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
How to design metamaterial in CST || An Ultra-thin Wide-Angle Cross Polarization Conversion Metasurface
An Ultra-thin Wide-Angle Cross Polarization Conversion Metasurface In this article, a bandwidth-enhanced metasurface has been designed using a single circular split ring as a unit cell on the top surface of a metal-backed FR4 substrate. The structure behaves as a cross-polarization conversion (CPC) metasurface over full width at half maxima (FWHM) bandwidth of 12.94 GHz ranging from 9.44 GHz to 22.38 GHz. The proposed CPC metasurface maintains bandwidth enhancement up to 45° incident angles under both TE and TM polarizations. The structure is ultra-thin (~ /11.4 with respect to the center frequency) in nature. Due to its compact nature, studies on metasurface have become a hot topic of research as its application toward frequency selective surface (FSS). These FSS structures have been proposed as filters, absorbers, polarizers, etc. Recently, metasurface-based cross-polarization conversion (CPC) structures have been reported over a broad range of frequencies f