Complex Permittivity of Planar Building Materials Measured With an Ultra-Wideband Free-Field Antenna Measurement System |
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Authors: | Ben Davis Chriss Grosvenor Robert Johnk David Novotny James Baker-Jarvis Michael Janezic |
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Affiliation: | National Institute of Standards and Technology, Boulder, CO 80305-3328 |
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Abstract: | Building materials are often incorporated into complex, multilayer macrostructures that are simply not amenable to measurements using coax or waveguide sample holders. In response to this, we developed an ultra-wideband (UWB) free-field measurement system. This measurement system uses a ground-plane-based system and two TEM half-horn antennas to transmit and receive the RF signal. The material samples are placed between the antennas, and reflection and transmission measurements made. Digital signal processing techniques are then applied to minimize environmental and systematic effects. The processed data are compared to a plane-wave model to extract the material properties with optimization software based on genetic algorithms. |
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Keywords: | digital signal processing free-field measurement system genetic algorithm material properties TEM half-horn antennas transmission ultra-wide-band |
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