Axial Ratio Circular polarization conversion (CP) Axial Ratio Axial Ratio Circular polarization conversion (CP) of the proposed Metasurface is further established by the axial ratio (AR) of the reflected wave, 𝐴𝑅 = ( |𝑅𝑦𝑦| 2 +|𝑅𝑥𝑦| 2 +√𝑎 |𝑅𝑦𝑦| 2 +|𝑅𝑥𝑦| 2 −√𝑎 ) 0.5 Where a = (|Ryy| 4 + |Rxy| 4 + 2|Ryy| 2 |Rxy| 2 cos(2ΔØyx) and ∆∅𝐲𝐱 = ∅𝐲𝐲 − ∅𝐱𝐲 The reflection coefficient of the design surface is shown in Figure. The co-polarized and cross-polarized reflected waves have the same magnitude at 9.6 GHz and 17 GHz is 0.7. The surface behaves at these points as a CP which converts the linear EM wave into a circular EM wave. The numerical value of the axial ratio is shown in Figure. At 9.6 GHz and 17 GHz, the axial ratio value is lower than the 3dB dotted black line which shows that the design surface has the ability of CPC, to convert 9.6
Surface current distribution
Charge flow over a surface we describe by a surface current density.
𝐾 = 𝑑𝐼 𝑑𝑙
‘k’ is the current per unit width, which will vary from point to point over the surface. When the flow of charge is distributed throughout a three-dimensional region we call it by volume current density and represented by J.
𝐽 = 𝑑𝐼/𝑑𝑎 (𝑐𝑢𝑟𝑟𝑒𝑛𝑡 𝑝𝑒𝑟 𝑢𝑛𝑖𝑡 𝑎𝑟𝑒𝑎)
The above results are gotten from CST software simulation.
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