FIELD: protecting persons against radiomagnetic waves within radio- frequency range. SUBSTANCE: protective device primarily designed to protect users of portable radiophones and radio stations against electromagnetic radiation is made of insulating material which distorts antenna magnetic field within closest area so that in vicinity of head it has magnetic value. Device is made in the form of disk having diameter D, thickness h, and dielectric constant of material ε; it is disposed between radio-transmitting device and person's head with its surfaces facing them. Dimensions of mentioned member are found from following equation: 
where H is averaged diameter of human head; λ is radio-radiation wavelength. EFFECT: improved convenience in use. 1 dwg
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