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By National Council on Radiation Protection and Measurements

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Read Online 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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Extra info 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)

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The magnitude of the velocity of propagation is given by v = ( p ~ ) - %The . velocity is less and the wavelength is shorter for a wave propagating in matter than for a wave propagating in free space. 16 shows a plane wave. E and H could have any direction in the plane, so long as they are perpendicular to each other. Far away from its source, a spherical wave can be considered to be approximately a plane wave in a limited region of space because the curvature of the wavefronts is so small that they appear to be almost planar.

This term has traditionally been associated with the effective heating value of an electrical current or voltage. For a general periodic function At), the definition of the rms value F is: where to is any value of t, and T is the period of the function. 23 shows that the rms value is obtained by squaring the function f(t), to obtain f(t), integrating the square of the function over the period, dividing by the period, and taking the square root. Integrating over a period T is equivalent to calculating the area between the function, f(t), and the t axis.

1 1 Antennas Antennas are devices used to radiate or receive RF energy, generally for purposes of communication or broadcasting. The antenna for a radio station accepts power from the transmitter and radiates 46 1 2. BASICCONCEFTS this power in various directions away from the antenna. Depending upon the application, antennas may possess radiation characteristics tailored to specific requirements. Knowledge of the radiation characteristics of an antenna is required for calculating the expected RF fields associated with the antenna.

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