Measurement examples

Overview

The dielectric constant frequency characteristics of materials classified as “polyimide” vary greatly depending on the composition, so it is necessary to evaluate each material at the actual frequency at which it will be used. As a good example, we will introduce some of the results of the research with the Ando Laboratory at the Tokyo Institute of Technology. For example, although Sample G had the lowest loss at 28 GHz, it deteriorated at 300 GHz compared to Samples A, B and F. The dielectric properties of the samples depend greatly on the frequency, and the degree of dependence differs depending on the sample. It is clear that both material and equipment manufacturers need to obtain the dielectric constant at the frequency they are using, in order to avoid the risk of going down the wrong path.

System Configuration

• Fabry-Perot resonator FP-BB/D/J
• Fabry-Perot Resonator Software N1501AFPSW
• Network analyzer: N5290A (Keysight Technologies)
• Mini VNAX frequency extension module: N5262BW03 (Keysight Technologies)
• Mini VNAX frequency extension module: N5262BW06 (Keysight Technologies)

Samples

7 kinds of polyimide

Ref. H. Liu, R. Sawada, S. Yanagimoto, Y. Yanagimoto, and S. Ando, “Frequency-dependent dielectric properties of aromatic polyimides in the 25–330 GHz range”, Appl. Phys. Lett., 2024, 124; doi: 10.1063/5.0205692.

For a copy of the paper, please see here.

Results

Note

In collaboration with the Ando Laboratory, Tokyo Institute of Technology.