Abstract
Electromagnetic interferances cause frequent troubles due to the fact that microelectronic circuits are operated at increasingly low level in those days. The design of electric devices must be made taking the electromagnetic compatibility into account. Simulation technique capable of solving the onhomogeneous field with unbounded electromagnetic radiation can be a great help for this. Helmholtz's equation for the axi-symmetric electromagnetic radiation problem is formulated by the finite element method incorporating with the hybrid-type infinite elements. Solution of a loop antenna is first given and consequently the numerical result shows a good agreement with the analytical one. Calculation is then extended to the shielding effects of conductive rings including their skin effect. It is shown that the shielding could be established if the equivalent conductivity of the conductors were higher than a certain level.
