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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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A multiband circular polarization selective metasurface for microwave applications.

Syed Muhammad Qasim Ali Shah¹, Nosherwan Shoaib², Fahad Ahmed¹

¹Research Institute for Microwave and Millimeter-Wave Studies (RIMMS), National University of Sciences and Technology (NUST), Islamabad, 44000, Pakistan.

Scientific Reports

|January 20, 2021

Summary

This summary is machine-generated.

This study presents a novel multiband circular polarization selective (CPS) metasurface. The designed chiral metasurface demonstrates efficient polarization control across multiple frequency bands, suitable for advanced applications.

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Area of Science:

Electromagnetics and Metamaterials
Applied Physics
Electrical Engineering

Background:

Metasurfaces offer unique electromagnetic properties.
Circular polarization selective (CPS) surfaces are crucial for advanced communication and sensing.
Chirality in metasurfaces enables novel polarization manipulation functionalities.

Purpose of the Study:

To design and demonstrate a reciprocal bi-layered chiral metasurface with multiband CPS capabilities.
To investigate the polarization conversion performance for both y-polarized and x-polarized incident waves.
To evaluate the angular stability and potential applications of the proposed metasurface.

Main Methods:

A reciprocal bi-layered metasurface was designed using circular split-ring resonators with an internal cross shape.
Chirality was introduced by rotating the bottom layer structure by 90° relative to the top layer.
Electromagnetic simulations and analysis were performed to characterize the transmission and polarization extinction ratio (PER).

Main Results:

The metasurface achieved CPS capability between 5.18-5.23 GHz for y-polarized waves with transmission up to -4 dB and PER up to -27.4 dB.
Three operating bands for x-polarized waves were achieved at 10.64-10.82 GHz, 12.25-12.47 GHz, and 14.42-14.67 GHz.
A maximum PER of 47.16 dB was recorded at 14.53 GHz, with stable performance up to 45° oblique incidence.

Conclusions:

The proposed chiral metasurface exhibits robust multiband CPS functionality.
Its simple structure, angular stability, and miniaturized size make it suitable for polarization conversion and biomedical applications.
This work contributes to the development of advanced metasurface-based electromagnetic devices.