Measurement Results
Key Point!
- Materials classified as polyimides can exhibit very different frequency-dependent properties.
- Direct measurement is essential for understanding frequency dependence.
- Continuous data up to 330 GHz with no discontinuities when switching resonator modules.
Even materials classified as polyimides can have substantially different frequency-dependent dielectric properties because of differences in composition. Each material therefore needs to be evaluated at its actual operating frequency. The results below are part of collaborative research with the Shinji Ando Laboratory, School of Materials and Chemical Technology, Institute of Science Tokyo.
For example, Sample G had the lowest loss at 28 GHz but showed higher loss than Samples A, B, and F at 300 GHz. Dielectric properties can depend strongly on frequency, and the degree of dependence differs among samples. Both material manufacturers and equipment manufacturers need data at the frequencies where their products will be used.
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System Configuration
- Fabry-Perot resonators, broadband, D-band, and J-band, FP-BB/D/J (EM labs)
- Permittivity measurement software for Fabry-Perot resonators, FP-MA (EM labs)
- Vector network analyzer: N5290A (Keysight Technologies)
- Mini VNAX frequency extender module: N5262BW03 (Keysight Technologies)
- Mini VNAX frequency extender module: N5262BW06 (Keysight Technologies)
Measured Samples
- Seven polyimide films
Additional Information
This work was conducted in collaboration with the Shinji Ando Laboratory, School of Materials and Chemical Technology, Institute of Science Tokyo.
Reference: H. Liu, R. Sawada, S. Yanagimoto, Y. Yanagimoto, and S. Ando, “Frequency-dependent dielectric properties of aromatic polyimides in the 25-330 GHz range,” Applied Physics Letters, 124 (2024). DOI: 10.1063/5.0205692.