Trend Topics 2020
Small, smaller, microtechnology
Safe and sustainable
Medical technology – printed, molded, lasered
Personalized and precise
Specials 2020
Sustainable medical technology
Sensors in medical technology
Preview of the virtual.COMPAMED 2020
Older Specials
Sensor Technology: "We always try to create tailor-made solutions for our customer's product"
Antiferromagnets: "Our discovery is real and proven"
The virtual.COMPAMED: "Definitely a different experience"
Video Background Reports
virtual.COMPAMED 2020 - Connectors in the OR
virtual.COMPAMED 2020 - Experience hightech online with IVAM
Radiation sterilization: Germ-free medical devices fast and safe
Covid-19 and much more - How a sensor is developed for different applications
COMPAMED 2020 – High-Tech Solutions for Medical Technology
Older Background Reports
Background Reports 2019
virtual.COMPAMED 2020
12/15/2020: A special year with a special COMPAMED 2020
09/16/2020: Implants: It depends on the right material!
08/17/2020: Implants and their components
07/15/2020: Covid-19 and the mask
06/15/2020: Sensors in medical technology
04/15/2020: Make contacts at the COMPAMED
03/16/2020: Sensor for liquids
02/17/2020: Sustainable medical technology
Newsletter archive 2020
COMPAMED Magazine /
Archive /
Temperature and Electrical Properties
Researchers at the National Institute of Standards and Technology (NIST) and DuPont Electronic Technologies (Research Triangle Park, N.C.) have demonstrated a non-destructive method for measuring how temperature affects the electrical properties of three common circuit board materials that are ceramic, polymer and glass. The work, described at a recent conference, provides manufacturers with an accurate technique for measuring high-frequency electrical properties of substrates without cutting up the material - enabling faster, less expensive and easier testing - as well as a tool for designing circuits and substrates with improved performance.
NIST has been working with ceramic and printed-wiring board manufacturers for five years to develop the technique. They previously have used the method to measure changes in electrical properties as substrates are subjected to different electromagnetic frequencies. The work is important to the electronics industry because the performance of electrical circuits depends in part on the electrical properties of the substrate.
The apparatus used in the experiments, the split-cylinder resonator, was originally designed elsewhere, but NIST developed a mathematical model that improves its accuracy and extends its frequency range. The model has been approved as an industry standard.
A thin piece of substrate is placed between two halves of a cylindrical cavity - smaller than a coffee mug - inside an environmental chamber. A computer analyzes the changes in the microwave-range resonant frequency as the chamber temperature changes from -50 to 100 degrees Celsius. As the temperature rose, an important electrical property called loss tangent (a measure of electrical losses in an insulating material) fell in glass, generally increased in the organic substrate, and remained stable in one type of ceramic while rising slightly in another.
COMPAMED.de; Source: National Institute of Standards and Technology (NIST)
Subscribe to COMPAMED newsletter
ZDRAVOOKHRANENIYE – Moskow / Russia