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Schemetic view of two antennas over the RISs (a) Uniform RIS, (b) Non‐uniform RIS

Schemetic view of two antennas over the RISs (a) Uniform RIS, (b) Non‐uniform RIS

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Schemetic view of a single‐feed CP microstrip antenna, lf=4mm,...
MS and characteristic angle of the corner‐truncated patch antenna (a)...
Modal currents at 7.18 GHz
Simulation results of RIS, p=7.5mm, h1=3mm, h2=0.5mm (a) Unit cell of...
+12 Two types of RIS structures, p=7.5mm, a0=6mm, a1=5.5mm, a2=6.5 (a)...
Use of non-uniform RIS and parasitic strips to improve antenna CP performance
Article
Full-text available
  • Sep 2020
The effect of using a non‐uniform reactive impedance surface (RIS) on the circular polarisation performance of a planar antenna is investigated. It is shown that a very wide axial ratio (AR) bandwidth can be obtained, especially when the RIS is combined with parasitic strips. This result is only possible, thanks to the fact that the RIS is non‐unif...
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