Scattering from a Circular Aperture Excited by an Off-Axis Loop: A Fast Convergent Technique

This work presents an exact, rapidly convergent formulation for evaluating electromagnetic field transmission through a circular aperture in a perfectly conducting plate. The source and receiver can be positioned arbitrarily in the two half-spaces. Using the equivalence principle, the problem is formulated in the Hankel transform domain, leading to dual integral equations. These are regularized into a second-kind Fredholm integral equation through analytical regularization. Computational efficiency is further enhanced by techniques that accelerate integral evaluations.