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Article
Peer-Review Record

Inverted F Type Antenna Design for the Cattle Activity and Estrus Detection Sensor Module

Appl. Sci. 2021, 11(1), 298; https://doi.org/10.3390/app11010298
by Youchung Chung
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Appl. Sci. 2021, 11(1), 298; https://doi.org/10.3390/app11010298
Submission received: 15 December 2020 / Revised: 24 December 2020 / Accepted: 26 December 2020 / Published: 30 December 2020

Round 1

Reviewer 1 Report

See attached, minor comments for clarification.

Comments for author File: Comments.pdf

Author Response

please see the attached pdf

lene# 

18: changed to compared

59-60: to clear sentence is changed to: The gyro sensor on mainboard detects the movement of livestock, and the mainboard transmits the movement data to the base station through the ZigBee RF transmission & reception module with monopole or high gain patch antenna based on the size of the ranch.

 

61  added => The ZigBee HbeePro-20C RF module

The ZigBee HbeePro-20C RF module,  for short-range like 1m

 

62  long-distance can be based on the ranch size. 

It can be extended by the higher gain of the receiving antenna.

66.-69 Since there is only position data it is not a big amount of data.   It is changed as following

The low 8kb/sec data can be analyzed and displayed by mobile or computer, and the result can be informed in advance to the owner. A daily or weekly data collected continuously and analysis of the data makes it possible to predict the future and various outcomes such as health status, breeding period, and activity status of cattle.

 

78 I added Figure without the chip antenna. I will clear the uncertainty.

 

80 unit is in mm  PDF transform prob. It is OK with my PDF

81  changed to   Figure 2. RF module, location of antenna, size of feeding point of inverted F antenna

 

82  Yes, that’s why I add figure 3.  L and H are general parameters and frequency dependent. The explanation is in Line 89~90

90  PDF transform prob. In MDPI  l is OK with my PDF

  1. since IFA is in the air so length in mm.

99  Fig4 is changed to clear the shape of the antenna. I added an explanation about Fig3 and Fig4 near line 94 as follows:  L in Figure 2 equals L1+L2 in Figs 4 and 5.

   L1 and L2 are added to Fig 4

107-108  The antenna location was displayed on the coverside.

The Antenna shape on the cover is deleted to make it clear in Fig 4.

112 gab => gap

  1. W-> w

118  length of L2 varies  LY I deleted to match with Fig 6.

119-120  changed as bellow.

The optimum of L2 is 8mm when L1=20mm and h=5.5mm. The optimized total length of the proposed IFA antenna L1+L2+h is about 33.5mm, which is about 3mm longer than the theoretical length of IFA antenna about 31mm, which is l/4 of ZigBee frequency of 2.45GHz. 

122  PDF transform prob. In MDPI  l is OK with my PDF

123 Fig 5  changed to gap

128  add an explanation of board on line# 113 on FR4 board

and of polypropylene cover on 104

 

131-132  Figure6  Legend changed to L2

   Matched to Return loss

134  label of x-axis is changed matched to the text

 

137 Fig 8 (b) is changed. The scale is shown at the bottom.  The reason why the measurement window is shown is to show the actual measurements. If you want to change/merge to figure 7, it can be done at the final version

  

151  X, Y, Z axes are added to Fig 5.

153

Fig.9 is changed as (antenna is added in the pattern) Scale is auto I cannot change.

I added on line 142: and radiation patterns of x-z and x-z planes are shown in Fig. 9(b) and (c) with antenna structure.  

Reviewer 2 Report

It is advisable to consider the impact of the lossy material with high permittivity on the antenna radiation properties (return loss, resonant frequency and gain …) when the wireless equipment is mounted close to that material?

15    A space should be inserted between the numerical value and its corresponding unit of measurement, throughout the text (for example 2.45GHz --> 2.45 GHz; 1.6dB --> 1.6 dB

17, 184, 194    …20dBm…--> …20 dB… (dB is a relative unit of measure)

89      …position, and It does not require… (“It” should be replaced with “it”)

90      Note that symbol “lambda” (λ) is not correctly reproduced.

112 and 115    What do you mean with the word (variable) “gab”? Do you mean “gap”?

122    Note that symbol “lambda” (λ) is not correctly reproduced.

151-152   What is the meaning of the coordinate system in Fig. 9 (a) on the right? Can you connect it with the coordinate system in Fig (a) on the left?

177   Could you clarify the caption:  …Fabricated & measurement of |S11…?

199    In REF 1, the author’s name is erroneously given as “Baanis “ --> “Balanis”

 

The list of references on the antenna design is not adequate.

Author Response

It is advisable to consider the impact of the lossy material with high permittivity on the antenna radiation properties (return loss, resonant frequency, and gain …) when the wireless equipment is mounted close to that material?

=> CST simulation has been done including the board and material near the antenna. The resonant frequency with and without cover has been analyzed.In  Line #113, information of material (FR4) is added, and in line #105, the information of polypropylene cover is added.

 15   A space should be inserted between the numerical value and its corresponding unit of measurement, throughout the text (for example 2.45GHz --> 2.45 GHz; 1.6dB --> 1.6 dB

Corrected

  • -16 dB and the gain of 1.6 dB at 2.45 GHz.
  • All other units in the article are corrected.

17, 184, 194    …20dBm…--> …20 dB… (dB is a relative unit of measure)

Corrected

  1. 17 There is about 20dB enhancement
  2. 184 There is 20 dB enhancement with the proposed IFA antenna.
  3. 194 20 dB RSI can be enhanced
  4.  

…position, and It does not require… (“It” should be replaced with “it”)

  1. Changed as following:
  2. position, and it does not require any

 

  • Note that symbol “lambda” (λ) is not correctly reproduced.
  • MDPI publishing company made mistake in PDF transform prob. l is OK with my PDF

112 and 115    What do you mean with the word (variable) “gab”? Do you mean “gap”?

  • Changed as following:
  • 20< L1<25 mm, L2< 30 mm, 3<h< 5.5 mm, w=3 mm, the gap, between feeding and ground, is about 2~4.4 mm on FR4 board. The width of the antenna w is not as sensitive as other parameters. The optimization of each parameter value to match the antenna to the frequency of the ZigBee 45 GHz, and the parameters are adjusted within the limitations of all parameters. The simulated and optimized parameters of the antenna are: L1 = 20, L2=5, height h=5.5 mm, and gab=4 mm.
  • Figure 5 is changed gab =>  gap

 

122    Note that symbol “lambda” (λ) is not correctly reproduced.

  • MDPI publishing company made mistake in PDF transform prob. l is OK with my PDF

 

151-152   What is the meaning of the coordinate system in Fig. 9 (a) on the right? Can you connect it with the coordinate system in Fig (a) on the left?

  • 9s are changed with X, Y, Z coordinate, and the antenna is added in 9(b) and (c) patterns. I added on line 142: and radiation patterns of x-z and x-z planes are shown in Fig. 9(b) and (c) with antenna structure.  

177   Could you clarify the caption:  …Fabricated & measurement of |S11…?

  • Captions of Figure 7, 8 are changed to S11 [dB]

199    In REF 1, the author’s name is erroneously given as “Baanis “ --> “Balanis”

  • Changed

The list of references on the antenna design is not adequate.

  • 11 and 6 are added and MDPI may require MDPI journals in the reference. The other reviewer likes Figure 3, I added ref. 11. All Ref numbers are corrected.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

The author thoroughly revised his manuscript in accordance to the reviewer’s comments and concerns. The proposed design still suffers from a lack of novelty.

The revised version of the manuscript is acceptable for publishing in Applied Sciences.

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