Millimeter-Wave Transmittance and Reflectance Measurement on Pure and Diluted Carbonyl Iron

• Published in: IEEE transactions on instrumentation and measurement Vol. 59; no. 8; pp. 2198 - 2203
• Main Authors: Korolev, K A, Shu Chen, Zijing Li, Afsar, M N
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2010; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Carbonyl powders; Carbonyls; Complex permittivity; Dielectric materials; Dielectric measurements; Dilution; ferromagnetic composites; Frequency dependence; Frequency measurement; Iron; Millimeter wave measurements; Organic materials; Performance evaluation; Permittivity measurement; Reflectance; Reflectivity; Spectrometers; Transmittance
• ISSN: 0018-9456; 1557-9662
• DOI: 10.1109/TIM.2009.2031851

Transmittance and reflectance measurements on highly absorbing carbonyl iron materials over a broad millimeter-wave frequency range have been performed. The frequency dependence of the complex dielectric permittivity of a carbonyl iron diluted composite and pure powdered materials has been determined in the millimeter waves for the first time. The measurements have been employed using a free-space quasi-optical millimeter-wave spectrometer equipped with a set of high-power backward-wave oscillators as sources of coherent radiation, which are tunable in the range from 30 to 120 GHz. A significant transmission zone of millimeter-wave radiation at a frequency around 60 GHz has been observed in the transmittance spectra for the carbonyl iron materials.