Advancing into Millimeter Wavelengths for IoT: Multibeam Modified Planar Luneburg Lens Antenna with Porous Plastic Material

Round 1

Reviewer 1 Report

1.      The introduction part is too long, suggest shortening this part, for example, the paragraph line 106-119 should be deleted, and if possible, the whole manuscript should be shortened and re-wrote briefly and elegantly. The authors mentioned 3D printing technology with different materials, but there are no different materials references listed in the references part, suggest looking for some recent publication on dielectrics or metal 3D printing for Lunenburg lens.

2.      The parameter η was mentioned in Fig.3, Fig.4 and Fig.5, but the values of η in Fig.3 are not the same with that in Fig.4a and Fig.5. So please clarify the physical meaning of parameter η and explain its role in equations.

3.      Theoretically, the feed sources should be located at focal points along the Lunenburg lens edge, but in this manuscript, the feed dipole antennas aligned along horizon. So please analyze its effects of this configuration on the radiation pattern.

The whole manuscript is a little bit of complicated, suggest to express in a more brief style.

Author Response

Thank you for your valuable feedback. Attached are the responses and the revised version for your review.

Author Response File: Author Response.pdf

Reviewer 2 Report

The analyzed paper addresses the field of antennas that a Luneburg dielectric lens of cylindrical shape, which is additively manufactured using the selective laser sintering process to create intergranular free spaces. It is proposed to study the modification of the reflection gradient of the antenna with the modification of its porosity.

From studying the work in the introductory part, the specialized literature is recommended to be completed with studies that have a publication period of less than 5 years. Also, from my point of view, the simple group reference of works from the specialized literature does not provide an aspect of an undertaken study and implicitly does not ensure a correct information of those who approach the study. For example line 78 [15-21] and similar.

In Chapter 2, references are made to the antenna, but also to the additive manufacturing method. I think it would have been better to use the reference using MATERIALS and METHODS with the related sub-chapters previously mentioned as chapters. In another vein, related to the additive manufacturing of antennas, no reference is made to the type of printer used and, respectively, the grain of the material, the additive manufacturing regime and the manufacturing process.

The experimental part is, from the point of view of the analysis of the antenna structure generated by additive manufacturing, far too brief. Also, the process of measuring the reflection gradient is not presented explicitly. The size of the text in the pictures is not in accordance with that of the text as an example Figure 11 and others.

Author Response

Thank you for your valuable feedback. Attached are the responses and the revised version for your review.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Thank you for your response and correction made.