Title :
A probe antenna for in situ measurement of the complex dielectric constant of materials
Author :
Nassar, Elias M. ; Lee, Robert ; Young, Jonathan D.
Author_Institution :
Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA
fDate :
6/1/1999 12:00:00 AM
Abstract :
A new probe for the in situ measurement of the complex dielectric constant of materials in the microwave frequency region is described. The probe uses two stub antennas mounted on a cylinder. The cylinder is inserted in the material and the transmission coefficient between the two antennas is measured. By comparing this signal with that predicted from a numerical model of the probe obtained by the finite-difference time-domain (FDTD) method we can determine the dielectric constant of the material. The measurement setup and numerical model of the probe are described and several measurement examples in natural and artificial media are presented
Keywords :
electromagnetic wave transmission; finite difference time-domain analysis; microwave antennas; microwave measurement; permittivity measurement; 2 to 10 GHz; FDTD method; artificial media; complex dielectric constant; finite-difference time-domain; in situ measurement; measurement setup; microwave frequency; natural media; numerical model; probe antenna; stub antennas; transmission coefficient; Antenna measurements; Dielectric constant; Dielectric materials; Dielectric measurements; Finite difference methods; Frequency measurement; Microwave measurements; Numerical models; Probes; Time domain analysis;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
