Limitations of Shielding Effectiveness Measurements of Planar Materials using a DTEM Cell

This paper addresses issues encountered in a method for measuring the shielding effectiveness of planar materials using a dual transverse electromagnetic cell. The aim of this work is to evaluate the performance of the setup and to point out its strengths and weaknesses. The effect of placement of several materials varying in size and texture is examined. Additionally, techniques for improving the setup and therefore the measurement accuracy and sensitivity are presented. The size of the aperture is investigated by applying two different methods in order to observe its effect on the shielding effectiveness results. Restrictions and limitations of the measurement method are discussed and supported by experimental results.