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Electromagnetic fields
- What are electromagnetic fields?
- Static and low-frequency fields
- Radiation protection relating to the expansion of the national grid
- High-frequency fields
- Radiation protection in mobile communication
- What is mobile communication?
- High-frequency electromagnetic fields
- Mobile terminals
- GSM standard
- UMTS
- LTE
- Effects
- Protection
- Reports and evaluations
- What is mobile communication?
Optical radiation
Ionising radiation
- What is ionising radiation?
- Radioactivity in the environment
- Applications in medicine
- Applications in daily life and in technology
- Effects
- What are the effects of radiation?
- Effects of selected radioactive materials
- Consequences of a radiation accident
- Cancer and leukaemia
- Genetic radiation effects
- Individual radiosensitivity
- Epidemiology of radiation-induced diseases
- Ionising radiation: positive effects?
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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. The unit for the physical quantity frequency is called hertz (Hz), 1 Hz is equivalent to one oscillation per second. Frequency and wavelength of electromagnetic fields are linked by the speed of the travelling wave. The higher the frequency is, the shorter is the wavelength and vice versa. Far away from a radiating antenna the two components of the electromagnetic fields, the electric field and the magnetic field, are closely connected through the wave impedance of free space.
State of 2017.10.26