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Numerical Analysis of a Coaxial Line With a Complex Gap Capacitance



Jan Obrzut, O Anopchenko


A full wave numerical analysis was performed for a coaxial line terminated by a complex gap capacitance. The scattering parameters, input impedance and the spatial distribution of the electromagnetic field have been obtained in the frequency range of 100 MHz to 20 GHz for specimens 8 mm to 320 mm thick, with a the dielectric constant of up to 70. It was found that the residual inductance of the specimen affects the impedance characteristic of the network that results in the LC resonance coupled with the cavity resonance. The specimen inductance is linearly dependent on the specimen thickness. At frequencies near the cavity resonance, the specimen section can be treated as a network of a transmission line with capacitance, where the fundamental mode propagates along the diameter of the specimen. The results are useful in improving accuracy of broadband dielectric measurements in extended frequency range of thin films with high dielectric constant that are of interest to bio-and nano-technology.
Proceedings Title
Instrumentation and Measurement Technology; IMTC/03, Proceedings | 20th |
Conference Dates
May 1, 2003
Conference Title
IEEE Instrumentation and Measurement Technology Conference


coaxial discontinuity, dielectric materials, full wave analysis, high frequency electromagnetic simula, high frequency measurements


Obrzut, J. and Anopchenko, O. (2003), Numerical Analysis of a Coaxial Line With a Complex Gap Capacitance, Instrumentation and Measurement Technology; IMTC/03, Proceedings | 20th |, [online], (Accessed April 16, 2024)
Created May 1, 2003, Updated February 19, 2017