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Dielectric properties of ice at millimeter wavelengths
Author(s) -
Koh Gary
Publication year - 1997
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/97gl02272
Subject(s) - millimeter , microwave , interference (communication) , extremely high frequency , transmittance , materials science , wavelength , dielectric , optics , permittivity , absorption (acoustics) , remote sensing , geology , physics , optoelectronics , telecommunications , channel (broadcasting) , quantum mechanics , computer science
The use of radars to study the geophysical features in a polar environment requires reliable information about the relative complex dielectric permittivity, ε = ε′ + iε″, of ice at microwave and millimeter‐wave frequencies. To address this requirement, ε of ice at millimeter wavelengths was obtained using an interference technique. The interference pattern was produced by measuring the transmittance through bubble‐free ice slabs at normal incident angle as the frequency was swept from 75 to 110 GHz. From the resulting interference patterns, ε′ was determined to be 3.17±0.05 and virtually independent of frequency. Frequency‐dependent absorption loss was observed such that ε″ increased from approximately 2.4 ± 0.2 × 10 −3 to 4.0 ± 0.2 × 10 −3 over the swept frequencies.