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2019-01-09
An Exact Expression for the Mutual Impedance Between Coaxial Circular Loops on a Homogeneous Ground
By
Marco Muzi

    Dr. Marco Muzi

    Unit of Electrical Engineering

    University Campus Bio-Medico of Rome

    Italy

    Homepage

Progress In Electromagnetics Research Letters, Vol. 81, 65-70, 2019
doi:10.2528/PIERL18110902 | Google Scholar

Abstract
This paper presents an exact expression for the mutual impedance of two coaxial loops located on the surface of a conductive ground. The semi-infinite complete integral representation for the impedance is first converted into a finite integral. Then the spherical Hankel function contained in the integrand is expanded according to Gegenbauer addition theorem. This makes it possible to perform analytical integration and express the mutual impedance as a sum of products of spherical Bessel functions. Since no simplifying assumption is introduced in the mathematical derivation, the obtained formula is valid in quasi-static as well as non-quasi-static frequency ranges. Numerical examples show how, accuracy being equal, the proposed expression is less computationally expensive than standard Gauss-Kronrod numerical integration technique.
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Citation
Marco Muzi, "An Exact Expression for the Mutual Impedance Between Coaxial Circular Loops on a Homogeneous Ground," Progress In Electromagnetics Research Letters, Vol. 81, 65-70, 2019.
doi:10.2528/PIERL18110902
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