Innovative Integration of High-Performance Floating Patch Antennas in Empty Substrate Integrated Waveguides

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

In this article, the authors have presented the design and implementation of the floating patch antenna integrated into an ESIW fed by a metallic rod. The proposed antenna is designed to operate in the X-band. It is excited by a metallic rod that connects the patch and the ESIW line, resulting in excellent performance in terms of measured radiation efficiency and -10 dB impedance bandwidth. The presented research work is interesting however, I do not recommend its acceptance in its present form.    

• There are lots of research article related to antennas are reported X-band as well as the radiation efficiency and directivity/gain is very attractive as compared to [11] as presented in Table 2. I think, the authors must provide the main motivation behind this research work as well as present the contribution in bullet form.
• How does the structure parameters present in Table 1 computed? Detail discussion is required.
• 5 and Fig. 6 can be put in one Figure as (a) and (b). I did not find detail discussion and presentation related to the simulation results. How does this antenna parameters optimized as well as simulated? Is it using CST MWS or Ansoft HFSS?
• The measurement details concerning to the set up with results regarding gain/directivity as well as radiation pattern need to present.

Comments on the Quality of English Language

English could be improved to more clearly express the research.

Author Response

Please, find attached the reply to your valuable comments.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

This manuscript presents an floating patch antenna in empty SIW with high performance. The topic is interesting, and the manuscript is well-organized and well-written, which contains numerical simulations, fabrication and measurement results in a quasi-comprehensive manner. However, in current version, it still contains several concerns.

1. The design fundamental theory analysis is lacked in this work. Actually, some basic design formulas, design rules or equivalent circuit model synthesis is essential to support the design.
2. In the Abstract and Introduction, as well as in the Conclusion, what is the main innovation, novelty and selling-point of the proposed design?
3. In the comparison, Table 2, it seems that the main advantages of the proposed antenna is its larger bandwidth. Meanwhile, the measured radiation efficiency is quite good. However, it should be noted clearly that the efficiency is the largest value at the specified frequency. Moreover, the measured directivity is worse than the works in [11] and [29], please discuss this point.

Author Response

Please, find attached the reply to your valuable comments.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Comments and Suggestions for Authors

In the revised manuscript, the authors have incorporated almost all the comments and suggestions raised by the reviewer. Therefore, I would like to recommend the acceptance of this manuscript for publications.