Abstract-The objective of this paper is to identify a suitable coating material in order to tune the microwave radiation and produce absorption losses for Wi-Fi devices. It is also desirable to obtain high absorption losses outside the Wi-Fi microwave frequency range of 2.4 GHz. Literature reviews of several types of material are described and compared for the use of the selected material in order to coat a Wi-Fi device for the desired absorption losses for that device. The selected material for the Wi-Fi device is usually a metal material or a combination of metals like Aluminium in polymer matrix with different types of composites. The choice of materials will aim to target the tuning of the electromagnetic spectrum at a frequency in the range of 2.4 GHz. The paper focuses on two groups of polymer materials; conducting material as a result of composites like Carbon Nanotube Composites (CNC) or other metal composites. The second group is the Intrinsic Conducting Polymer (ICP) which conducts as a result of doping with other materials. A third group is the highly conductive metals like copper and aluminum. The metals are used as a reference comparator to the other two groups.

Abstract-In this paper COMSOL model is used to modelthe s-parameters of the electromagnetic shielding of layer/layers of Polyaniline (PAni) for Wi-Fi Electromagnetic Interference (EMI) shielding. PAni has a good future for minimizing the problems with Electromagnetic Shielding (EMS), and will be increasingly be used to provide protection from Electromagnetic Radiation (EMR) and Electromagnetic Interference (EMI). With the increased development in Wi-Fi and telecommunications equipment, a simple model is required to test for transmission losses. In this paper the electromagnetic radiation from antenna, positioned 30cm from PAni shielding device is modelled using COMSOL 4.2. The paper predicts the radiation reduction after using PAni shielding device. The prediction of electromagnetic radiation distribution with PAni shielding device is simulated, the focus of the simulation is on the Wi-Fi microwave frequency of 2.45 GHz and the modelling of the PAni as an Intrinsic Conducting Polymer (ICP) for transmission losses that was obtained from the COMSOL simulation is compared with PAni shielding test data obtained from the experiential set up. The COMSOL model is used to predict both the electric field intensity around the PAni material and establish the plot of transmission losses.

In this paper it is shown that the data obtained from an open air shielding experiment for Polyaniline (Pani) can be simulated using COMSOL4.3b, and the results of the simulation correlate with the experimental results. Pani belongs to the family of Intrinsic Conducting Polymer (ICP), by comparing the results between the transmission loss data (S21) that was obtained experimentally with the simulated results; it is possible then to predict the transmission loss (S21) of the ICP materials and benefits from its use in electromagnetic shielding. The benefits of using ICP are shown in terms of the range of transmission loss that cover compared to the current carbon and metal based materials are demonstrated. The experimental results are shown that the transmission loss (S21) of the ICP materials varies and depends on its conductivity, permittivity, and permeability. This article establishes that Electromagnetic Radiation (EMR) measurement simulated by COMSOL 4.3b provides valid results. This simulated model has advantages in EMC design with better cost effectives design that include less Electromagnetic (EM) reflection, that will help to improve the functionality of any device that is based on ICP materials