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Collinear antenna array

44 posts in this topic

hello brother how are you, long time to see

i would try to make like this, what do you thinking

antena.png

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Another good collinear antenna with a 9 dBi directivity gain...
 

9dbi_01.jpg

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Proposed dipole array antenna which makes omnidirectional  radiation possible and is made of coaxial cable with metal cylinders...

 

colinear_01.jpg

colinear_02.jpg

colinear_03.jpg

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colinear_05.jpg

colinear_06.jpg

colinear_07.jpg

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what is the formula for calculating rubber duck antenna

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HALF Wavelength with stub balun 1:1 (reduced in length due to dielectric effect )

so it will end up being two sections of about 30 mm IMHO

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https://www.allaboutcircuits.com/uploads/articles/2.4GHz_Wi-Fi_Antenna_.5_Wavelength_Dipole.png

In the sleeve dipole the top element is normally  simple the coax center conductor extended. This is also normally left with its insulation intact, which means its length must be compensated for by the insulation's permittivity. (the antenna is SHORTER than an a free dipole ; wich is (speed of light/frecuency ) / 2 )

coxial.jpg

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Maksud saya apakah ada formula untuk membuat antena ini ,

formula for impedance adjustment to 50 ohms or 75 ohms

Edited by Ingsun

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,,, construction of a simple collinear antenna...

 

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,,, and yet no, this omni antenna is not well sized...

screenshot_2357.jpg

,,, it is for 2.63 Ghz

and this is the reality after resizing...

screenshot_2358.jpg

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On 1/2/2017 at 2:23 PM, Admin said:

 

65.jpg

67.jpg

 

coil_jig.jpg

coil_measurements.jpg

 

complete_top_down.jpg

 

Full_assy_measurments.jpg

What should the dimensions be for 868mhz?

complete_at_angle.jpg

da_playas.jpg

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On 10/22/2017 at 4:04 PM, Admin said:

", you can try a simpler construction

1429_5.JPG

1429_6.jpg

 

What should the dimensions be for 868mhz?

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Please show us the connection or soldering inside those tubes.

Which wire solder to where and how to solder it.

Thank you.

CIMG2900.JPG.7e196f0ed6b50c0ff69389880e962568.jpeg

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,,,where did you get this picture from?

,,,but I think this is it...!!!

antena.thumb.png.87119db9d7b431fbb595317b923478ae.png

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