4.Antenna & Transmission Lines

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ทฤษฎี และแนวทางตามมาทีหลังครับ

นำหลักการต้นแบบ การออกแบบสายอากาศยากิ ของ NBS TECHNICAL NOTE 688

มาใช้ก่อน หาไม่ได้แล้วจริงๆ ตัวนี้ แต่ว่าผมบังเอิญ ได้มาครับ V 

http://www.emaxit.asia/download/451.pdf

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เห็นเพื่อนๆ เหงาก็เลยหาอะไรมาให้ทำเล่น แล้วก็นำไปติดที่ทำงานได้ด้วย

อย่างนี้เขาเรียกว่า งานอดิเรก ได้หรือเปล่าครับเนี้ย V 

http://www.emaxit.asia/download/antenna_transsmion_lines.pdf

ใครทำแบบใหนได้ช่วยมาโชว์ แล้วบอกต่อด้วยนะครับ V

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0 dBd =  2.15 dBi    (i = Isotopic=Antenna ที่มีลักษณะการแพร่คลื่นรูปโดนัท หรือเสมือนวงกลม ใช้สมการ Maxwell's equations

>>>http://en.wikipedia.org/wiki/Maxwell's_equations

>>>http://en.wikipedia.org/wiki/Isotropic_radiator)


VK5DJ's YAGI
Emax.IT Design For Navy34.com

Yagi design frequency =800.00 MHz
Wavelength =375 mm
Elements contacting a metal boom 8.00 mm in diam.
Director/reflector diam =2.00 mm
Radiator diam =2.00 mm

ELEMENT LENGTHS AND SPACING
Reflector
186 mm long at boom position = 30 mm

Radiator
Single dipole 176 mm tip to tip at boom posn =105 mm
Folded dipole 180 mm tip to tip at boom posn =105 mm

Dir   Length   Spaced   Boom position   Gain   Gain
(no.)   ( mm )   ( mm )   ( mm )      (dBd)   (dBi)
1   167   28   133      5.6   7.8
2   165   67   201      7.0   9.2
3   164   81   281      8.2   10.3
4   162   94   375      9.2   11.3
5   161   105   480      10.0   12.1
6   159   112   592      10.7   12.9
7   158   118   710      11.3   13.5
8   157   124   834      11.9   14.0
9   156   129   963      12.3   14.5
10   155   135   1098      12.8   14.9
11   154   141   1239      13.2   15.4
12   153   144   1383      13.6   15.7
13   153   146   1529      13.9   16.1

Director spacings are measured from the previous element
Tolerance for element lengths is +/- 1 mm

Boom position is the mounting point for each element as measured
from the rear of the boom and includes the 30 mm overhang.The total boom length is 1559 mm including two overhangs

The beam's estimated 3dB beamwidth is 32 deg

A half wave 4:1 balun uses 0.70 velocity factor RG-142 (PTFE)  and is 131 mm long plus leads

Here are some construction details for a folded dipole

Measurements are taken from the inside of bends
Folded dipole length measured tip to tip = 180mm
Total rod length =242mm
Centre of rod=121mm
Distance HI=GF=29mm
Distance HA=GE=30mm
Distance HB=GD=32mm
Distance HC=GC=121mm
Gap at HG=120mm
Bend diameter BI=DF=2mm

If the dipole is considered as a flat plane (see ARRL Antenna Handbook) then its resonant frequency is 806.7MHz and K is 0.968

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900 MHz

VK5DJ's YAGI
Emax.IT Design For Navy34.com

Yagi design frequency =900.00 MHz
Wavelength =333 mm
Elements contacting a metal boom 8.00 mm in diam.
Director/reflector diam =2.00 mm
Radiator diam =2.00 mm

ELEMENT LENGTHS AND SPACING
Reflector
166 mm long at boom position = 30 mm

Radiator
Single dipole 156 mm tip to tip at boom posn =97 mm
Folded dipole 160 mm tip to tip at boom posn =97 mm

Dir   Length   Spaced   Boom position   Gain   Gain
(no.)   ( mm )   ( mm )   ( mm )      (dBd)   (dBi)
1   148   25   122      5.7   7.9
2   147   60   182      7.1   9.2
3   145   72   253      8.2   10.4
4   144   83   336      9.2   11.3
5   143   93   430      10.0   12.2
6   141   100   530      10.7   12.9
7   140   105   635      11.3   13.5
8   139   110   745      11.9   14.0
9   138   115   859      12.4   14.5
10   137   120   979      12.8   15.0
11   137   125   1104      13.2   15.4
12   136   128   1232      13.6   15.7
13   135   130   1362      13.9   16.1

