Method 2
The reverberation chamber generates an electric field applied to a test object using a resonance phenomenon of electromagnetic waves inside the cavity resonator
Implementation Method 3
an electromagnetic stirrer that stirs the electromagnetic waves emitted from the antenna device
Data Source
AI summary
An electromagnetic wave testing device including: a reverberation chamber; an antenna installed inside the reverberation chamber and emitting electromagnetic waves of frequencies below a resonant frequency of the reverberation chamber; a mounting stand of a flat plate shape having a mounting surface, which is a face including a first side and a second side facing the first side, made of a conductor on which the test object is placed; a first grounding part electrically connecting an object having a ground electric potential and the first side to each other; and a second grounding part electrically connecting the object and the second side to each other.