An evaluation of a radiofrequency protective suit and electrically conductive fabrics

A protective suit consisting of an overall with an integral hood, gloves, and oversocks, constructed of an electrically conductive fabric, has been examined theoretically and experimentally for electromagnetic shielding effectiveness (SE) at radio frequencies (RF) in the range from 200 kHz to 4 GHz. The suit, although originally developed to provide personnel protection in large electric-field gradients near overhead high-voltage 50/60 Hz power transmission lines, was claimed to provide whole-body protection for RF workers. The authors describe the methods of measurement used and the experimental and theoretical results obtained, and provide details of the deficiencies in SE of the suit. In particular, it is shown that resonant enhancement of RF fields can occur in the head region at microwave frequencies, and that no attenuation is provided for magnetic fields at frequencies below about 4 MHz. Minimum design criteria to be observed in any such suits that may be developed in the future are proposed.<>