August 2012
Beginner to intermediate
480 pages
17h 31m
English
Content preview from Satellite Newsgathering, 2nd Edition
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Appendix I
Formulae for calculating non-ionizingradiation levels
Non-ionizing radiation is measured in a number of ways, but in practice for microwave equipment, the safety limits are often expressed as power density levels, in W/m2 or mW/cm2 as these can be easily measured.
The near-field region is the region in general proximity to an antenna in which the electric (E) and magnetic (H) fields do not have a substantially plane-wave character, but vary considerably from point to point. In other words, as the signals are not necessarily in phase at any single point, the sum of the signals do not add up in-phase.
The far-field region is that region of the field of an antenna where the angular field distribution is essentially independent of ...
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