Complex Permittivity of Planar Building Materials Measured With an Ultra-Wideband Free-Field Antenna Measurement System.
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.
National Institute of Standards and Technology, Boulder, CO 80305-3328.
Ben
B
Davis
National Institute of Standards and Technology, Boulder, CO 80305-3328.
Chriss
C
Grosvenor
National Institute of Standards and Technology, Boulder, CO 80305-3328.
Robert
R
Johnk
National Institute of Standards and Technology, Boulder, CO 80305-3328.
David
D
Novotny
National Institute of Standards and Technology, Boulder, CO 80305-3328.
James
J
Baker-Jarvis
National Institute of Standards and Technology, Boulder, CO 80305-3328.
Michael
M
Janezic
TEM half-horn antennas; digital signal processing; free-field measurement system; genetic algorithm; material properties; transmission; ultra-wide-band