Ellipsoid Reflecting Surface Wireless Terminal Testing System
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Solution Overview
Problem
Current wireless terminal testing systems are inefficient due to low test speed, high manufacturing costs, and limited application scope, primarily because they require a large distance between the test antenna and device under test, necessitating a huge volume and complex setups like the great circle test method.
Innovation Solution
A system utilizing a reflecting ellipsoid with a device under test and test antenna at its foci, along with an absorbing screen and reflecting surfaces to achieve in-phase superposition and power combining of radiation signals, reducing the need for a base station simulator and allowing for a smaller, more cost-effective setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the great circle test method is used with a three dimensional turntable and multiple test antennas, then radiation signals in all directions can be measured, but the test speed is low and the system volume is huge
Solution Approach 1:
A reflecting ellipsoid is introduced as an intermediary component to redirect and concentrate radiation signals from the device under test to the test antenna. The ellipsoid acts as a mediator that transforms the spatial distribution of radiation into a concentrated signal at the test antenna location, eliminating the need for multiple antennas and complex rotation mechanisms while maintaining measurement completeness
Solution Approach 2:
The patent transforms the three-dimensional measurement problem into a two-dimensional solution by using the reflecting ellipsoid surface to redirect signals from all spatial directions to a single test antenna position. This dimensional transformation allows complete radiation pattern measurement without requiring physical movement or multiple antenna positions
2Measurement precision
If the distance between test antenna and device under test is increased to exceed far field distance, then radiation measurement accuracy is improved, but the system volume becomes huge
Solution Approach 1:
The reflecting ellipsoid serves as a mediator that enables the test antenna to be positioned close to the device under test while still achieving accurate radiation measurement. The ellipsoid redirects signals from the device to the antenna, maintaining measurement accuracy without requiring the antenna to be far from the device, thus reducing system volume
Solution Approach 2:
The patent employs a reflecting ellipsoid with specific curved geometry to redirect radiation signals. The curved surface of the ellipsoid is designed to concentrate signals from all directions to the test antenna position, enabling accurate measurement at reduced distances and minimizing the overall system volume
3Measurement precision
If multiple test antennas and absorbing materials are used in an anechoic chamber, then radiation signals can be measured in all directions, but the manufacturing cost is high
Solution Approach 1:
The reflecting ellipsoid is a simpler, more cost-effective intermediary compared to using multiple test antennas and complex anechoic chamber structures. It achieves the same measurement capability with fewer components, lower manufacturing complexity, and reduced material costs while maintaining omnidirectional measurement precision
Solution Approach 2:
The patent extracts and eliminates the need for multiple test antennas and extensive absorbing materials from the measurement system. By using the reflecting ellipsoid to concentrate signals, the system requires only a single test antenna and minimal absorbing materials, significantly reducing manufacturing cost and complexity
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 approach simplifies operations, improves test efficiency, reduces repeatability errors, and stabilizes results while enabling a wider range of applications with a smaller, less expensive test system.
Implementation Method 1
a reflecting surface configured to reflect wireless signals emitted by the device under test
Implementation Method 2
an absorbing screen configured to absorb a direct signal emitted from the device under test to the test antenna
Data Source
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Figure 5
AI summary
Provided is a wireless terminal testing system, said wireless terminal testing system comprising: a device to be tested, said device to be tested being a wireless terminal; a test antenna; a test antenna; an absorbing screen, used for absorbing radio waves; a controller, connected to said device to be tested, and used for controlling said device to be tested to send a wireless signal; a power measurement device, used for measuring the power of the wireless signal received by said test antenna; the positional relationship of the device to be tested, the test antenna, and the reflective surface corresponds to a single ellipsoidal plane, wherein said device to be tested and said test antenna are arranged at two foci of the same ellipsoidal plane and said reflective surface is arranged on said ellipsoidal plane; the absorbing screen is arranged on the straight line between the device to be tested and the test antenna. The wireless terminal testing system improves testing efficiency and reduces costs.