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Collinear antenna array

35 posts in this topic

In telecommunications, a collinear antenna array is an array of dipole antennas mounted in such a manner that the corresponding elements of each antenna are parallel and collinear, that is they are located along a common line or axis.

Collinear arrays of dipoles are high gain omnidirectional antennas. A dipole has an omnidirectional radiation pattern when in free space and not influenced by any other conductors in that it radiates equal radio power in all azimuthal directions perpendicular to the antenna, with the signal strength dropping to zero on the antenna axis. The purpose of stacking multiple dipoles in a vertical collinear array is to increase the power radiated in horizontal directions and reduce the power radiated into the sky or down toward the earth, where it is wasted. They radiate vertically polarized radio waves. Theoretically, when stacking idealised lossless dipole antennas in such a fashion, doubling their number will produce double the gain, with an increase of 3.01 dB. In practice, the gain realized will be below this due to imperfect radiation spread and losses.

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can you try to simulation for this antenna, frequency 2442 MHz. thanks :) 

 

tplink.jpg

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I think this would be more valid

65.jpg

 

,,,or this,,,

IMG_2487.jpg

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This is a simple and good omnidirectional antenna

CIMG2907.jpg CIMG2908.jpg CIMG2909.jpg

CIMG2910.jpg CIMG2911.jpg CIMG2912.jpg

CIMG2913.jpg CIMG2914.jpg screenshot_3056.jpg

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what dimension of this antenna

2 hours ago, Admin said:

I think this would be more valid

65.jpg

 

 

if i add more element can be add more gain?

2 hours ago, Admin said:

This is a simple and good omnidirectional antenna

CIMG2907.jpg CIMG2908.jpg CIMG2909.jpg

CIMG2910.jpg CIMG2911.jpg CIMG2912.jpg

CIMG2913.jpg CIMG2914.jpg screenshot_3056.jpg

 

 

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i make this simple omnidirectional antenna, connector i take from rubber duck antenna, it is 60cm long

IMG20171021144401.jpg

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,,,buddy,how you made the connection here,,,???

 

 

CIMG2913.jpg

,,, rubber duck inside...

ducky_inside.jpg

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i was change connector

IMG20171021233356.jpg

 

and try to compare with this antenna

IMG20171021233623.jpg

 

and the result

this is my antenna

Screenshot_2017-10-21-23-38-50.png

 

and this is rubber duck

Screenshot_2017-10-21-23-32-05.png

 

my bad :/

 

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5dbi rubber duck much better than my antenna, hehe... :D

i test those antenna with tplink TL-841ND as repeater to connect to the main access point,

and why my antenna gain cannot same with 5dbi rubber duck.

i hope you can understand what i say :)

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this is not possible ... !!!

it's a mistake...!!!

,,,,or "play" with this diameter...!!!

CIMG2907.jpg

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great it is working, more closer with 5dbi antenna

which must i tunning again, if  add more longer, can that add more gain?

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1 hour ago, bejonet said:

great it is working, more closer with 5dbi antenna

which must i tunning again, if  add more longer, can that add more gain?

"well, but this antenna must have at least 7 dBi gain directivity ,,, !!!

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