By National Council on Radiation Protection and Measurements
Read or Download A Practical Guide to the Determination of Human Exposure to Radiofrequency Fields : Recommendations of the National Council on Radiation Protection A (NCRP Report No. 119) PDF
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Additional resources for A Practical Guide to the Determination of Human Exposure to Radiofrequency Fields : Recommendations of the National Council on Radiation Protection A (NCRP Report No. 119)
2 ELECTROMAGNETIC FIELDS / 33 6. The magnitude of the velocity of propagation (phase velocity) The velocity is less and the wavelength is given by v = (p)-%. is shorter for a wave propagating in matter than for a wave propagating in free space. Plane Waves. A plane wave is another model that represents approximately some actual EM waves, but true plane waves do not exist. 5 1. The wave fronts are planes. 2. E and H and the direction of propagation k are all mutually perpendicular. 3. EH-I = p%-% (called the wave impedance).
Plane-wave normally incident on a planar conductor. The conductor produces a normally scattered wave. conductor), the sum of the incident and the scattered fields must equal zero everywhere inside the conductor. 18(a) as a function of position for two different times, tl and t,. At any instant of time, the variation of the field with position is sinusoidal. At any position, the variation of the field with time is sinusoidal. 18(b). Note that at certain positions, the electric field is zero for all values of time.
The Poynting vector E x H is useful in understanding energy absorption, but it is important to realize that Poynting's theorem applies only to a closed surface and the volume enclosed by that surface. This will be illustrated after consideration of Poynting's theorem for time-averaged fields. Poynting's theorem for time-averagedpower and energy of steadystate sinusoidal electric and magnetic fields is of special interest. 28 is valid at any instant of time for fields of general time variation. For sinusoidal fields, however, the average of the time rate of change of energy stored in the electric and magnetic Fig.
A Practical Guide to the Determination of Human Exposure to Radiofrequency Fields : Recommendations of the National Council on Radiation Protection A (NCRP Report No. 119) by National Council on Radiation Protection and Measurements