A Novel Asymmetric Patch Reflectarray Antenna with Ground Ring Slots for 5G Communication Systems
, Fauziahanim C. Seman 1,*, Muhammad Inam Abbasi 3, Adel Y. I. Ashyap 1, M. Ramlee Kamarudin 1 and Omar Hayat 4
Round 1
Reviewer 1 Report
- Some of the optimized parameters shown in table 1 exceed the range of the values L1 and W listed in Figure 3.
- The fabricated unit cells are located at the open end of the waveguide setup in Figure 5(b). As a result, the incident wave enter into the unit cell is not a TEM wave.
- Please enter the width of each ring slots on the ground plane shown in Figure 8(a).
- The authors should provide a description on the array periodicity and fabrication method of the proposed design shown in Figure 8(a).
- The author should provide a description on the first and second resonance shown in Figure 2. What is the center frequency of the first resonance ?
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Reviewer 2 Report
The manuscript presents experimental demonstration of a reflective surface or as the authors call it a reflectarray antenna.
The manuscript seems to be very similar with the previously published paper by the authors [4, where the designed structure looks similar to the one in [4]. The introduction of the paper should emphasize the difference between the present manuscript and their published paper [4].
The authors should note that their structure lies in the category of metsurfaces and frequency selective surfaces. Recently there has been a surge of interest on the applications of patch-based beam-steering metasurfaces [R1,R2]. The authors should compare the functionality of their structure with the one in [R1,R2] and mention the advantages and disadvantages of their structure.
[R1] DOI:https://doi.org/10.1103/PhysRevApplied.14.014027
[R2] DOI: 10.1109/TAP.2017.2702712
Author Response
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Reviewer 3 Report
The title should be revised maybe the term "defect ground" should be included.
1.Introduction
-Line 52, “power dividing mechanism” should be replaced with “phase shifter circuit”
-The novelty of the proposed work should be clarified. What is the novelty of the proposed work?
2.Asymmetric patch unit cell element
-Why the proposed work used only single side (L2) of asymmetric patch, why not two side (L1 and L2) of asymmetric patch? What is the advantage of the asymmetric patch over square patch?
-Why the proposed work used the ground circular ring slot? Literature about the ground circular ring slot should be given.
-Fig.1, terminology for defining the asymmetrical path dimension must be revised. L1 and W are OK, but to avoid confusing used only L2 or θ.
-line 115 to 116, the simulation method must explain in this paper.
-What is the ground plan conditions of the simulation results shown in Figure 3.
-All control parameters should be reported for Fig.1,2, 3 and Table 1.
-Line 140, What is the diameter of ground ring slot mentioned in Table 1.
-line 146 to 149 “The variable radius (r) of this grounded embedded ring slot has been used to progressively vary the reflection phase response of the asymmetric patch element. The width of this ground ring slot should be kept as minimum as possible in order to suppress the generation of the back radiations.” Citation should be given.
-Specification/part number of waveguide simulator should be given. How the unit cell placing/mounting on the waveguide simulation should be described. Is any variation from the placing/mounting of the unit cell effect to the measurement? How the proposed work calibrates the measurement system?
-line 198, what are those two resonant frequencies appear at which frequencies? The mathematical model or electrical model should be given for calculate those two resonant frequencies.
-Cause of the shift of resonant frequencies shift should be discussed in Fig.6(a) and (b).
-In Fig.2, Fig. 6 and Fig.7, were the proposed work plotted the Magnitude and Phase of S11 that measured by the VNA? If yes, please used Magnitude of S11 and Phase of S11 in Fig.6 and 7.
-Fig.7(a), what is the meaning of length on x-axis? L2? How about the θ?
-All control parameters should be reported for Fig.6, 7.
3.Reflectaarray of asymmetric patch elements
-The resolution of Fig.8(c) is very poor, cannot see the horn antenna and distance between horn and the reflectarray paths.
-All dimensions (distance between patch, ring slot etc.) of the proposed antenna shown in Fig.8 must be reported.
-From Fig.10, it is not clear that the performance of the proposed antenna is relied on the asymmetric patch rather than the ring slot. Did the proposed work compare to the square patch with ring slot? If not, perhaps the square patch with ring slot should be reported.
4.Receive signal strength measurement
-Specification/Part number of horn antenna/generator/receiver should be clarified.
-Fig.12 the distance between antenna and ceiling should be given. Was any reflection signal from the ceiling?
5.Comparison and conclusion
- Line, 344 to 346, it is not clear that the performance of the asymmetric patch better than square patch [30]. Did the work in [30] used the defect ground (like ring slot) or just square patch alone? Please discuss more about the influent of ground ring slot to the performance of the proposed antenna compare to the tilt angle of asymmetric patch and square patch with/without ground ring slot.
- Comparison and conclusion can be improved, it should reflect the hypothesis/proposed in the introduction.
Author Response
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Round 2
Reviewer 2 Report
The authors' responses to my comments are not persuasive and the novelty of the designed structure is low. In addition, the literature review is weak.
Author Response
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Reviewer 3 Report
Thank you for the answers.
Author Response
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Round 3
Reviewer 2 Report
The authors have modified the paper appropriately. I have no further comments.