Elliptic Aperture Coaxial Sensor
Keywords:Elliptic aperture coaxial sensor, A two-layer dielectric medium, Reflection coefficient
Flat open-ended coaxial sensors are increasingly popular for numerous measurement techniques, as a non-destructive method, due to the increased sensitivity and contrast obtained at microwave frequencies. The flat aperture of the sensor limits the practical application of such a method, particularly in diagnosis. In this paper, an elliptic aperture coaxial sensor with small dimensions is introduced and numerically analysed.
Using finite element method, the radiation from the elliptical aperture into a two-layer dielectric medium is examined. Explicit contrast of reflection coefficient in both magnitude and phase, and high sensing depth are obtained with such a sensor aperture at low microwave frequencies of 0.1, 0.3, 1, and 3 GHz.
Meaney, P.M., Gregory, A.P., Epstein, N.R. et al. Microwave open-ended coaxial dielectric
probe: interpretation of the sensing volume re-visited. BMC Med Phys 14, 3 (2014).
Xu, G., Liu, H., Huang, Q. et al. Sensitivity investigation of open-ended coaxial probe in skin
cancer detection. Phys Eng Sci Med (2023).
Xu, Y., F. M. Ghannouchi and R. G. Bosisio (1992). "Theoretical and experimental study of
measurement of microwave permittivity using open ended elliptical coaxial probes." IEEE
Transactions on Microwave Theory and Techniques 40(1): 143-150.
Xu, Y., R. Bosisio, A. Bonincontro, F. Pedone and G. F. Mariutti (1993). "On the measurement
of microwave permittivity of biological samples using needle-type coaxial probes." IEEE
Transactions on Instrumentation and Measurement 42(4): 822-827.
Athey, T. W., M. A. Stuchly and S. S. Stuchly (1982). "Measurement of Radio Frequency
Permittivity of Biological Tissues with an Open-Ended Coaxial Line: Part I." IEEE
Transactions on Microwave Theory and Techniques 30(1): 82-86.
Engelder, D. S. and C. R. Buffler (1991). "Measuring dielectric properties of food products at
microwave frequencies." Microwave world 12(2): 6-15.
Langhe, P. D., K. Blomme, L. Martens and D. D. Zutter (1993). "Measurement of lowpermittivity materials based on a spectral-domain analysis for the open-ended coaxial
probe." IEEE Transactions on Instrumentation and Measurement 42(5): 879-886.
Gabriel, C. (1991). Permittivity Probe Modelling. King's College London.
Mosig, J. R., J. E. Besson, M. Gex-Fabry and F. E. Gardiol (1981). "Reflection of an open-ended
coaxial line and application to nondestructive measurement of materials." IEEE Transactions
on Instrumentation and Measurement IM-30(1): 46-51.
King, M. and J. Wiltse (1961). "Coaxial transmission lines of elliptical cross section." IRE
Transactions on Antennas and Propagation 9(1): 116-118.
Keysight. (2010, Jul 13, 2010). " The Finite Element Method." Retrieved September 22, 2022,
Buckley, F. and A. A. Maryott (1958). Tables of Dielectric Dispersion Data for Pure Liquids
and Dilute Solutions, U.S. Department of Comerce, National Bureau of Standards.