Title :
Use of horn/lens antennas for free-space microwave permittivity measurements
Author :
Trabelsi, S. ; Kraszewski, A.W. ; Nelson, S.O.
Author_Institution :
Res. Center, US Dept. of Agric., Athens, GA, USA
Abstract :
Measurements of the dielectric properties of wheat at microwave frequencies were performed in free space using a pair of horn/lens antennas. Undesirable effects such as mismatches, multiple reflections and diffraction at the edges of the samples were minimized by selecting optimum conditions and the use of a focused beam. Results are shown at 24/spl deg/C for samples of different moisture content and bulk density.
Keywords :
agriculture; horn antennas; lens antennas; microwave measurement; permittivity measurement; 24 degC; 4 to 13 GHz; bulk density; diffraction; focused beam; free-space microwave permittivity measurements; horn antennas; lens antennas; mismatches; moisture content; multiple reflections; wheat; Antenna measurements; Dielectric measurements; Frequency measurement; Horn antennas; Lenses; Microwave antennas; Microwave frequencies; Microwave measurements; Performance evaluation; Permittivity measurement;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1998. IEEE
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-4478-2
DOI :
10.1109/APS.1998.701601
