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Axial Ratio Axial Ratio Circular polarization conversion (CP)

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
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Triple-band cross-polarization-conversion metasurface (CPCM)

 Triple-band cross-polarization-conversion metasurface       (CPCM)

  • This paper describes a thin triple-band cross-polarization-conversion metasurface (CPCM) made up of square split ring resonators (SSRR) and metallic cross elements with four metal strips housed inside the SSRR. The SSRR resonator and back layer are made of copper on an FR-4 substrate, which sandwiched the resonator and back layer. On a dielectric substrate, the SSRR and metallic cross elements are created.


  •  A copper layer blocks the backside. The metasurface is designed and analyzed using CST MWS 2018. At a lower frequency of 5.49 GHz, the electrical dimension of the CPCM structure is 0.128 0.128 0.044. The CPCM achieved a bandwidth of 5.35 to 5.69 GHz, 7.60 to 8.76 GHz, and 12.41 to 13.96 GHz across the S, C, and M bands and the X frequency band. Furthermore, the CPCM simulation result is validated through experimental development. The proposed structure is identical in polarization responses (up to 750) at normal and oblique incidents above the specified frequency band due to an electrically thin substrate. The surface current distribution is investigated in order to comprehend the structural mechanism underlying the unit cell's polarization conversion.

 

Paper Link:https://www.sciencedirect.com/science/article/pii/S2211379722002881




Simulation File:
https://www.youtube.com/watch?v=tzyNNWMCeKA

 


 




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