Collinear antenna array

[Admin 2540]

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.

 

[Admin 2540]

[bejonet 58]

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

 

[bejonet 58]

and this, gain 10db

[Admin 2540]

I think this would be more valid

 

,,,or this,,,

[Admin 2540]

that does not have 10dBi,,,!!!

[bejonet 58]

what dimension of this antenna

On 10/11/2017 at 0:05 PM, Admin said:

I think this would be more valid

 

 

if i add more element can be add more gain?

 

[bejonet 58]

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

[bejonet 58]

[Admin 2540]

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

 

 

,,, rubber duck inside...

[bejonet 58]

this

[Admin 2540]

I think this should be ...!!!

 

 

[bejonet 58]

like this ?

[Admin 2540]

look more closely at my image above,,,!!!!

[bejonet 58]

ok, i will try it, thank you

[bejonet 58]

i was change connector

 

and try to compare with this antenna

 

and the result

this is my antenna

 

and this is rubber duck

 

my bad

 

[Admin 2540]

meaning..??

[bejonet 58]

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

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

[Admin 2540]

this is not possible ... !!!

it's a mistake...!!!

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

[bejonet 58]

great it is working, more closer with 5dbi antenna

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

[Admin 2540]

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 ,,, !!!

[Admin 2540]

", you can try a simpler construction

[bejonet 58]

i was..but still better than i have made now

[Admin 2540]

[Admin 2540]

"or you may want this ...