Take a sneak peek at the new NIST.gov and let us know what you think!
(Please note: some content may not be complete on the beta site.).
NIST Authors in Bold
|Author(s):||Ben N. Davis; Chriss A. Grosvenor; Robert T. Johnk; David R. Novotny; James R. Baker-Jarvis; Michael D. Janezic;|
|Title:||Complex permittivity measurements of planar building materials using a UWB free-field antenna measurement system|
|Published:||January 01, 2007|
|Abstract:||Building materials are often incorporated into complex, multi-layer macrostructures that are simply not amenable to measurements using coax or waveguide sample holders. In response to this, an ultra-wideband free-field measurement system has been developed. 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 are 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 using optimization software based on genetic algorithms.|
|Citation:||Journal of Research (NIST JRES) -|
|Pages:||pp. 67 - 73|
|Keywords:||digital signal processing,free-field measurement system,genetic algorithm,ground-plane,material properties,optimization,plane-wave model,reflection,TEM half-horn antennas,transmission,ultra-wideband|
|Research Areas:||Electronics & Telecommunications, Electromagnetics|