yagi 2.4Ghz yagi

[Admin 2545]

,,, a new version of the patch-yagi antenna...

[Admin 2545]

,,,a good solution by choosing a bowl as a reflector...

 

,,,okay,this is my draft,,,!!!

[GoD 0]

I started to build one of that kind antennae and I was worried about tunning. I mean as you may see in my photos I was unsure about the distance between elements because of the thickness. I know they are so thick, but I am newbie. Any pieces of advices will be welcome to me!

[Admin 2545]

thickness of material > 2 mm ...why ??

should be 0.5-1mm

[Admin 2545]

This antenna can also be made with a rectangular patches...

And simulation of CST...

New folder (5).zip

[aurel 22]

Jomy 

I am confused with all that different sizes of patch and first director

which one give best gain ?

[Admin 2545]

 This difference, increases the bandwidth and increases the distance between directors can increase the gain of the antenna.

[aurel 22]

I mean size or diameter of patch and disector.

first is  68 then i see 62 mm which one is proper?

 that is why i asking

 

[Admin 2545]

,,,where did you see this...???

[Eric 7]

2 hours ago, Admin said:

 This difference, increases the bandwidth and increases the distance between directors can increase the gain of the antenna.

which one increases the bandwidth? vibrator?

[Admin 2545]

,,,the distance between the vibrator and the first director(0,073*lambda ) as well as their different size...!!!

[Eric 7]

the farthest distance between vibrator and first director I've seen is 9-10mm..  

[aurel 22]

 i see this on a given site link by you 

there is a patch even 60,5mm and  first director 58 mm instead 54 mm

[Michal 0]

Hello,

I'm planning to build an  antenna of this type.

I have questions:

1) Is it possible to use aluminum sheet for the construction without changing the dimensions?

2) Is it possible to increase antenna gain by adding one or more directors ?  If yes, so what size and spacing ?

Thank you.

[Admin 2545]

1) yes,,, but the vibrator must to be weldable,..!!!

2) yes,,,, watch this forum carefully..!!!

[mfa56 1]

hello admin, we built one of these short version antennas by following instructions properly of Russian guy Kreosan channel on YouTube but we couldn't increase wifi signal strength, even worse, when we plug our antenna into one entrance of our adapter (Tp-link and have 2 rp-sma antennas normally) and the other 5dbi tp-link antenna remains on adapter.

Also we tried by only attaching Russian antenna on adapter (other entrance is empty) but couldn't gain anything with respect to original antennas of Tp-link. Original antennas were obtaining more signal at same place and angle. 

We also tried many positions and angles but again it sometimes increased but not steady or high mbps as much as original antennas.

 

I'm putting its photos, consider that we removed its sma connection for now, I'm mean there is no technical deficiency but it doesn't work as I said.

What are your advices, please?

Edited March 5, 2020 by mfa56
photo uploading

[Admin 2545]

,,,hi buddy...!!!

,,, your construction does not work because the adaptation between the coaxial cable and the antenna is not correct...!!!!

 

 

 

[mfa56 1]

Very very thanks,

Also we used a 8mm threaded rod instead of 4mm as shown on your design figure, does it change the dbi or result very much?

And distance between small round plates too are not same as figure bcs of rod length, we couldnt calculate it properly and cut it a bit short - 15cm -. Does it affect too much, if so we will make whole structure again..

Thanks again.

[Admin 2545]

,,, this is a simulation with 8mm rod....

The constructive dimensions...

[Admin 2545]

"""" but the best solution for this type of antenna is to increase the distance between directors....

[mfa56 1]

You're a real hero bro, thanks,

Then, is it good to make distances b/w smallest directors as shown below figure?

Also we have only 0.3mm copper plate to make directors, does it differ much not being of thicknesses as shown in figure?

Also for example, are 9mm and 7mm distances between biggest directors very important or critical?

I know your design was probably made aimed to give the best wrt other designs but I want to know too importances of those distances written on projects bcs I'm a newbie want to learn the logic behind antennas and signals.

Thanks lot bro!

[Admin 2545]

,,, yes, you can use the thickness of 0.3mm...!!!

,,,yes,9mm and 7mm distances between biggest directors very important and critical...!!!

,,, the distances between the antenna elements:7mm,9mm,41mm,36mm,36mm,36mm(these measures do not include the thickness of the material).....!!!!

[Admin 2545]

 

As a variant-shaped core of the copper wire insert in an aluminum plate. And to them already to solder.

1) drilling + braking on both sides

2) riveting

3) grinding+drilling

,,,and an antenna built from jar caps...

 

[mfa56 1]

Well,

However some Youtube videos say we must isolate the reflector, 90mm plate, (also some says we must isolate driven element, 68mm plate) from the boom or this antenna doesn't give enough gain or cannot be a real antenna or even can cause damage the ethernet card etc.

Is there any isolation process on this antennas?

However my antenna didn't work, even did everything as you said and draw but didn't work unfortunately. I'm using two original antennas of adapter again..

Thanks.

[Admin 2545]

Anyway, please, post a picture with your antenna adapter to the coaxial cable...!!!!