Adjustable RF Probe Array for Precision Wireless Device Testing
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Solution Overview
Problem
It is challenging to make satisfactory measurements on electronic device structures, particularly in manufacturing environments that require low cost, low complexity, and high manufacturing volumes, due to variations in performance characteristics such as output power, gain, frequency response, efficiency, and linearity of wireless electronic devices.
Innovation Solution
A radio-frequency test system with adjustable test fixtures that allow for precise positioning of probes along orthogonal axes to test antenna structures and conductive housing structures, enabling the application and measurement of radio-frequency signals to detect faults and ensure proper grounding, using equipment like vector network analyzers and spectrum analyzers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed probe arrays are used for testing, then manufacturing complexity is reduced, but measurement precision deteriorates due to inability to accommodate variations in device structures
Solution Approach 1:
The patent implements adjustable probe arrays that can dynamically reposition themselves in three-dimensional space to adapt to variations in device structures under test. The probes are mounted on movable stages with adjustment mechanisms that allow precise positioning along multiple axes, enabling the test fixture to accommodate different device geometries while maintaining optimal measurement conditions.
Solution Approach 2:
The test fixture allows modification of probe positions and orientations as adjustable parameters to match the specific characteristics of each device being tested. By changing the spatial parameters of the probe array configuration, the system can optimize measurements for different device structures without requiring complete fixture redesign.
2Measurement precision
If highly accurate test fixtures are designed to accommodate device variations, then measurement precision is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The test fixture is divided into modular segments including separate probe assemblies, adjustable stages, and independent positioning mechanisms. Each module can be manufactured and calibrated separately, then assembled into the complete test fixture. This segmentation reduces manufacturing difficulty while maintaining the ability to achieve precise measurements through coordinated operation of the modular components.
Solution Approach 2:
The adjustable probe array design creates a universal test fixture that can accommodate multiple device types and configurations using the same hardware platform. Rather than building specialized fixtures for each device variation, the universal fixture uses programmable positioning and adjustment mechanisms to adapt to different test requirements, reducing overall manufacturing complexity and cost.
3Adaptability or versatility
If manual probe positioning is used, then adaptability to different device structures is improved, but testing speed and productivity decrease
Solution Approach 1:
The test fixture incorporates automated positioning systems with feedback mechanisms that enable self-adjustment to device structures. The system includes sensors that detect device geometry and automatically calculate optimal probe positions, then actuate the positioning mechanisms without operator intervention. This self-service capability maintains high adaptability while eliminating the time loss associated with manual repositioning between devices.
Solution Approach 2:
The system uses feedback from sensing elements that detect the actual positions and orientations of device structures under test. This feedback information is processed by control systems that automatically adjust probe array configuration to optimize measurements. The closed-loop feedback mechanism enables rapid adaptation to different devices while maintaining measurement precision, significantly improving productivity compared to open-loop manual positioning.
Data Source
AI summary
Electronic device structures may be tested using a radio-frequency test system. The radio-frequency test system may include radio-frequency test equipment and an associated test fixture. The radio-frequency test equipment may be used in generating and measuring radio-frequency signals. The test fixture may contain adjustable structures that allow the positions of radio-frequency test probes to be adjusted. The test system may be configured to position radio-frequency probes in the test fixture so that some probe contacts form electrical connections with conductive antenna structures. The radio-frequency probes may contain other contacts that are positioned to form electrical connections with conductive electronic device housing structures. During radio-frequency testing, the test equipment in the test system may apply radio-frequency test signals to the device structures under test using the test probes. Corresponding radio-frequency test signals may be measured by the test equipment.