Reflection type Metasurface based Reconfigurable Linear to Circular Polarisation Converter for 5G/Sateilite Communication

A reconfigurable polarization converter is presented in this article. This is a single layer metasurface based broadband polarizer which is designed over an inexpensive substrate that is FR-4 and the unit cell dimension is
$14\ \text{mm} \times 14$
mm. The proposed method follows transmission line model and the simulation is based on full-wave Floquet analysis. A meander-line based unit cell is chosen for this polarization converter design due to its simplicity and flexibility from design point of view. This polarizer provides similar conversion capacity for TE and TM modes. A PIN diode is used to switching the frequency of polarization band. When the diode is ‘Off’, the conversion bandwidth reduced to 1.16 GHz (5.83 GHz to 6.99 GHz) and at ‘On’ condition of diode, the conversion bandwidth is 3.37 GHz expanding from 3.21 GHz to 6.58 GHz. The above bandwidth is considered over 90% Polarization Conversion Ratio (PCR) value. This polarizer can be useful in the C band satellite communication for LP-CP conversion at source antenna. Due to the reconfigurability, it can also be used in different bands of 5G communication.