Director spacings are measured from the previous element
Tolerance for element lengths is +/- 1 mm

Boom position is the mounting point for each element as measured
from the rear of the boom and includes the 30 mm overhang.The total boom length is 1392 mm including two overhangs

The beam's estimated 3dB beamwidth is 32 deg

A half wave 4:1 balun uses 0.70 velocity factor RG-142 (PTFE)  and is 117 mm long plus leads

Here are some construction details for a folded dipole

Measurements are taken from the inside of bends
Folded dipole length measured tip to tip = 160mm
Total rod length =311mm
Centre of rod=156mm
Distance HI=GF=74mm
Distance HA=GE=75mm
Distance HB=GD=77mm
Distance HC=GC=156mm
Gap at HG=10mm
Bend diameter BI=DF=2mm

If the dipole is considered as a flat plane (see ARRL Antenna Handbook) then its resonant frequency is 907.8MHz and K is 0.966

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1.8 GHz

<a href="http://www.youtube.com/v/08wwQ2oVWfY&amp;amp;hl=en_US&amp;amp;fs=1?color1=0x006699&amp;amp;color2=0x54abd6" target="_blank">http://www.youtube.com/v/08wwQ2oVWfY&amp;amp;hl=en_US&amp;amp;fs=1?color1=0x006699&amp;amp;color2=0x54abd6</a>

<a href="http://www.youtube.com/v/rufh6O_LE5M&amp;amp;hl=en_US&amp;amp;fs=1?color1=0x234900&amp;amp;color2=0x4e9e00" target="_blank">http://www.youtube.com/v/rufh6O_LE5M&amp;amp;hl=en_US&amp;amp;fs=1?color1=0x234900&amp;amp;color2=0x4e9e00</a>

<a href="http://www.youtube.com/v/US8cgUq_XBY&amp;amp;hl=en_US&amp;amp;fs=1?color1=0x5d1719&amp;amp;color2=0xcd311b" target="_blank">http://www.youtube.com/v/US8cgUq_XBY&amp;amp;hl=en_US&amp;amp;fs=1?color1=0x5d1719&amp;amp;color2=0xcd311b</a>

<a href="http://www.youtube.com/v/uI5KNnBw1pc&amp;amp;hl=en_US&amp;amp;fs=1?color1=0x5d1719&amp;amp;color2=0xcd311b" target="_blank">http://www.youtube.com/v/uI5KNnBw1pc&amp;amp;hl=en_US&amp;amp;fs=1?color1=0x5d1719&amp;amp;color2=0xcd311b</a>

VK5DJ's YAGI
Emax.IT Design For Navy34.com

Yagi design frequency =1800.00 MHz
Wavelength =167 mm
Elements contacting a metal boom 8.00 mm in diam.
Director/reflector diam =2.00 mm
Radiator diam =2.00 mm

ELEMENT LENGTHS AND SPACING
Reflector
86 mm long at boom position = 30 mm

Radiator
Single dipole 77 mm tip to tip at boom posn =63 mm
Folded dipole 79 mm tip to tip at boom posn =63 mm

Dir   Length   Spaced   Boom position   Gain   Gain
(no.)   ( mm )   ( mm )   ( mm )      (dBd)   (dBi)
1   75   12   76      6.5   8.6
2   74   30   106      7.6   9.8
3   74   36   142      8.6   10.7
4   73   42   183      9.5   11.6
5   72   47   230      10.2   12.4
6   71   50   280      10.9   13.1
7   71   52   332      11.5   13.6
8   70   55   387      12.0   14.2
9   70   57   445      12.5   14.6
10   69   60   505      12.9   15.1
11   69   62   567      13.3   15.5
12   68   64   631      13.7   15.8
13   68   65   696      14.0   16.1

Director spacings are measured from the previous element
Tolerance for element lengths is +/- 0 mm

Boom position is the mounting point for each element as measured
from the rear of the boom and includes the 30 mm overhang.The total boom length is 726 mm including two overhangs

