The Attenuation Calculation of the Energy Signal of a Gaussian Pulse Propagating in the Human Body to Detect the Heart Beat
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This work is part of a project whose goal is the study of abnormal attenuation and distortion of the Ultra Wide Band signal "UWB" during its propagation in the human body to detect heart beats. This paper describes a method to determine the attenuation of the signal energy through the region of the body in the heart area; this region is modelled like the superposition of four semi-infinite layers, each characterized by its thickness, conductivity and dielectric constant. This method consists in seeking attenuation in biological samples of the same type as the layers forming the human body. Hence we deduce the overall attenuation in the total model. A comparison is made with other work that exists in the literature to show the robustness of our method. We adopt the FDTD method "Finite Difference Time Domain" to simulate the propagation of a Gaussian pulse whose pulse width varies from 1 to 10 GHz in these biological media. These samples should not be too thin not to have any energy fluctuation area along the sample, or too large not to risk dampening the signal especially for very short pulses. For this, we select 2.5 cm wide samples located 1 cm from the source (antenna).
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