Review Reports

Round 1

Reviewer 1 Report

1.      The operating mechanism of the polarization conversion mechanism is absent.

2.      The authors use many equations. Do the authors develop all? If not, please refer them.

3.      From Fig. 8, there is no significant effect of all parameters on PCR. Why are they presented?

4.      The photograph of the prototype (Fig. 9) should be clear.

5.      The measurement is done from 16 to 30 GHz. How do the authors claim a frequency band of 9.83 – 29.37 GHz (Table 1)?

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

I would like to thank authors for the great work. This is a well-written paper with detailed discussion on analysis, simulation, and measurement results. I recommend accepting after minor revision.  Please see my comments and suggestions below:

1.      The proposed polarization converter design achieves both broadband performance and high angle stability at the same time. These 2 specifications together are better than the existing designs. Can authors discuss more about what’s limiting the angle stability when having a broadband structure, and how this design overcomes the limits? The innovation and significance of this work could be improved by adding this discussion.

2.     Line 54: Polarization conversion ratio (PCR) should be moved to line 51, where PCR is used for the first time

3.      Line 88: Please rephrase “The reflection type in couple with low loss substrate enable high conversion efficiency possible”

4.      Authors mentioned adding slots can improve the bandwidth. Can authors explain why? Some filed distribution figures with and without slots might be helpful to visualize the effect by adding slots. Is there any downside of adding slots?

5.      Line 169: Can authors explain more about why the miniaturization of the unit cell improves the incident angle stability? Is it possible to do some parametric sweep on incident angle vs the size of unit cell?

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

The manuscript can be accepted in its present form.