Frequency Selective Surface for Ultra-Wide Band Filtering and Shielding
, Ladislau Matekovits 1,2,3, Adrian Buta 1, Gianluca Dassano 2 and Andrei Silaghi 1,*Round 1
Reviewer 1 Report
The authors presented a frequency selective surface for spatial filtering in the UWB frequency range. A wide stop-band ranging from 1.75 to 15.44 GHz has been obtained with good polarization insensitivity and an angular stability of more than 50-degrees.The work has enough contribution, however it needs some improvements.
- The presentation of the data should be improved, especially Figure 11. Plot in the same style as other graphs.
- Latest papers should be added in references to locate this work in state of the art work. Consider to the following papers published in MDPI journals: https://doi.org/10.3390/app8091689, https://doi.org/10.3390/app10249125, https://doi.org/10.3390/mi12091027
- Check equations, their numbering has been misplaced. Formate manuscript carefully in the revised manuscript.
- If possible, add reflection phase characteristics of the FSS as shown in [11].
- Comment on the usage of FR-4 substrate at high frequencies, as the FSS works upto 15 GHz. The dielectric properties of the FR-4 changes significantly at higher frequencies.
Author Response
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Author Response File: 
Author Response.pdf
Reviewer 2 Report
The authors present a sound FSS design. It would be very convenient, with respect to Figures 9 and 10, that experimental results are shown superimposed to simulated results, to actually check the level of agreement (i.e., at each incident angle).
With regard to the impact of higher-order modes, in view of Table 2, where it can be seen how there are propagating higher-modes in the considered frequency band (i.e. < 18 GHz), I am wondering if in each and every simulation the authors have ensured that no propagation of higher-order modes appear. The claim that "some minor differences...are caused... and by higher order modes that are launched as surface waves" should also be better explained, as I think CST Studio should be able to predict the behaviour due to this phenomenon in its full-wave simulation (not the radiation at the FSS boundary, but the appearance of surface waves).
Author Response
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Author Response File: Author Response.pdf
