Design of a Low-Cost, Low-Sidelobe-Level, Differential-Fed SIW Slot Array Antenna with Zero Beam Squint
Round 1
Reviewer 1 Report
This paper presents an interesting work SIW slot array antenna. Overall the paper presented well with a sufficient contribution for publication. However, to improve the paper please address the following minor comments:
1. Please put Fig.1 under section 2.
2. Fig 4a, please show the full response of S11. Cannot see the resonant frequency.
3. Fig 9, please show the full response of S11.
Author Response
Dear editor of Applied Sciences,
I would like to thank you very much for your disposition on my paper (applsci-1949398, title: “Design of a Low-Cost Low-Sidelobe-Level Differential-Fed SIW Slot Array Antenna with Zero Beam Squint”). Based on the reviewer’s comments, the paper has been revised. The revised sections are notated in highlighted text in the PDF file. The detailed responses for the review comments are attached in a separated file. We greatly value this chance to revise our manuscript.
Your consideration is very much appreciated.
Best regards,
Keum Cheol Hwang, Ph.D.
Professor
School of Electronic and Electrical Engineering
Sungkyunkwan University
2066, Seobu-ro, Jangan-gu, Suwon
Gyeonggi-do, South Korea, 440-746
Tel: +82-31-290-7978
Fax: +82-31-290-7978
E-mail: [email protected]
Author Response File: 
Author Response.pdf
Reviewer 2 Report
The authors have presented a SIW Slot Array Antenna. Overall, the paper is in well presented form and covers the desired aspects. However, I have few observations that may be addressed:
1) I can see very old references added in the reference section. Therefore, authors are requested to discuss the latest references in the introduction section such as:
A. Iftikhar et al., "Planar SIW Leaky Wave Antenna With Electronically Reconfigurable E- and H-Plane Scanning," in IEEE Access, vol. 7, pp. 171206-171213, 2019, doi: 10.1109/ACCESS.2019.2953780.
A. Iftikhar et al., "Planar SIW Leaky Wave Antenna With Electronically Reconfigurable E- and H-Plane Scanning," in IEEE Access, vol. 7, pp. 171206-171213, 2019, doi: 10.1109/ACCESS.2019.2953780.
2) The comparison table discusses only 3 references. Authors may add at-least 3 to 5 more papers to compare their results.
3) Similarly, the older references of 1970s, 1980s may be ommitted.
Author Response
Dear reviewer,
I would like to thank you very much for your disposition on my paper (applsci-1949398, title: “Design of a Low-Cost Low-Sidelobe-Level Differential-Fed SIW Slot Array Antenna with Zero Beam Squint”). Based on the reviewer’s comments, the paper has been revised. The revised sections are notated in highlighted text in the PDF file. The detailed responses for the review comments are attached in a separated file. We greatly value this chance to revise our manuscript.
Your consideration is very much appreciated.
Best regards,
Keum Cheol Hwang, Ph.D.
Professor
School of Electronic and Electrical Engineering
Sungkyunkwan University
2066, Seobu-ro, Jangan-gu, Suwon
Gyeonggi-do, South Korea, 440-746
Tel: +82-31-290-7978
Fax: +82-31-290-7978
E-mail: [email protected]
Author Response File: Author Response.pdf
Reviewer 3 Report
Comments for Transmittal to Author
In this manuscript, authors presented their works on SIW based slot antenna array for X-band application. Authors have demonstrated a critical design and developed novel feeding techniques from waveguide to SIW. The work is important, considering the high power and compact antennas are needed for 5G and smart radar systems. However, the manuscript need a revision. Many places the observations are missing which are important to carry the research for a long run. Also, few techniques are introduced without a clear fundamental aspect. Therefore, authors need to revise the manuscript in a great deal. They shall use the following comment to improve the quality of presentation:
Major Comments:
1. In the title, authors explicitly mentioned “Beam Squint”, but the literature survey on it is weak. On the other hand, the technology survey in paragraph 2 of introduction lists various reports on SLL reduction and achievements. It is better to write the reasons for such reduction and why those methods are successful or not in detail.
2. Fig. 1 present the 3D side view of the proposed SIW slot antenna with power dividers. Although authors have put best effort to show the layer, last two layer are not visible clearly. Is it possible to improve the visibility?
3. Authors mentioned that a virtual short due to the differential-feed shall contribute to the broadening of impedance bandwidth. While the theory of virtual short for differential-feed is convincing, the bandwidth enhancement is not clear. Authors simply mentioned the important observation as “As a result”. Can you elaborate or give a short note on the exploring possibility of such bandwidth enhancement for the readers or fellow researchers.
4. In Fig. 2 (e), it shall be observed that the beam squint is extremely low for center and differential feedings. It is clear that all elements are in-phase even beyond the center frequency. The huge reduction in SLL (for the first side-lobe, I think) is evident that the slot elements have significant phase differences at other directions which effectively reduce the radiated power at minor lobes. Can you elaborate the phenomena?
5. In table-1, authors have written the transmission coefficients (Sn1) at 10 GHz. How the values -11.64 dB, -5.40 dB and -2.08 dB are obtained from Fig. 4 (a)?
6. At the waveguide-SIW transition, authors have added a rectangular patch (of same size as the input waveguide) to enhance the coupling. Does this fact hold any ground? Can you cite the relevant articles? While matching posts are given at outputs of E-junction, how coupling patch can improve the performance? Can you describe the performance of coupling patch, by providing parametric analysis?
7. Study of beam squint is not detailed as that of Fig. 2 (e) for the final antenna.
Minor comments:
1. In the title, authors mentioned that the presented antenna array is low-cost. Is there any justification to claim in the title of the paper?
2. There a is statement “For synthesizing a slot array, a well-known and accurate design procedure was proposed by Elliott,”. I hope, it is Elliott et al., - Kindly check the authorship of proposed method, as per given reference
3. There are multiple names for differential feed as “difference-feed”, “different-feed”. Try to use any one throughout the paper.
Author Response
Dear reviewer,
I would like to thank you very much for your disposition on my paper (applsci-1949398, title: “Design of a Low-Cost Low-Sidelobe-Level Differential-Fed SIW Slot Array Antenna with Zero Beam Squint”). Based on the reviewer’s comments, the paper has been revised. The revised sections are notated in highlighted text in the PDF file. The detailed responses for the review comments are attached in a separated file. We greatly value this chance to revise our manuscript.
Your consideration is very much appreciated.
Best regards,
Keum Cheol Hwang, Ph.D.
Professor
School of Electronic and Electrical Engineering
Sungkyunkwan University
2066, Seobu-ro, Jangan-gu, Suwon
Gyeonggi-do, South Korea, 440-746
Tel: +82-31-290-7978
Fax: +82-31-290-7978
E-mail: [email protected]
Author Response File: Author Response.pdf
