Scaled Antenna Reflector for Compact Testing
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Solution Overview
Problem
The high cost and impracticality of accurately testing antenna performance characteristics, such as cross-polarization and gain, in large anechoic chambers make it challenging to ensure the quality of offset feed dish antennas during production.
Innovation Solution
A method and apparatus using a scaled test antenna reflector, which is smaller than the operational reflector, to measure antenna characteristics like cross-polarization and gain, allowing for testing in a compact antenna test range (CATR) and correlating results with full-sized reflector measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large anechoic chamber is used for accurate antenna testing, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent uses a scaled model reflector (copy) that replicates the geometric properties of the full-sized operational reflector. By scaling down the reflector dimensions while maintaining the same focal ratio and geometric relationships, the invention creates a test setup that accurately measures antenna feed characteristics without requiring a full-sized anechoic chamber. The scaled model preserves the essential electromagnetic field patterns needed for accurate measurement.
Solution Approach 2:
The invention changes the physical scale parameter of the reflector system. By using a reflector with scaled dimensions (maintaining the same focal ratio f/D), the patent transforms the testing requirements from needing a large chamber to using a compact test range. This parameter change allows accurate feed pattern measurement in a much smaller physical space while maintaining measurement validity through geometric similarity.
2Measurement precision
If a full-sized reflector is used for testing, then measurement accuracy is improved, but loss of time and productivity decrease due to setup complexity
Solution Approach 1:
The scaled model reflector serves as a simplified copy that captures the essential geometric and electromagnetic characteristics of the full-sized reflector. This copying approach enables rapid setup and testing during production assembly, as the smaller model requires less space, fewer resources, and simpler positioning while still providing accurate feed performance data needed for quality control.
Solution Approach 2:
The patent enables testing to be performed at intermediate stages during assembly using the compact scaled setup. Rather than waiting for complete assembly or requiring complex full-sized chamber setup, the scaled reflector allows preliminary feed performance verification to be conducted quickly during the assembly process, improving production throughput and early defect detection.
3Reliability
If accurate antenna testing is performed, then reliability is improved, but loss of substance and cost increase due to facility requirements
Solution Approach 1:
By using a scaled model reflector that preserves the essential geometric properties (focal ratio, shape factors) of the operational reflector, the invention provides reliable antenna feed performance verification without requiring expensive full-sized anechoic chambers. The scaled copy maintains the necessary electromagnetic field relationships for accurate measurement while consuming far fewer physical resources.
Solution Approach 2:
The scaled model reflector represents a simplified, lower-cost testing apparatus compared to full-sized permanent anechoic chamber facilities. The compact setup can be more easily deployed, modified, or replaced as needed for production testing, reducing the resource investment and commitment required for maintaining high-reliability testing capabilities.
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 enables cost-effective and efficient production testing of antenna systems by accurately measuring performance characteristics using a miniaturized reflector, reducing the size and cost of testing facilities while maintaining high measurement accuracy.
Implementation Method 1
providing electromagnetic energy to the antenna feed via the test antenna system reflector
Data Source
AI summary
A system and method for testing an antenna feed to be incorporated into an operational antenna is disclosed. The system and method uses a scaled reflector with the antenna feed to permit testing that correlates well with a full sized reflector, yet permits testing in a quiet zone of a compact antenna test range. Embodiments are also disclosed for offset feed designs.