Shielding Effectiveness Measurement Using a DTEM Cell


This paper presents a shielding effectiveness evaluation for some metallic threads materials. The tests were performed using a non-standardized method in a dual transversal electromagnetic cell (DTEM). The materials’ shielding characteristics must be properly evaluated in order to choose an appropriate shielding material. The tests were conducted for two different types of material designed for electromagnetic shielding. Material 1 has a low density structure, and Material 2 has a dense structure. The tests were performed with a non-standardized method which uses a simple and economical setup, in two different cases. For the first analyzed case only two components were used: a DTEM cell and an EMI Test Receiver. In comparison with the standardized methods, the non-standardized method one used, does not require large testing space and complicated setup, and the material probe needed for DTEM measurements is considerably smaller than the one necessary for the standardized tests. The second studied case comprised a DTEM cell, an EMI Test Receiver, and a hybrid junction. For the second case, the power level was measured with the hybrid junction connected at the inputs A and B, measuring the sum on the C port, and with the hybrid junction connected in the same way, but measuring the difference from the D port. Analyzing the obtained results with the non-standardized method, in all studied cases for the two materials, one can conclude that the shielding effectiveness is better for the high density material. images