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Electromagnetic fields

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Elektromagnetische Felder

High frequency electromagnetic fields

High frequency electromagnetic fields are used for speech and data transmission in mobile communication. Normally these fields are radiated by an antenna. In free space they propagate with the speed of light and thereby transmit energy and information on large distances. High frequency fields cover the frequency range from 100 kHz to 300 GHz of the electromagnetic spectrum.

A woman, using a tablet.

Smartphones and tablets

Just like classic mobile phones, smartphones use the same high frequency electromagnetic fields to transmit speech and data. Besides mobile communication connections, Smartphones can usually also make use of Wireless Lan (wi-fi). This is similarly the case for tablets: They use high frequency fields for wi-fi connections and often also have mobile communications inbuilt.

The BfS gives tips to reduce individual radiation exposure.

Zwei junge Frauen telefonieren mit Handy und Smartphone

Recommendations for mobile phones

Mobile communications use high-frequency electromagnetic fields to transmit information. Mobile phones generate these fields directly by the head when making telephone calls without using hands-free equipment. According to current knowledge, the internationally recommended limit values are sufficient to protect the user from proven health risks.

Specific Absorption Rates (SAR) for mobile phones

Mobile communication uses high frequency electromagnetic fields for information transmission. When talking to someone on a mobile phone, the energy of these fields is partly absorbed in the head. If a headset is used and the mobile phone is, for example, put in one’s pocket, the energy is absorbed by the body part close to the mobile phone. The specific absorption rate (SAR) is a measure for the energy absorbed by the body. Its measure is Watt per kilogram (W/kg)

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