Fig. 1

Different types of foams. Three different types of foams are enlisted in a–c. a Open-celled polyurethane foam which is a tough substance with outstanding cushioning and protective qualities. Polyethylene foam gives the tough, light, closed-cell qualities required, protecting delicate electronics or giving athletic equipment comfort and support. It combines strong resistance to chemicals and moisture with good vibration-dampening and insulating qualities. Compared to polyurethane, this is more rigid as shown in b. EVA stands for ethylvinyl acetate. EVA foam refers to a closed-cell ethylvinyl acetate copolymer that is often given in the form of plates and is offered in a wide range of densities and colors as presented in c. Among all these types of foam as shown in this figure, EVA is the best suitable candidate from flexibility, bending, and water resistance points of view. It also makes antenna fabrication easier and more conformal