Cublier Martínez, AymarAuñón Marugán, AliciaRamos Somolinos, DavidSanz, RuyPlaza Gallardo, BorjaPoyatos Martinez, David2026-03-242026-03-242025-09XL EDICIÓN SIMPOSIO NACIONAL URSI 2025, TARRAGONA - ESPAÑAhttps://ursi.es/2024/09/16/simposio-nacional-ursi-2025-tarragona/https://hdl.handle.net/20.500.12666/1819[en] Many cryogenic missions for space observation have been launched in the past. In all of them, it was key to insulate the observation devices from thermal and electromagnetic perturbations. A solid understanding of materials and signal propagation is therefore essential to achieve full spectral isolation for cryogenic systems. This work introduces a non-resonant electromagnetic characterization method to extract permittivity and loss in dielectric materials at extreme temperatures. The authors design, simulate and validate a double microstrip transmission line and implement a flexible extraction method to measure permittivity over a wide frequency range, using materials such as CuClad 250, ROGERS 4350B and FR-4. Albeit refinements to the extraction process and comparison with real measurements in a cryogenic setting are possible, the resulting system is shown to be consistent and reliable across all simulations.spaAttribution 4.0 Internationalhttps://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/openAccess