High Frequency Measurements Phase 2
Phase II of this project proposes to evaluate the effect of moisture on each of the high frequency Dk and Df test methods, except Equivalent Band Width (EBW). The lower loss laminate material selected for a pilot run will be known to absorb significant amounts of moisture, but without having any fillers capable of releasing water or moisture into the material during thermal excursions or at higher temperatures.
HDP’s High Frequency Measurements Phase 1 project completed in 2015. That project was the industry’s first characterization of all of the different high frequency test methods available for measuring Dk and Df. The final report of that project was selected as the best paper of IPC Apex-Expo 2015.
During the testing and analysis of the Phase 1 project, it was determined that there were strong Dk and Df data correlations between high frequency test methods that were of the same type. However, differences in moisture content were found to contribute up to a 20 percent difference in the measured Df values of some laminate materials tested.
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Members - Go to the "Subscribe Here" section to the right and select the "Subscribe to space" key.
Non Members - Go to the "Contact" section to the right and select the "Contact project facilitator" key.
The moisture content of laminates can affect the Dk and Df measurements of the laminate. This is especially prevalent at higher frequencies. This project proposes to evaluate the effect of moisture on each of several laminate material high frequency Dk and Df test methods. The low loss laminate materials selected for this testing will be known to be able to absorb significant amounts of moisture, but will not contain fillers capable of releasing water or moisture into the resin system during thermal excursions or at higher temperatures.
The effect of moisture on the different techniques of measuring Dk and Df is unknown. Also the impact of moisture on weight measurement is unknown.
A goal of Phase II of this project is to determine a repeatable correlation between a Z-axis Dk and Df test method to the percent moisture content in the material.
A goal is to publish a report to the members that describes the project findings and adds to the industry data base.