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The envelope correlation for a two-element antenna array may be calculated using the antenna radiation fields, or more simply from the scattering parameters of the system. The use of scattering parameters provides a major simplification over the direct use of field data. In this paper we propose a modification of the scattering parameter method which also includes the antenna losses. This approach...
A new approach to the design of electronic beam steering in antenna arrays is introduced and analysed. The technique is demonstrated for a uniform antenna array structure. The radiation pattern of the antenna array is formed and the beam steering tuned using the Genetic Algorithm. The results show a reasonably wide steering angle with acceptable experimentally-measured return loss. A simple mathematical...
In recent years, electromagnetic dosimetry has been increasingly oriented towards the evaluation of energy deposition in the human body due to an exposure to cellular telephones. In this case of near-field exposure, the significant dosimetric parameters are the specific absorption rate (SAR). This kind of definition causes a technical problem, because the SAR inside a person cannot be measured. Therefore,...
Electromechanical coefficients of kt, k33' and k33 of (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) single crystals were mainly investigated for various medical ultrasonic applications. The [001] poled PMN-PT wafers exhibit relatively high kt (62%), which is larger than that (49%) of conventional Pb(Zr1-x, Tix)O3 (PZT) ceramics. Accordingly, the pulse wave of 2MHz TCD probe manufactured with the PMN-PT wafers...
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