Download High Frequency Electromagnetic Dosimetry by David A Sanchez-Hernandez PDF

By David A Sanchez-Hernandez

In addition to the expansion of RF and microwave expertise purposes, there's a mounting quandary concerning the attainable opposed results over human overall healthiness from electromagnetic radiation. Addressing this factor and placing it into point of view, this groundbreaking source offers severe info at the most recent advances in excessive frequency electromagnetic dosimetry. Written and edited by means of famous specialists within the box, the e-book takes a systematic and rigorous engineering standpoint, supporting execs in achieving hugely actual publicity checks.

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218–228, 2002. , “ Response, thermal regulatory threshold and thermal breakdown threshold of restrained RF-exposed mice at 905 MHz,” Phys. Med. , Vol. 50, pp. 5203–5215, 2005. , “Calculation of induced current densities and specific absorption rates (SAR) for pregnant women exposed to hand-held metal detectors,” Phys. Med. , Vol. 48, pp. 2551–2560, 2003. , “SAR in the mother and foetus for RF plane wave irradiation,” Phys. Med. , Vol. 52, pp. 3791–3802, 2007. 6 The Reason for Writing this Book 19 Union, L 159 of 30 April 2004, Corrigenda in Official Journal of the European Union L 184 of 25 May 2004.

2 Current Knowledge on Dielectric Properties The electrical properties of materials involved in dosimetry evaluations have been reported in the literature, and the typically used values are those of Gabriel [12], who made her study after the contribution of Herman P. Schwan [47]. It has to be mentioned, however, that dielectric measuring techniques may not be very accurate, particularly below 1 kHz, with errors affecting the dielectric parameters by up to a factor of two [12]. A polar dielectric material under an electric field is electrically polarized at the molecular and atomic levels, and the total polarization reaches a steady state as a first-order process when a step field is applied.

The measured capacitance is then used to calculate permittivity. In an actual test setup, two electrodes are configured with a test fixture sandwiching dielectric material. The impedance-measuring instrument would measure vector components of capacitance (Cp) and dissipation and a software program would calculate permittivity and loss tangent from these data. Several configurations can be used for measuring the capacitance of the material. In fact, the material can be in contact with the material to be measured or not.

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