Single layer dual wideband linear to circular polarisation converter with integrated parasitic elements

Area of Science:

• Electromagnetics and Wave Propagation
• Metamaterials and Plasmonics
• Antenna and Microwave Engineering

Background:

• Linear-to-circular polarization conversion is crucial for various wireless communication systems.
• Existing converters often suffer from narrow bandwidths or complex structures.
• Developing efficient, wideband converters remains an active research area.

Purpose of the Study:

• To present a novel single-layer, single-sided dual-wideband linear-to-circular polarization converter.
• To achieve wideband polarization conversion with high efficiency and stability.
• To demonstrate the converter's performance across a broad range of frequencies and incidence angles.

Main Methods:

• Design of a unit cell comprising diagonally oriented C-shaped metallic strips and parasitic strips.
• Integration of the unit cell onto an ultra-thin substrate.
• Numerical simulations and experimental validation of the polarization converter's performance.

Main Results:

• Achieved dual-wideband operation with fractional bandwidths of 86.3% (6.78-17.08 GHz) and 36.8% (25.09-36.40 GHz).
• Demonstrated near-equal transmission amplitudes and a stable 90° phase shift for effective polarization conversion.
• Obtained high and uniform total transmittance with consistent performance across wide incidence angles.

Conclusions:

• The proposed design offers a highly effective solution for dual-wideband linear-to-circular polarization conversion.
• The inclusion of parasitic strips is key to achieving the desired phase shift and wideband performance.
• The converter's robust performance makes it suitable for advanced microwave and millimeter-wave applications.