An Ultra-Wideband Linear-to-Circular Polarization Converter Based on a Circular, Pie-Shaped Reflective Metasurface

Round 1

Reviewer 1 Report

Authors have presented an interesting work on an ultra-wideband and high efficiency reflective linear-to-circular polarization converter based on single-layer circular pie-shaped metasurface. Below comments would be helpful to improve the manuscript.

• Fig 1 (a): Text labelling font size may be larger.
• Add details on the modes and how RHCP and LHCP are impacted.
• It would be nice to have line spacing before and after the equations for better visualisation.
• Add reference for the equations where applicable.
• It is suggested to check the manuscript for typos and grammatical mistakes.

In conclusion, the work is good, supported with results and analysis, and is of interest for the research community.

Author Response

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Author Response File: Author Response.pdf

Reviewer 2 Report

The paper presents the design, analysis and simulation of An Ultra-Wideband and High-Efficiency Reflective Linear-to-Circular Polarization Converter Based on Single-Layer Circular Pie-Shaped Metasurface. The concept is exciting, and the simulation results are reasonably good, showing potentially strong reconfigurability. I have the following suggestions before accepting it for publication.

Title

Please minimize the title length. A good title should be short and more informative.

Abstract:

The authors mentioned, "The proposed metasurface unit cell looks like a  circular pie shaped with a microstrip in the centre", which is not correct. Based on the metasurface unit cell, it seems like a circular pie embedded with a rectangular patch. Please correct!!

- Please provide the fractional bandwidth (FBW in percentage)??

FBW (%) = ((FH-FL)/ Fc)) × 100

Introduction

The introduction is insufficient and needs to be improved. The authors must explain some of the Metasurface types. Frequency selective surface (FSS) is considered one of them. Please see these articles, which may add value to the introduction [1,2]:

[1] Enhancing Gain for UWB Antennas Using FSS: A Systematic Review. Mathematics. 2021; 9(24):3301. https://doi.org/10.3390/math9243301.

[2] Dual-Band Single-Layer Fractal Frequency Selective Surface for 5G Applications" Electronics 10, no. 22: 2880. https://doi.org/10.3390/electronics10222880.

3. Theoretical Analysis

In Figure 7c. The author proposed the reflection phase for the metasurface unit cell. From Figure 7c, the reflection phase decreases with frequency. This declining with frequency has several advantages, and the authors must clarify these advantages???

In Table 1. Please remove the red colour??

That's all for me at this moment!

Author Response

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Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

The authors have revised all the comments successfully. However, there are still minor things that need to be solved. 

• In figure 7, please make the parameters clear inside the figures:
• For example: r_uu, r_vv, etc...
• Please remove the AR equation from the Conclusion part.

Author Response

Please see the attachment

Author Response File: Author Response.pdf