How do mobile phones emit radio waves in comparison to other electric/electronic articles: microwave, PCs etc?
All electric devices emit a certain amount of radiation (electromagnetic fields). The radiation from mobile phones and other devices are not always comparable, since the frequencies can be very different. Our bodies have different limits of tolerance for the various frequencies, and the limit values take this into account. The strongest signals emit from devices that contain radio transmitters or high-voltage, such as wireless telephones, microwave ovens and TV/PC screens. Lamps and fluorescent tubes also emit more radiation than what is commonly assumed. The WHOs limit values apply for all such equipment, not only mobile phone systems. There is also a clear tendency that new TVs, PC screens and microwave ovens emit weaker radiation than their older counterparts. Radiation from mobile phones is of the same kind (i.e. approximately the same frequency) as microwave ovens and wireless phones. The radiation from a mobile phone in use will be just as modest as the radiation emitting from th
Mobile phones uses dipole type antennas so the signal energy radiation is omnidirectional(all direction), meaning that energy is radiated in spherical pattern with antenna at the middle of the sphere. Whereas, the microwave antenna uses parabolic shaped antenna which emits signal radiation in a particular direction. So microwave antenna are directional antenna, mobile phone dipole antenna are non-directional antenna(omni).
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