Variable Absorbing Structure for Reverberation Chamber Loading
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Solution Overview
Problem
Reverberation chambers face challenges in providing a realistic test environment for simulating real-world electromagnetic or acoustic propagation conditions due to their high Q factor, which results in non-uniform energy distribution and inability to selectively load for specific temporal behaviors, such as RMS delay spread and power delay profile, making it difficult to replicate real-world multipath environments.
Innovation Solution
A variable absorbing structure is introduced within the reverberation chamber, comprising reflective and absorbing materials that can be selectively exposed to control energy absorption and reflection, allowing for repeatable, controllable, and variable loading to adjust the RMS delay spread, power delay profile, and uniformity of energy distribution, by positioning and orienting the absorbing structure to achieve specific performance parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a reverberation chamber uses highly reflective walls and ceiling to maintain high Q factor, then energy is preserved and stored in the chamber, but the energy distribution becomes non-uniform and the chamber cannot selectively load for specific temporal behaviors
Solution Approach 1:
The patent introduces a variable absorbing structure with adjustable reflective shields that can dynamically change the amount of absorbing material exposed to electromagnetic energy. This dynamic adjustment capability allows the chamber to transition between high Q factor mode (for energy preservation) and selective loading mode (for specific temporal behaviors), resolving the contradiction between energy preservation and adaptability.
Solution Approach 2:
The patent changes the parameter of energy absorption by adjusting the exposure of absorbing material through movable reflective shields. By varying the amount of absorbing material exposed, the chamber can control the loading level and achieve different temporal behaviors (such as different RMS delay spreads) while maintaining the ability to preserve energy when needed, thus resolving the contradiction between energy preservation and selective loading capability.
2Adaptability or versatility
If absorbing material is added to the reverberation chamber to achieve selective loading, then specific temporal behaviors can be controlled, but the uniformity of energy distribution deteriorates
Solution Approach 1:
The patent applies absorbing material locally rather than uniformly throughout the chamber. The variable absorbing structure allows absorbing material to be exposed only in specific locations and to specific degrees, enabling selective loading for temporal behavior control while minimizing disruption to the overall uniformity of energy distribution in the chamber.
Solution Approach 2:
The patent uses adjustable reflective shields to dynamically control the exposure of absorbing material. This dynamic adjustment allows the chamber to achieve specific temporal behaviors (such as controlling RMS delay spread) while maintaining control over the degree of uniformity disruption, resolving the contradiction between temporal behavior control and energy distribution uniformity.
3Use of energy by moving object
If the reverberation chamber maintains high Q factor for energy storage, then energy efficiency is improved, but the ability to simulate real-world propagation conditions with specific RMS delay spread and power delay profile is reduced
Solution Approach 1:
The patent changes the energy absorption parameter by adjusting the variable absorbing structure. This allows the chamber to operate at high Q factor for energy efficiency when needed, or to introduce controlled absorption for simulating real-world propagation conditions with specific temporal characteristics such as RMS delay spread and power delay profile, thus resolving the contradiction between energy efficiency and simulation capability.
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 solution enables the creation of a controlled and repeatable test environment that can simulate real-world propagation conditions by selectively reducing energy in specific directions and polarizations, allowing for precise adjustment of the RMS delay spread and power delay profile without altering the uniformity of the field distribution, thus enhancing the realism of the test environment.
Implementation Method 1
The absorbing material is at least partially shielded by the reflective material. The reflective material is adjustable to expose at least a portion of the absorbing material.
Implementation Method 2
In an electromagnetic reverberation chamber, the walls, ceiling and floor are generally metallic and highly reflective of electromagnetic energy.
Data Source
AI summary
A method and system for selectively varying the performance of a test chamber are disclosed. According to one aspect, the performance is affected by a variable absorbing structure of the test chamber. The absorbing structure enables selective exposure of absorbing material to achieve a specific performance.