In this paper, a new multilayer composite was prepared and built from alternating layers, the composite is reinforced by Titanium fibres and the dielectric layers made from the Silicon material, the dielectric layers are sandwiched between composites with Ti fibres symmetrically.
Ti is the most widely used metal for pacemakers due to its high biocompatibility with the human body.
2.1 Multi-layer structure composite as EMI shielding materials Electromagnetic shielding effectiveness EM SE is a measure of the material ability to attenuate EMI.
The multilayer structure gives the desired objectives as the results displayed a decrease of absorption mechanism by the increase of reflection due to the high electrical conductivity which enhance the total shielding effectiveness [10-11].
The efficient composite materials in shielding applications must be electrically conducting; the main responsible element for the conduction is the reinforcements in composite materials [24-26], several studies are reported on shielding materials like metallic coating, metallic fillers, and metallic fibers due to its excellent conductivity, permeability, and superficial skin depth .
The present paper has two aims; the first aim is to prepare a new multilayer composite to enhance the shielding effectiveness of composites, our proposed composite is made from Ti fibres dispersed in silicon (Si) matrix.This paper presents a novel method for evaluating the effect of human body temperature on the electromagnetic shielding effectiveness (SE) of pacemaker.There are many sources of electromagnetic interference that interact with pacemakers: Cell phones may be considered responsible for electromagnetic interference EMI when they were held in the same part with the pacemaker; also, the magnetic resonance imaging makes a serious problem and must be avoided.The effect of temperature on the electrical conductivity of Ti fibre, silicon matrix, and parameters of the electrical responses of the whole proposed composite sample are presented in Figure 3 and Table 1.3.1 The effect of temperature on EMI shielding properties Titanium (Ti) have better properties such as high conductivity, low cost, and light weight due to their enhanced contribute the better properties physical on a very large potential for many biomedical, electrical, structural, and electronic applications.This composite structure (Ti F/Si–Si–Ti F/Si–Si–Ti F/Si) can improve the electromagnetic interference EMI shielding effectiveness because the presence of layers permits to increase the reflection and multiple-reflection waves between the layers.The obtained results here prove the efficiency of our arrangement.The three-layers has the same arrangement containing 60 fibres (Ti F).With a conductivity σ=1.82*10 S/m, 0.035 mm radius, and 0.6 mm length embedded inside the dielectric layer (Si) a ɛ=11.9 and 0.5 mm thick.Silicon has the advantages for being resistant material of temperature, lightweight, and its flexibility (bendable structure).The obtained simulation results prove the effectiveness of the proposed shield in the temperature range 37-41 °C, this is mainly due to the multi-reflection mechanism between the layers due to the high mismatched impedances.