ABSTRACTElectromagnetic shielding is one of the most promising applications ofsuperconductors that still needs further investigation. An enhanced model is thereforeproposed to design optimum shielding structures made from different low and high criticaltemperature(LTS & HTS) superconductors. The proposed model incorporates classicalelectrodynamics with both superconductivity macroscopic theories such as two-fluid model,Ginzburg-Landau (GL) theory, and microscopic Bardeen-Cooper-Schrieffer (BCS) theory.Thermodynamic properties are also included using improved Gorter-Casimir relations basedon published experimental data. General shielding effectiveness expressions are derived fordifferent superconducting shielding structures against generally polarized incidentelectromagnetic waves. A computer algorithm is then developed to investigate the impact ofsuperconducting material parameters on shielding effectiveness. The limitations andadvantages of superconducting shielding structures are also discussed.