The beam's estimated 3dB beamwidth is 32 deg

A half wave 4:1 balun uses 0.70 velocity factor RG-142A (PTFE)  and is 58 mm long plus leads

Here are some construction details for a folded dipole

Measurements are taken from the inside of bends
Folded dipole length measured tip to tip = 79mm
Total rod length =150mm
Centre of rod=75mm
Distance HI=GF=33mm
Distance HA=GE=35mm
Distance HB=GD=37mm
Distance HC=GC=75mm
Gap at HG=10mm
Bend diameter BI=DF=2mm

If the dipole is considered as a flat plane (see ARRL Antenna Handbook) then its resonant frequency is 1811.5MHz and K is 0.953

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<a href="http://www.youtube.com/v/RRT4gzs2Obc&amp;hl=en_US&amp;fs=1&amp;color1=0x2b405b&amp;color2=0x6b8ab6" target="_blank">http://www.youtube.com/v/RRT4gzs2Obc&amp;hl=en_US&amp;fs=1&amp;color1=0x2b405b&amp;color2=0x6b8ab6</a>

 

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2100 MHz

VK5DJ's YAGI
Emax.IT Design For Navy34.com

Yagi design frequency =2100.00 MHz
Wavelength =143 mm
Elements contacting a metal boom 8.00 mm in diam.
Director/reflector diam =2.00 mm
Radiator diam =2.00 mm

ELEMENT LENGTHS AND SPACING
Reflector
74 mm long at boom position = 30 mm

Radiator
Single dipole 66 mm tip to tip at boom posn =59 mm
Folded dipole 67 mm tip to tip at boom posn =59 mm

Dir   Length   Spaced   Boom position   Gain   Gain
(no.)   ( mm )   ( mm )   ( mm )      (dBd)   (dBi)
1   65   11   69      6.7   8.8
2   64   26   95      7.8   9.9
3   63   31   126      8.7   10.9
4   63   36   161      9.6   11.7
5   62   40   201      10.3   12.5
6   61   43   244      11.0   13.1
7   61   45   289      11.5   13.7
8   60   47   336      12.1   14.2
9   60   49   385      12.5   14.7
10   59   51   437      12.9   15.1
11   59   54   490      13.3   15.5
12   59   55   545      13.7   15.8
13   58   56   601      14.0   16.2

Director spacings are measured from the previous element
Tolerance for element lengths is +/- 0 mm

Boom position is the mounting point for each element as measured
from the rear of the boom and includes the 30 mm overhang.The total boom length is 631 mm including two overhangs

The beam's estimated 3dB beamwidth is 32 deg

A half wave 4:1 balun uses 0.70 velocity factor RG-142 (PTFE)  and is 50 mm long plus leads

Here are some construction details for a folded dipole

Measurements are taken from the inside of bends
Folded dipole length measured tip to tip = 67mm
Total rod length =127mm
Centre of rod=63mm
Distance HI=GF=28mm
Distance HA=GE=29mm
Distance HB=GD=31mm
Distance HC=GC=63mm
Gap at HG=10mm
Bend diameter BI=DF=2mm

If the dipole is considered as a flat plane (see ARRL Antenna Handbook) then its resonant frequency is 2116.9MHz and K is 0.951

[somsak]

2300 MHz

VK5DJ's YAGI
Emax.IT Design For Navy34.com

Yagi design frequency =2300.00 MHz
Wavelength =130 mm
Elements contacting a metal boom 8.00 mm in diam.
Director/reflector diam =2.00 mm
Radiator diam =2.00 mm

ELEMENT LENGTHS AND SPACING
Reflector
68 mm long at boom position = 30 mm

Radiator
Single dipole 60 mm tip to tip at boom posn =56 mm
Folded dipole 61 mm tip to tip at boom posn =56 mm

Dir   Length   Spaced   Boom position   Gain   Gain
(no.)   ( mm )   ( mm )   ( mm )      (dBd)   (dBi)
1   59   10   66      6.8   9.0
2   59   23   89      7.9   10.0
3   58   28   117      8.8   10.9
4   57   33   150      9.6   11.8
5   57   36   186      10.4   12.5
6   56   39   226      11.0   13.2
7   56   41   267      11.6   13.7
8   55   43   310      12.1   14.2
9   55   45   355      12.5   14.7
10   54   47   401      13.0   15.1
11   54   49   450      13.4   15.5
12   54   50   501      13.7   15.9
13   53   51   551      14.0   16.2

