Triangular Slot-Loaded Wideband Planar Rectangular Antenna Array for Millimeter-Wave 5G Applications
Round 1
Reviewer 1 Report
In this paper a design of a tringular slot-loaded planar rectangular antenna array for wideband millimeter-wave 5G communication systems is presented.
The paper includes an updated state of the art and results are compared in terms of array size, array elements, frequency range, bandwith, efficiency and gain versus 8 previous developments.
Please consider the following aspects which require to be amended:
- Section 2.2 "Design Procedure": The justification of the integration of the triangular slot to pass from "Antenna 1" to "Antenna 2" configuration should be further explained.
- Section 3 "Feed Network and array Design": The parametric studies to define Wf should be explained in the paper in order to justify this parameter value.
- Section 4 "Simulated and Measure Results": When presenting Table 2, it is stated that "the gain of the antenna can be increased, extending the number of array elements as described in [13]". If possible, it would be interesting to check this effect considering the proposal, even if the overall array size is increased.
Finally, the level of the use of the English language is unsatisfactory to be included in this publication. Authors whose primary language is not English are advised to seek help in the preparation of the paper. Please consider the following examples:
- Lines 14-15: ... many research societies and industries (are) now focusing
- Line 31: ... need to (be) carefully select....
Author Response
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Author Response File: 
Author Response.pdf
Reviewer 2 Report
The paper presents an antenna array for 5G communication systems. The proposed antenna array consists of four triangular slot-loaded planar rectangular antennas. The design process is presented in detail. The design parameters were optimised. Several simulations were executed to evaluate the proposed system. Measurements were also performed on the real version of the antenna array in real circumstances. The paper contains several figures to present the results of the evaluations. The proposed system was compared with previously presented antenna arrays. The comparison shows that the proposed system has the largest bandwidth, and it belongs to be the best ones in terms of size, efficiency, and gain.
The optimised design parameters are presented. The paper presents how the feed line position was selected. However, it is not clear for most of the parameters how they were optimised. It would be interesting to present the applied optimisation processes for other parameters as well.
Some further comments:
- Please define S11 at the first occurrence in the text.
- Line 179: Instead of abbreviation "leq", use the whole expression.
- Line 243: The sentence contains word "than" although it does not contain comparison grammatically.
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
The authors present a “Triangular Slot-Loaded Wideband Planar Rectangular Antenna Array for Millimeter-wave 5G Applications”. Overall, the paper is well written, and the technical details are fully explained. However, I have some suggestions below for further improving the manuscript.
- The introduction should be clear. Why the author discusses the references (5 to 12) without comparing in the Table 2. It doesn’t fit in the introduction without discussing the drawbacks of previous work.
- What is the measured radiation efficiency.
- In Fig. 16, E and H plane should be plotted separated.
- Table 2 shows that the proposed design has average gain of the antenna ~ 12 dBi between frequency 26-45 GHz which doesn’t look in the Fig. 15
Author Response
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Author Response File: Author Response.pdf
Reviewer 4 Report
- I suggest authors to reduce the self-citation since currently the paper is composed of 25% self-cited papers.
- Please put full name before abbreviations such as : mm-wave (line 20)
- Line 47, Horn should not be written in capital letter. In line 112, Antenna and proposed should not be written in capital letter. I suggest to ask a native speaker to read the manuscript to improve the readability and eliminate the grammar mistakes.
- Please put units in Table 1.
- Please use unique definition for 5G. In the text, there is definition as 5G network, and also 5G communication system. It would be nice the authors use only one description.
- Could you please give more details the measurement setup for the S parameters ? Did you use a vector network analyzer or some other measuring equipment ? It would be nice author provide a small explanation in the text and provide a photograph for the experimental setup.
- It would be nice if the authors comment on the phase noise limitations for 5G RAN. Millimeter wave signals are negatively degraded from the phase noise. Is there any requirement of the local oscillator specifications in the base station for the proposed antenna design. In other words, is there any requirement for signal quality for frequency up and down converted signal in the base station for antenna communication. The phase noise of the signal may negatively influence the antenna comunication.
- I suggest to revise table 2 with newer references. I don't agree with comparison of the proposed antenna with self-cited papers. Maybe 1/2 self-cited reference can stay in the table but please reduce them. Currently 5/8 are self cited papers in table 2.
- The paper should be re-organized again. The text and figures are quite separated from each other. For instance, the authors describe figure 13 in page 8 and figure 13 is given in page 11. Please re-organize the paper so text and figure should be near each other.
- The authors should re-organize the figure 5. Please place the scale in the same line with simulation results. In addition, the authors should comment on why the current distribution is very low on the antenna surface. Is it as designed ?
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 1 Report
Once the required aspects have been amended, the paper can be accepted.
Author Response
The manuscript has been checked for grammatical and spelling errors. The observed errors have been corrected in the revised manuscript.
Reviewer 3 Report
The authors have addressed all of my concerns.
Author Response
The manuscript has been checked for grammatical and spelling errors. The observed errors have been corrected in the revised manuscript.
Reviewer 4 Report
I do not have much comments, since authors revised the text as I suggested. I only ask authors if they can provide the requirements of the local oscillator phase noise in order to have a stable antenna communication for 5G antenna in base station.
Author Response
1. The manuscript has been checked for grammatical and spelling errors. The observed errors have been corrected in the revised manuscript.
2. Local oscillator phase noise is constant for elements on one tile, but independent over different tiles, and therefore affects multiuser detection in a nontrivial manner. A modular architecture with fixed-size tiles can be used to scale all-digital mm-wave multiuser system by increasing the number of tiles, keeping oscillator noise characteristics, bandwidth and load factor fixed.
