Comparison of MM-Wave WPT With Single and Multiple Fresnel Zone Lens Using High Density Polyethylene

The fresnel zone lens (FZL) in this research work is designed using high-density polyethylene (HDPE). HDPE is characterized for the 28 GHz frequency by making it a super-substrate of the micro-strip patch antenna. The use of the HDPE as the FZP is proposed due to its lower density (950 Kg/m
³
) and also lower dielectric loss tangent (0.6e-4). A comparison between the single and multiple FZL having the same focal length (L) is shown. The multiple FZL help to increase the power transfer to larger distance efficiently compared to single or no FZL. In this study, the F/D = 0.5 with the F = 100 mm, and D is the diameter of the lens. The measurements of the received power without FZL, with single FZL, and two FZL is done. An improvement of 4 and 36 times in received power is achieved for one and two FZL lenses, respectively, at a 515.05 mm distance.