Title :
Analysis of different coaxial discontinuities for microwave permittivity measurements
Author :
Xu, Yansheng ; Bosisio, Renato G.
Author_Institution :
Dept. de Genie Electr. et de Genie Inf., Ecole Polytech. de Montreal, Que., Canada
fDate :
4/1/1993 12:00:00 AM
Abstract :
A comparative analysis of a coaxial line terminated by a circular waveguide filled with different types of dielectrics is used for microwave permittivity measurements. The numerical results provide clear insight into the different methods of measurement, and on this basis the proper choice of the coaxial discontinuities can be made including the dimensions of the test sample to achieve wide bandwidth and enhancement of measurement accuracy at low frequencies. A new expression for calculating the permittivity of a small quantity of a material available only in limited quantities, as is the case in certain biological materials (such as DNA), is derived
Keywords :
biological techniques and instruments; circular waveguides; coaxial cables; dielectric-loaded waveguides; microwave measurement; numerical analysis; permittivity measurement; DNA; biological materials; circular waveguide; coaxial line; comparative analysis; different coaxial discontinuities; dimensions; measurement accuracy; microwave permittivity measurements; Bandwidth; Biological materials; Coaxial components; Dielectric constant; Dielectric materials; Dielectric measurements; Frequency measurement; Materials testing; Microwave measurements; Permittivity measurement;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
