RF Fixturing Assembly for Flexible Printed Circuit Signal Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for testing high speed RF signals on flexible printed circuits (FPCs) often result in FPC damage, are time-consuming, labor-intensive, and prone to signal integrity degradation, and do not support RF switching beyond 70 GHz without requiring excessive test heads and channels.
Innovation Solution
A mechanical fixturing assembly using a dry compression contact mechanism with computer-controlled alignment and clamping, enabling precise RF and DC connections, thermal control, and high throughput testing without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If soldering is used to connect FPC interfaces, then electrical connections are established, but the process is time consuming and labor intensive, and may lead to FPC wear and damage
Solution Approach 1:
The patent replaces the soldering process (thermal/chemical joining) with a mechanical compression system. A compression mechanism applies controlled force to press the FPC contact surfaces together, establishing electrical connections without heat or adhesives. This substitution eliminates the time-consuming soldering process while maintaining reliable electrical contact, thereby improving both productivity and reliability.
Solution Approach 2:
The patent introduces a compression mechanism as an intermediary device between the FPC and the testing equipment. This intermediary applies controlled compression force to create temporary but reliable electrical connections during testing, eliminating the need for permanent soldering while enabling rapid setup and teardown of test configurations.
2Reliability
If spring loaded pogo pins are used for RF connections, then electrical connections are established, but alignment is difficult and signal integrity degrades
Solution Approach 1:
The patent replaces the spring-loaded pogo pin mechanism with a controlled compression system that uses a compression mechanism and interposer material. This substitution provides more stable and reliable electrical contact, improving signal integrity while simplifying the alignment process through the use of precision-machined components and controlled positioning.
Solution Approach 2:
The patent introduces an interposer material as an intermediary between the FPC contact surfaces and the compression mechanism. This interposer material provides a compliant interface that facilitates precise alignment and maintains stable electrical contact during compression, thereby improving both signal integrity and ease of operation.
3Reliability
If stop blocks are used to corner FPC interfaces, then connections are established, but alignment problems occur due to tolerance stack up errors and FPC wear and damage
Solution Approach 1:
The patent replaces the stop block method with a controlled compression system that uses a compression mechanism to apply uniform force across the FPC contact surfaces. This substitution eliminates the alignment problems caused by tolerance stack-up in stop block configurations, as the compression mechanism actively compensates for dimensional variations and maintains consistent contact pressure throughout the interface area.
Solution Approach 2:
The patent introduces an interposer material as an intermediary that distributes compression force uniformly across the FPC contact surfaces. This interposer material compensates for tolerance variations and prevents localized stress concentrations that cause FPC wear and damage, thereby improving both alignment precision and connection stability.
4Productivity
If conventional testing methods are used, then testing can be performed, but FPC damage occurs and quality control monitoring must be increased
Solution Approach 1:
The patent replaces all conventional mechanical connection methods (soldering, pogo pins, stop blocks) with a controlled compression system that uses a compression mechanism and interposer material. This substitution eliminates the harmful mechanical stresses and thermal effects that cause FPC damage during testing, enabling high-throughput testing without compromising FPC integrity or requiring increased quality control monitoring.
Solution Approach 2:
The patent introduces an interposer material as a protective intermediary between the testing equipment and the FPC. This interposer material cushions and distributes forces during compression, preventing direct mechanical stress on the FPC and eliminating the need for increased quality control monitoring while maintaining full testing capability.
5Speed
If RF switching beyond 70 GHz is implemented, then higher frequency testing is enabled, but an excessive number of test heads and PCB channels are required
Solution Approach 1:
The patent creates a universal testing platform using a single FPC-based fixturing assembly that can accommodate multiple RF channels and test heads. The compression mechanism and interposer material provide a standardized interface that enables flexible configuration of test setups, allowing one testing system to perform multiple functions across different frequency ranges without requiring separate dedicated test heads for each channel.
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
Enables non-destructive, high-throughput testing of FPCs with precise RF signal coupling, allowing RF signal switching beyond 70 GHz and reducing the need for multiple test heads and channels.
Implementation Method 1
a clamping mechanism adapted to be actuated to compress the FPC RF electrical contacts against the PCB RF electrical contacts
Implementation Method 2
an alignment stage adapted to translate the PCB with respect to the FPC to align the RF electrical signal contacts
Data Source
AI summary
A fixturing assembly and method including and utilizing: a component holder adapted to receive and retain a component including a component flexible printed circuit including component radio frequency electrical signal contacts; a test printed circuit board/flexible printed circuit including test radio frequency electrical signal contacts; and a clamping mechanism adapted to be actuated to compress the component radio frequency electrical signal contacts into the test radio frequency electrical signal contacts during radio frequency electrical signal testing of the component. In an embodiment, the clamping mechanism includes a clamping arm that is selectively actuated to be disposed adjacent to an interface between the component radio frequency electrical signal contacts and the test radio frequency electrical signal contacts and to compress the component radio frequency electrical signal contacts into the test radio frequency electrical signal contacts during the radio frequency electrical signal testing of the component.