In this paper, the effect of the human body attenuation on the radiation pattern of piezoelectric transducer arrays is investigated. We analytically demonstrate thst, for continuous wave excitation, the medium losses can be modeled as a symmetrical weighting function, acting off-axis in the observation plane, with a width decreasing with the covered distance. Radiation patteras computed using this model and using a more accurate expression are presented for a sparse 2D array under continuous and pulsed wave operation.
Comparisons betwecn the results obtained with and without attenuation are also shown.