Reverberation Chamber Antenna Holder for Multipath Testing
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Solution Overview
Problem
Current reverberation chambers face challenges in achieving accurate and efficient measurements of device performance, particularly in simulating real-world multipath environments, due to limitations in measurement uncertainty, time-consuming procedures, and the inability to effectively test continuous fading conditions.
Innovation Solution
The implementation of a chamber with inwardly reflective walls and a moveable antenna holder with chamber antennas arranged orthogonally, along with a shield to reduce direct coupling, and the use of a video camera for monitoring and data correlation, enhances measurement accuracy and user controllability, allowing for faster and more precise characterization of device performance in multipath environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional reverberation chamber measurements are used to characterize device performance in multipath environments, then measurement capability is provided, but measurement accuracy is limited due to direct coupling between antennas and inability to simulate continuous fading conditions
Solution Approach 1:
The patent applies the Dynamics principle by implementing a moveable antenna holder that can continuously change positions within the chamber during measurements. This dynamic positioning capability allows the system to simulate continuous fading conditions by exposing the device under test to varying signal paths, thereby improving the reliability of fading simulation while maintaining measurement accuracy through controlled motion.
Solution Approach 2:
The patent applies the Intermediary principle by introducing a moveable antenna holder as an intermediary element between the fixed chamber antennas and the device under test. This intermediary component enables precise control over signal exposure and fading conditions while isolating the measurement process from direct coupling effects, thereby simultaneously improving measurement accuracy and fading simulation reliability.
2Measurement precision
If multiple measurement positions are used to average results for Total Isotropic Sensitivity, then measurement completeness is improved, but measurement time increases significantly
Solution Approach 1:
The patent applies the Continuity of useful action principle by implementing continuous motion of the antenna holder during measurements rather than discrete step-by-step positioning. This continuous action allows the system to collect measurement data across multiple positions simultaneously through time-integrated sampling, thereby maintaining measurement completeness while dramatically reducing the total measurement time required.
Solution Approach 2:
The patent applies the Preliminary action principle by pre-programming the antenna holder's motion trajectory and measurement parameters before actual measurements begin. This preliminary setup optimizes the measurement path to cover all necessary positions efficiently, ensuring measurement completeness is achieved with minimal time loss during the actual measurement process.
3Power
If chamber antennas are positioned close to the device under test to improve signal strength, then signal reception is improved, but direct coupling between antennas increases measurement uncertainty
Solution Approach 1:
The patent applies the Dynamics principle by making the antenna holder moveable rather than fixed, allowing the system to dynamically adjust the distance between chamber antennas and the device under test during measurements. This dynamic positioning enables the system to optimize signal strength at close proximity while periodically changing positions to average out direct coupling effects, thereby maintaining both signal strength and measurement precision.
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 configuration improves measurement accuracy, reduces user-induced errors, and enables faster characterization of device performance, including transmit and receive capabilities, by minimizing direct coupling and optimizing antenna positioning, while providing real-time monitoring and data analysis.
Implementation Method 1
walls of an inwardly reflective material, rendering the walls reflective to electromagnetic waves, thereby simulating a multipath environment
Implementation Method 2
at least one moveable object within the cavity for obtaining a multitude of mode distributions and thereby making the DUT receive a signal that vary strongly with time, commonly referred to as fading
Data Source
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AI summary
Improvements in relation to an apparatus for measuring the performance of a device under test, such as an antenna, a mobile phone and other wireless terminals, are disclosed. The chamber defines an internal cavity therein, adapted to enclose the device under test, and including walls of an inwardly reflective material, rendering the walls reflective to electromagnetic waves, thereby simulating a multi-path environment. Thus, the chamber is a reverberation chamber. At least one moveable object and chamber antenna are arranged in the cavity. A measuring instrument is connected to the device under test and the chamber antenna, for measuring the transmission between them. Further, an improved antenna holder is disclosed, comprising three surfaces of a reflective material, said surfaces extending in planes which are orthogonal in relation to each other and each surface facing away from the other surfaces, and wherein a chamber antenna is arranged on each of said at least three surfaces. Other improvements relate to video surveillance, channel emulation and shielding.