In CST , i am placing a dielectric material between two antennas and measuring their s11 and s21. I tried Nicolson-Ross-Weir Method but it is not giving me correct dielectric constant value. Basically i am just trying to calculate FR-4 and Rogers substrates dielectric using antennas.I am calculating for the freq span of 2-6 GHz Antenna Setup is in following picture
Dear Humza Sami,
there are certainly several methods to calculate dielectric properties depending on the frequencies of interest and the material to be measured. I have worked with NRW with waveguides, if you want to work with free space this article could help you:
Article A free space measurement for dielectric constant and loss ta...
I measured my material by placing it under measurement in a section of the waveguide and measuring the two-port complex scattering parameters with the NA. The set up including the sample holders is shown in the attached Figure. Then the electromagnetic constitutive parameters for the material (ε’, ε”, µ’, µ”) were calculated from the measured s-parameters (S11 and S21) using the Nicolson-Ross-Weir technique.
Dear Ahmed Sayed,
COULD YOU PLEASE SHARE THE MAIN CONSIDERATIONS WHEM APPLYING NRW, I MEAN WHILE MEASURING S PARAMETERS, ERRORS DUE TO AIR GAPS AND THE APPLICATION OF THE ALGORITHM? DO YOU HAVE A MATLAB SCRIPT TO SHARE? THANK YOU!!!
Hello,
To measure parameters like permittivity and permeability, it is the transmission lines that is used in transmission and/or in reflection mode. for better understanding of this type of measurement, you can read this application note.
Thanks,
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