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A dual layer wideband angular stable frequency selective surface for linear to circular and circular to linear
Akash Paramanik1, Krishnamurthy Chitti Venkata1, Venkatachalam Subramanian2
1Microwave Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, Tamilnadu, India.
Scientific Reports
|April 8, 2025
Summary
This study introduces a novel frequency selective surface (FSS) that efficiently converts between linear and circular polarizations. The proposed FSS offers high polarization conversion efficiency and wide bandwidth, making it suitable for advanced communication systems.
Area of Science:
- Electromagnetics and Applied Physics
- Metamaterials and Nanophotonics
Background:
- Polarization conversion is crucial for efficient wireless communication systems.
- Conventional methods for polarization conversion often suffer from narrow bandwidth, bulky structures, or limited angular stability.
Purpose of the Study:
- To propose and demonstrate a novel transmission-type frequency selective surface (FSS) for efficient linear polarization (LP) to circular polarization (CP) and CP to LP conversion.
- To achieve high polarization conversion ratio (PCR), wide operational bandwidth, and excellent angular stability.
Main Methods:
- Design and simulation of a dual-layer metallic frequency selective surface (FSS) with a dielectric substrate.
- The unit cell structure of the top and bottom metallic layers is identical.
- Analysis of polarization conversion efficiency, bandwidth, and angular stability.
Main Results:
- The proposed transmission-type polarization converter achieved a maximum polarization conversion efficiency (PCR) of 99.98%.
- A wide operational bandwidth of 23.8% was observed at 27.3 GHz.
- The structure demonstrated high angular stability up to 60 degrees.
Conclusions:
- The novel FSS design offers a low-complexity, tunable, and highly angularly stable solution for polarization conversion.
- This wideband, low-loss polarization converter is a promising alternative to conventional CP sources for communication applications.
- The design is adaptable to different frequency bands, including the 5G spectrum.
