Magnetic field penetration through a circular aperture in a perfectly conducting plate excited by a coaxial loop

The transmission of an electromagnetic field produced by a current loop finite radius through coaxial circular aperture in perfectly conducting plate is evaluated rapidly convergent formulation exact form. By applying the equivalence principle, problem first formulated Hankel transform domain, obtaining set dual integral equations which equivalent surface magnetic density defined on not known. regularised second-kind Fredholm equation Abel integral-transform technique. solution achieved expanding unknown orthogonal basis functions that correctly reproduce behaviour at edge aperture. Finally, under particular assumptions, low-frequency extracted closed Numerical results are reported to validate accuracy and efficiency proposed formulations.