Nested RF Measurement Chamber for Simultaneous Multipath and Anechoic Testing
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Solution Overview
Problem
Current test equipment is inadequate for simultaneously measuring antenna system performance in both multipath and line-of-sight dominated propagation environments, particularly at different frequency bands, as most Reverberation Chambers are not suitable for higher frequencies and require costly and time-consuming conversions to assess performance in line-of-sight environments.
Innovation Solution
A measurement device with an outer chamber having radio frequency reflective walls and an inner chamber with absorptive walls, allowing for simultaneous testing in reflective and anechoic environments using separate test antenna arrangements, with the absorptive walls providing transparency in lower frequency bands and high attenuation in higher frequency bands, enabling efficient generation of rich isotropic multipath and line-of-sight channel characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radio frequency absorptive walls are added to create anechoic environment, then measurement accuracy in high frequency bands is improved, but signal transparency in lower frequency bands deteriorates
Solution Approach 1:
The absorptive walls are specifically implemented in the inner chamber to provide anechoic conditions for high-frequency measurements, while the outer chamber maintains reflective walls for multipath measurements. This localized application of absorption ensures high measurement accuracy in the intended frequency range without compromising lower frequency signal transparency where needed.
Solution Approach 2:
The measurement system changes the electromagnetic environment parameters by selecting different chambers for different frequency bands. The inner chamber with absorptive walls is activated for high-frequency line-of-sight measurements, while the outer chamber is used for lower-frequency multipath measurements, optimizing performance for each frequency range.
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
Enables cost-effective and time-efficient simultaneous measurement of antenna systems in both multipath and line-of-sight environments across various frequency bands, improving measurement accuracy and resolution by reducing the impact of absorptive walls on lower frequency bands while maintaining anechoic properties in higher frequency bands.
Implementation Method 1
the inner chamber 140 has radio frequency absorptive walls 141 configured to enclose the antenna system 110
Implementation Method 2
an outer chamber 120 having inwardly radio frequency reflective walls 121 configured to enclose the antenna system 110
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
A measurement device for measuring performance of at least one antenna system (110) in a first frequency band and in a second frequency band. The measurement device comprising an outer chamber (120) having inwardly radio frequency reflective walls (121) configured to enclose the antenna system (110), an inner chamber (140) deployable inside the outer chamber (120), the inner chamber (140) having radio frequency absorptive walls (141) configured to enclose the antenna system (110), a first test antenna arrangement (130) arranged inside the outer chamber (120) and configured for a measurement operation (131) in the first frequency band, and a second test antenna arrangement (150) arranged inside the inner chamber (140) and configured for a measurement operation (151) in the second frequency band, thereby enabling measuring performance of the antenna system (110) in a reflective radio frequency environment by the first test antenna arrangement (130) and measuring performance in an essentially anechoic radio frequency environment by the second test antenna arrangement (150).