Measurement of the dielectric constant in a microwave near field
نویسندگان
چکیده
منابع مشابه
Measurement of Dielectric Constant and Loss Factor of the Dielectric Material at Microwave Frequencies
A new technique to evaluate the dielectric constant and loss factor of a homogeneous dielectric material using rectangular shaped perturb cavity has been developed. The values of S-parameters are measured experimentally by placing the sample in the center of the cavity resonator. Sample under test is fabricated in the form of a cylinder. The real and imaginary part of the permittivity can be th...
متن کاملNear field imaging with negative dielectric constant lenses
A recent analysis by Pendry #J. B. Pendry, Phys. Rev. Lett. 85, 3966 !2000"$ shows that a dielectric slab with a dielectric constant %!"1 can produce a perfect image in the electrostatic limit (c →&), independent of the permeability ', and therefore is a perfect lens. Here we include retardation effects and show how distance and dissipation make the lens no longer perfect. Nevertheless we concl...
متن کاملMicrocontroller Based Dielectric Constant Measurement
A dielectric constant measurement setup has been developed to measure dielectric constant of liquids using AT89C55WD microcontroller. A modified operational amplifier based AC Schering Bridge network is used to compute capacitance and hence calculate dielectric constant of liquids. This instrument system permits recording of dielectric constant of liquids at various concentrations and temperatu...
متن کاملSwitching Dielectric Constant Near Room Temperature in a Molecular Crystal
The organic salt bis(2-chloroethyl)amine hydrochloride shows a sharp switching of its dielectric constant at 320 K. The switching property originates from the dynamic changes of the (2-chloroethyl)ammonium cation between frozen and motional states, corresponding to a structural phase transition.
متن کاملAutomatic Measurement of Complex Dielectric Constant and Permeability at Microwave Frequencies
With the advent of the computer and automatic test equipment, new techniques for measuring complex dielectric constant (a) and permeability Q can be considered. Such a technique is described where a system is employed that automatically measures the complex reflection and transmission coe5cients that result when a sample of material is inserted in waveguide or a TEM transmission line. Measureme...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Journal of Engineering
سال: 2019
ISSN: 2051-3305,2051-3305
DOI: 10.1049/joe.2018.9153