A Novel Hybrid Approach for Computing Electromagnetic Scattering from Objects with Honeycomb Structures

Round 1

Reviewer 1 Report

The proposed method balance the efficiency and accuracy of modeling semi periodic structures by combining two numerical method with  dedicated boundary condition. The method is useful and the results are convincing. Minor problem is some quantities in eq. are.not clearly defined when establishing the boundary condition with CFIE. 

The overall quality is good. I recommend this paper for publication after minor modification of this issues.

Author Response

Point 1: Minor problem is some quantities in eq. are.not clearly defined when establishing the boundary condition with CFIE.

Response 1:

Thank you for your comments. The quantities of CFIE equation is added in the revised manuscript.

Author Response File: Author Response.pdf

Reviewer 2 Report

Although I recommend the paper for publication, I have following questions:

1. The authors never reveal the parameters used for the resistive sheet. They need to justify the values they have used and must mention them.

2. As I gather from the manuscript, the value M>6 implies, the homogeneous region shrunk to a small region. Why not simply eliminate the homogeneous region and reduce the complexity of analysis? what happens then? Do we still get acceptable results? I think the authors should address these questions.

3. Comparing with FEKO is not a good idea because why should we trust them? Why not use the unit cell as an inhomogeneous body and model accordingly.

I think addressing these questions may improve the quality of the paper.

Author Response

Point 1: The authors never reveal the parameters used for the resistive sheet. They need to justify the values they have used and must mention them.

Response 1:

Thank you for your comments. The parameters used for the resistive sheet is added in Eq(3).

 

Point 2: As I gather from the manuscript, the value M>6 implies, the homogeneous region shrunk to a small region. Why not simply eliminate the homogeneous region and reduce the complexity of analysis? what happens then? Do we still get acceptable results? I think the authors should address these questions.

Response 2:

The RSBC approach holds a higher accuracy than the homogenization method at the price of a lower efficiecny. When the homogeneous region is eliminated, the proposed method is actually the RSBC method. In that case, although we can still get acceptable results, the computaiton resource cost is higher. Therefore, it is necessary to determine a suitable M value that can ensure both calculation accuracy and high efficiency. Through our numerical experimence, M>6 is acceptable.

 

Point 3: Comparing with FEKO is not a good idea because why should we trust them? Why not use the unit cell as an inhomogeneous body and model accordingly?

Response 3:

Thank you for your comment. Among different numerical methods, integral equation-based ones are believed to be accurate, as the Sommerfeld radiation condition is exactly incorporate into it through the use of an appropriate Green’s function. We use third-party software results as a comparison to enhance the reliability of the validation results, FEKO is just used for convenience. In the reivsed manuscript, we also compared the MoM results with FE-BI in HFSS, in which each unit cell is treated as an inhomogeneous body and model accordingly. As we can see, these results are in excellent agreement.

Author Response File: Author Response.pdf