Director spacings are measured from the previous element
Tolerance for element lengths is +/- 0 mm

Boom position is the mounting point for each element as measured
from the rear of the boom and includes the 30 mm overhang.The total boom length is 581 mm including two overhangs

The beam's estimated 3dB beamwidth is 32 deg

A half wave 4:1 balun uses 0.70 velocity factor RG-142 (PTFE)  and is 46 mm long plus leads

Here are some construction details for a folded dipole

Measurements are taken from the inside of bends
Folded dipole length measured tip to tip = 61mm
Total rod length =115mm
Centre of rod=57mm
Distance HI=GF=25mm
Distance HA=GE=26mm
Distance HB=GD=28mm
Distance HC=GC=57mm
Gap at HG=10mm
Bend diameter BI=DF=2mm

If the dipole is considered as a flat plane (see ARRL Antenna Handbook) then its resonant frequency is 2321.1MHz and K is 0.950

[somsak]

2400 MHz  (WiFi)

VK5DJ's YAGI
Emax.IT Design For Navy34.com


Yagi design frequency =2400.00 MHz
Wavelength =125 mm
Elements contacting a metal boom 8.00 mm in diam.
Director/reflector diam =2.00 mm
Radiator diam =2.00 mm

ELEMENT LENGTHS AND SPACING
Reflector
66 mm long at boom position = 30 mm

Radiator
Single dipole 58 mm tip to tip at boom posn =55 mm
Folded dipole 59 mm tip to tip at boom posn =55 mm

Dir   Length   Spaced   Boom position   Gain   Gain
(no.)   ( mm )   ( mm )   ( mm )      (dBd)   (dBi)
1   57   9   64      6.9   9.1
2   56   22   87      7.9   10.1
3   56   27   114      8.8   11.0
4   55   31   145      9.7   11.8
5   54   35   180      10.4   12.5
6   54   37   217      11.0   13.2
7   53   39   257      11.6   13.7
8   53   41   298      12.1   14.2
9   53   43   341      12.6   14.7
10   52   45   386      13.0   15.1
11   52   47   433      13.4   15.5
12   51   48   481      13.7   15.9
13   51   49   530      14.0   16.2

Director spacings are measured from the previous element
Tolerance for element lengths is +/- 0 mm

Boom position is the mounting point for each element as measured
from the rear of the boom and includes the 30 mm overhang.The total boom length is 560 mm including two overhangs

The beam's estimated 3dB beamwidth is 31 deg

A half wave 4:1 balun uses 0.70 velocity factor RG-142 (PTFE)  and is 44 mm long plus leads

Here are some construction details for a folded dipole

Measurements are taken from the inside of bends
Folded dipole length measured tip to tip = 59mm
Total rod length =110mm
Centre of rod=55mm
Distance HI=GF=23mm
Distance HA=GE=25mm
Distance HB=GD=27mm
Distance HC=GC=55mm
Gap at HG=10mm
Bend diameter BI=DF=2mm

If the dipole is considered as a flat plane (see ARRL Antenna Handbook) then its resonant frequency is 2426.4MHz and K is 0.951

[somsak]

สำหรับเพื่อนๆ ที่มีพื้นฐานการออกแบบสายอากาศ วันนี้เรามาต่อยอดงานไปพร้อมๆ กันดีกว่าครับ

ของผมจะนำออกสู้ท้องตลาด ก.ค.53 นี้ คงเสร็จทันมั๋ง ครับ


http://www.nic.funet.fi/pub/ham/antenna/

แนะนำ download เก็บไว้เพราะว่าหายากครับ ถ้าเว็บเขาปิดเราก็จะหมดโอกาสที่จะหาอะไรดีๆ มาพัฒนางานนะครับ

อีกนิดหนึ่งครับถ้า เอกสารตัวใหนอ้างที่มาของสายอากาศของ NBS เพื่อนๆ ก็กางเอกสารด้านบนมาดูแล้วก็เรียนรู้

ถ้าไม่เข้าใจก็ post ข้อความไว้แล้วผมจะมาช่วยตอบหรือท่านอาจารย์ท่านอื่นๆ ที่ได้แวะเข้ามานะครับ

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