Review Reports

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The authors proposed a dual-band bandpass filter using folded multi-mode resonators and second-mode suppression. Some issues are shown as follows. 

1. Why the SIW design utilized at 3.6 GHz and 5.8 GHz? Any advantage compared with microstrip dual-band filter considering the complicate structure and the structure for second-mode suppression. Please clear this point in the revised manuscript. 

2. What happened for the different simulated insertion loss for the results in Figs. 13 and 15?

3. There are coupling window and coupling trace between the two resonators. So, the function for the two coupling structure should be clear. 

4. Could the author provide some analysis for the bandwidth, coupling coefficient and feeding effect?

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

The paper is well organized, but i have a few suggestions to improve the quality of the work.

1- English language is difficult to understand. Please read and correct difficult phrases in the whole draft to help the reader understand.

2- In the comparison table, i see the references only for 2018; please cite and add the latest comparisons from good journals.

3- Please add a fabricated photograph of the filter and VNA.

4- Some abbreviations are still missing. Read the paper carefully.

5- It will be good to replace the Ref with some of the of the latest papers of year 2024 (below) in the comparison table and in the introduction section as well, because 63 Refs are too many.

(a)Design and modelling of a compact triband passband filter for GPS, WiMAX, and Satellite applications with multiple transmission zeros

(b)Multi Frequency Controllable In-Band Suppressions in a Broad Bandwidth Microstrip Filter Design for 5G Wi-Fi and Satellite Communication Systems Utilizing a Quad-Mode Stub-Loaded Resonator

(c)Design and Analysis of a Compact GSM/GPS Dual-band Bandpass Filter using T-shaped Resonator. Compare your results in terms of FBW and TZs with the above papers.

6- Mathematical equations are missing. Prove your methodology by some equations to increase the quality of your work. I suggest getting help from above papers.

7- What is meant by term hybrid in the title?

8- Applications of the frequency bands?

Comments on the Quality of English Language

Minor editing

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 3 Report

Comments and Suggestions for Authors

The manuscript entitled, "Compact and Hybrid Dual-Band Bandpass Filter Using Folded Multi-Mode Resonators and Second-Mode Suppression" is reviewed and some suggestions and comments are given below:

1) You have fabricated a dual bandpass filter for IoT applications. However, many devices are used for the IoT system and you haven't mentioned them a particular devices. You also need to mention the frequencies used in those devices which should be matched with your design. 

Therefore, my suggestion is that you can select the devices and their specifications used in the IoT system and then match them up with your proposed design. It would be helpful for better clarity and applicability.

2) The congruence between simulation and measurement data is noted, indicating promising results.

3) In your electromagnetic simulation, please mention the current distribution condition (as you mentioned in Figure 2) at each frequency (in your case, at points A, B, C, and D in Figure 12.) 

 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Comments and Suggestions for Authors

The authors have answered the questions and revised accordingly. 

Reviewer 2 Report

Comments and Suggestions for Authors

Well the authors incorporated all comments, therefore it is OK from my side. Congratulations