Standard Test Method for Measuring the Electromagnetic Shielding Effectiveness of Planar Materials

Importancia y uso:

4.1 This test method applies to the measurement of SE of planar materials under normal incidence, far-field, plane-wave conditions (E and H tangential to the surface of the material).

4.2 The uncertainty of the measured SE values is a function of material, mismatches throughout the transmission line path, dynamic range of the measurement system, and the accuracy of the ancillary equipment. An uncertainty analysis is given in Appendix X1 to illustrate the probability of uncertainty achieved by an experienced operator using good equipment. Deviations from the procedure in this test method will increase this uncertainty.

4.3 Approximate near-field values of SE can be calculated for both E or H sources by using measured values of far-field SE. A program can be generated from the source code in Appendix X2 that is suitable for use on a personal computer.

4.4 This test method measures the net SE caused by reflection and absorption. The reflected and absorbed power measurement is accomplished by the addition of a calibrated bidirectional coupler to the input of the holder.

Subcomité:

D09.12

Referida por:

B0904-00R21

Volúmen:

10.02

Número ICS:

17.220.20 (Measurement of electrical and magnetic quantities)

Palabras clave:

electromagnetic shielding; far field; near field; shielding; shielding effectiveness (SE) ;