Title :
Flanged coaxial microwave probes for measuring thin moisture layers
Author :
Li, Liyou L. ; Ismail, Nour H. ; Taylor, Leonard S. ; Davis, Christopher C.
Author_Institution :
Dept. of Electr. Eng., Maryland Univ., College Park, MD, USA
Abstract :
An analytical, closed-form expression is obtained for the input admittance of a flanged, open-ended coaxial line radiating into a layered lossy material. The effect of higher modes as well as the dominant mode have been taken into consideration. The results obtained in the experimental measurement of the microwave reflection coefficient of the probe radiating into very thin water layers are described and compared with the results obtained from numerical calculations based on a theoretical model. The measurements were made in the 5.0-7.0 GHz range. The results demonstrate, for example, the usefulness of this type of device in measuring thin moisture layers in the outer layer of human skin.
Keywords :
biomedical measurement; microwave measurement; moisture measurement; probes; skin; 5 to 7 GHz; analytical closed form expression; dominant mode; flanged coaxial microwave probes; flanged open-ended coaxial line; higher modes; human skin outer layer; input admittance; layered lossy material; microwave reflection coefficient; numerical calculations; theoretical model; thin moisture layers measurement; Admittance; Closed-form solution; Coaxial components; Humans; Microwave devices; Microwave measurements; Moisture measurement; Probes; Reflection; Skin; Body Water; Diagnosis, Computer-Assisted; Evaluation Studies as Topic; Humans; Microwaves; Models, Theoretical; Skin;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
