| Issue |
EPJ Web Conf.
Volume 353, 2026
mm Universe 2025 - Observing the Universe at mm Wavelengths
|
|
|---|---|---|
| Article Number | 01004 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1051/epjconf/202635301004 | |
| Published online | 20 February 2026 | |
https://doi.org/10.1051/epjconf/202635301004
Complex Permittivity Measurements with Quasioptical Fabry-Pérot Resonators
1 Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA 02138, USA
2 Department of Physics, Harvard University, Cambridge, MA 02138, USA
* email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published online: 20 February 2026
Abstract
As millimeter instrumentalists push the precision and mapping speed of their instruments ever-higher to make ever-deeper measurements, the need for a precise understanding of the complex permittivity of the dielectrics used in these instruments at their operating temperature heightens. To address this need, we have developed high quality factor quasioptical Fabry-Pérot open resonators spanning 75 GHz-330 GHz, optimized for rapid use in a quick-turnaround 4K cryostat. These hemispherical resonators enable precise metrology of low-loss bulk and thin dielectrics. We present the design and characterization of, and some complex permittivity measurements from, a W-band open resonator.
© The Authors, published by EDP Sciences, 2026
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