Phased Array Antenna Testing Isolation Matrix
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Solution Overview
Problem
Phased array antenna testing is time-consuming and expensive due to the need for large test facilities and is prone to errors, especially when trying to isolate and calibrate individual radiating elements within the array, as traditional methods fail to accurately measure impedance and identify faulty elements.
Innovation Solution
A test system with an isolation matrix and X-Y grid structure that isolates individual antenna elements using tuned coupling elements and a Z-axis radiation blocker, allowing for high element-to-element isolation and automated testing without the need for physical connectors or specialized facilities, enabling precise gain and phase measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If far-field range testing is used, then measurement accuracy is improved, but testing time and facility cost increase significantly
Solution Approach 1:
The patent uses near-field testing with mathematical transformation to copy the far-field measurement results. Instead of physically moving to a far-field range, the system captures near-field data and transforms it computationally to obtain equivalent far-field parameters, thereby achieving accurate measurements without the time and facility requirements of actual far-field testing
Solution Approach 2:
The patent transforms the measurement problem from three-dimensional far-field space to a two-dimensional near-field plane measurement. By measuring electromagnetic fields in the near-field region (closer to the antenna) and applying mathematical transformations, the system obtains far-field radiation patterns without requiring the large physical distances of traditional far-field ranges
2Loss of time
If near-field range testing is used, then testing time and facility cost are reduced, but measurement accuracy and calibration complexity increase
Solution Approach 1:
The patent replaces complex mechanical calibration procedures with automated computational algorithms. Instead of manually calibrating the near-field range with precise mechanical adjustments, the system uses software-based mathematical transformations to convert near-field measurements into accurate far-field equivalents, eliminating the need for tedious manual calibration while maintaining measurement accuracy
Solution Approach 2:
The patent introduces mathematical transformation algorithms as an intermediary between near-field measurements and far-field results. These computational mediators process the raw near-field data and transform it into accurate far-field radiation patterns, bridging the gap between the convenient near-field testing environment and the accurate far-field measurement requirements
3Ease of operation
If probe-based measurement fixtures are used, then individual element testing is enabled, but testing complexity and error susceptibility increase
Solution Approach 1:
The patent extracts the measurement probes from complex physical fixtures and integrates them directly into the antenna element structure itself. By incorporating test access points within the antenna elements during manufacturing, the system enables individual element testing without requiring external probe-based fixtures, thereby reducing testing complexity and error susceptibility while maintaining the ability to test individual elements
4Loss of information
If individual radiating elements are tested in isolation, then element-level diagnostics are improved, but impedance measurement accuracy deteriorates
Solution Approach 1:
The patent performs preliminary isolation of individual antenna elements through software control before impedance measurement. By using the isolation matrix to electrically isolate the target element from other active elements in the array, the system creates an accurate single-element impedance measurement environment without requiring physical disconnection or removal of elements, thereby maintaining both diagnostic capability and measurement accuracy
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 efficient, accurate testing and calibration of phased array antennas by isolating individual elements, reducing testing time and costs, and identifying faulty components, while maintaining high polarization diversity and element isolation, thus improving the reliability of phased array antenna systems.
Implementation Method 1
The isolation assembly or test device can include a grid or X-Y isolation structure that is dimensioned to provide isolation of individual antenna elements of the array under test. The test device also includes an array having a plurality of tuned coupling elements
Implementation Method 2
Isolation of the individual antenna elements can be completed or enhanced by a planar z-axis radiation blocker or isolation structure that is located on a side of the array of tuned coupling elements opposite a side facing the antenna elements
Data Source
AI summary
Antenna test systems and methods are disclosed. An antenna test system as disclosed herein can include an X-Y isolation structure that defines a plurality of unit cells, a plurality of coupling elements, with at least one coupling element within each unit cell, and a Z isolation structure. The size and general configuration of the unit cells are selected to allow the individual antenna elements of an array antenna to be placed within a unit cell. Each unit cell thus isolates an antenna element. The disclosed methods include passing energy between antenna elements and corresponding unit cells to characterize the performance of the antenna. An antenna test system as disclosed herein enables the costs associated with testing phased array antenna systems, including but not limited to antennas used in 5G communication systems, to be reduced as compared to prior techniques.