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Complex Permittivities of Candidate Radome Materials at W-bandThis report presents the results of w-band complex permittivity measurements performed in NASA Langley's Electromagnetics Research Branch. The test articles included in the permittivity study were flat panels of materials which are under consideration for use in a radome for the Passive Millimeter Wave Camera (PMMWC) flight experiment. This experiment is scheduled to fly on the Air Force's 'Speckled Trout' aircraft in late 1997. The radome design is very important because the PMMWC can tolerate only a small amount of electromagnetic loss through the radome. A free space measurement system was used to obtain complex reflection and transmission coefficients of the samples. The frequency of interest was 89 GHz, so measurements were performed over a range of 79 to 99 GHz. The transmission and reflection coefficients were used, along with the measured sample thickness, to calculate complex permittivity over the frequency range. The material samples measured in this study can be divided into four categories: skin materials, core materials, coating materials, and layered samples.
Document ID
19970027550
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Cravey, Robin (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1997
Subject Category
Air Transportation And Safety
Report/Patent Number
NAS 1.15:110344
NASA-TM-110344
Report Number: NAS 1.15:110344
Report Number: NASA-TM-110344
Accession Number
97N26480
Funding Number(s)
PROJECT: RTOP 522-24-21-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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