By John G. Webster (Editor)
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Extra info for 19.Electromagnetic Compatibility
However, in a real life situation where the telephone is used, this assumption is false. The human body absorbs the energy transmitted from the antenna, and the radiation pattern and antenna impedances are disturbed. Therefore a practical antenna design must take the body effect into account. In type 5, the human body absorbs the energy transmitted from the antenna, as mentioned above. Some people are afraid that physical damage can be caused by electromagnetic waves. Many consider them to cause cancer.
These telephones are very widely used, and people everywhere are beginning to become aware of telephone interference. This awareness often becomes a social problem, which is then picked up by the news media and further exacerbated. There are many kinds of portable telephone interference. Interference may be active or passive, and there are many reasons for its occurrence. In this article, telephone interference is classified and explained in accordance with the following categories. Here each type will be explained briefly.
In type 1, harmonics and spurious signals are generated in the RF circuit by its nonlinearity. To avoid this problem, frequencies, especially in the intermediate frequency (IF) range, need to be chosen very carefully. Sometimes filters are adequate to remove the interference. The telephone designer should consider all harmonics and their combinations. In type 2, the power radiated from the antenna onto its chassis affects the performance of the RF components. A typical example is a voltage-controlled oscillator (VCO) module.
19.Electromagnetic Compatibility by John G. Webster (Editor)