Design of Parameter-Optimized Spiral Arrays with Ultra-Wideband Grating Lobe Suppression

Round 1

Reviewer 1 Report

The paper presents a methodology for optimizing the layout of spiral arrays, in order to suppress grating lobes.

The proposed particle swarm optimization can identify a set of optimal parameters that outperform classical methods.

The paper clearly describes the methodology and the results, and it appears to be free from basic errors. 

As minor comment: The authors give information on the computer they use but say nothing about the operating system, the programs used, libraries, and the execution times. They could add some practical information and/or interesting details.

They missed an opportunity to provide practical insights or interesting details.

Author Response

We provide a point-to-point response to your comments.Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Authors have reported “Design of Parameter-optimized Spiral Arrays with Ultra-wideband Grating Lobe Suppression”

 

Q1.The details of algorithm needs to be more elaborative.

Q2. What is the significance of Equation 1

Q3. The steps shown in Algorithm 1 need to be more specific

 Major Revision is suggested.

Author Response

 We provide a point-by-point response to your comments. Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 3 Report

Dear Authors

I have the following comments and one question:

1. In your algorithm, when calculating the AF, you assume that all currents exciting the radiators are in phase. In fact, for a real antenna array, the impedance couplings between the radiators cause these currents to be unequal. Of course, the task of aligning the current phases can be done on the feeding network side, but as you know, it can be quite troublesome. One can do otherwise. Assuming the we know the couplings between the radiators, we can create the impedance matrix that describes all these relationships. And now the question. How complicated would your algorithm be if you took into account the mutual coupling of the radiators when determining the geometry of antenna array ?

 

2. In the text in Fig. 1 there is the parameter PSLL (Peak Sidelobe level). The text on line 110 mentions PSL. Further down there is PSLL again (line 193). I suggest leaving one abreviation. However, if PSLL and PSL are different parameters please explain them clearly. 

 

3. I suggest to add the figure depicted  PSL vs freq  for the second example. As it was done in Fig. 1 for the first example.

 

4. In the text, the PSL for the Penros array at fmax is -10.35dB. (line 181). Figure 5 shows that for penrose array, the PSL is about -12 dB. Where does this little difference come from? Maybe it's a dashed line problem. Please check it.

Author Response

We provide a point-by-point response to your comments. Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

The authors have incorporated all the necessary changes and I recommend fpr publication in current state.