Title :
Characterization of dielectric properties of grain at microwave frequency
Author :
Kim, Jong-Heon ; Kim, Ki-Bok ; Noh, Sang-Ha
Author_Institution :
Kwangwoon Univ., Seoul, South Korea
Abstract :
A free space transmission method using an X-band standard gain horn antenna is applied to measure the attenuation and phase shift through the wet grain using a vector network analyzer. The moisture content of grain varies from 11% to 25% based on its wet condition. The relative complex permittivities of grain are calculated from the measured attenuation and phase shift in the X-band frequency range. A new method is proposed for reducing the effects of density variation on the measured results
Keywords :
attenuation measurement; density; dielectric loss measurement; dielectric measurement; food processing industry; horn antennas; microwave measurement; moisture; nondestructive testing; permittivity measurement; phase measurement; 9.0 to 10.5 GHz; X-band standard gain horn antenna; attenuation; density variation; dielectric properties; free space transmission method; grain; microwave frequency; moisture content; phase shift; relative complex permittivities; vector network analyzer; wet condition; wet grain; Antenna measurements; Attenuation measurement; Dielectric measurements; Extraterrestrial measurements; Gain measurement; Horn antennas; Measurement standards; Permittivity measurement; Phase measurement; Transmitting antennas;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1997., Proceedings of the 5th International Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-2651-2
DOI :
10.1109/ICPADM.1997.617535
