698-3800 Mhz Yagi

[jnkwqlqn 0]

Thoughts?

https://www.alibaba.com/product-detail/Yagi-698-3800MHz-High-Gain-12_1600089672915.html?spm=a2700.12243863.0.0.2ce83e5fe27gsj

[Admin 2545]

,,, can you give some dimensions ... ??

,,, and what the vibrator looks like inside...???

[jnkwqlqn 0]

Soon. I need to recieve the sample first.

Maybe you can create a BESTER feed out of this.

Edited November 21, 2020 by jnkwqlqn

[yeam 7]

What is the actual gain? Did you tested this out? 

[Admin 2545]

,,, for testing this type of antenna, dimensions are required...!!!

,,,it can be the same....

 

,,,, and the F-dipole looks like this ...

[yeam 7]

Is this the actual design and dimension of the F-dipole of this antenna? May I know why two different Coax (RG-638 and RG-213 Coax) is used? Is this for impedance matching purposes?

[yeam 7]

Today i had received and tested the antenna. The results is not similar as stated

[yeam 7]

[clanon 246]

I see TWO resonances...one at 750Mhz and the other at 1500Mhz... and a third (weaker)at 1900mhz or so...

[Admin 2545]

Yeam, can you post the dimensions to this antenna ... ??

[yeam 7]

I will post soon, but i think the manufacturer tested the antenna wth the 10 meter RG58 cable in roll (as shown on the photo in the first post), which means ghe manufacturer has wrong steps in testing the antenna. 

[yeam 7]

Here are the resonances frequency 

[yeam 7]

23 minutes ago, yeam said:

I will post soon, but i think the manufacturer tested the antenna wth the 10 meter RG58 cable in roll (as shown on the photo in the first post), which means the manufacturer has wrong steps in testing the antenna. 

[yeam 7]

23 hours ago, Admin said:

Yeam, can you post the dimensions to this antenna ... ??

16 hours ago, yeam said:

Here are the dimentions. Can you help me to simulate the s-parameter, radiation patern and gain? Thanks

[yeam 7]

Here are the s-paramter for the folded dipole itself only. It seem like having 4 different working frequency. So bad 2.6Ghz is missing which is a common LTE frequency

[Admin 2545]

,,, yeam,, thank you for your post,but you can give the dimensions more clearly because it is not distinguished on your images..!!!

,,, these dimensions are good(in mm) ... ???

[clanon 246]

i build a model...check it ou...(didn't like the resonances...small S11)

yagi.cst

[Admin 2545]

Clanon,,,, good job, but I don't know if you respected the F-dipole connection...!!!

[clanon 246]

you're RIGHT ...i was tweaking and fiddling with it...trying to get the  S11 right....(closer to the measurements...)

i think that the cylinder thing helps widen the band...and NOT sure about the port distance (dipole gap)

dont forget the IMPEDANCE MATCH with 125ohms quarter wave...

Edited January 18, 2021 by clanon

[Admin 2545]

,,, put some pictures, if you want ... !!

[clanon 246]

i'll try with a 300Ohms port and see ...

[clanon 246]

Edited January 18, 2021 by clanon

[Admin 2545]

[clanon 246]

i think i'm close...2.3ghz is not showing REMEMBER to use a 300 ohms port

yagi.cst

Edited January 18, 2021 by clanon

[yeam 7]

On 1/17/2021 at 11:09 PM, Admin said:

,,, yeam,, thank you for your post,but you can give the dimensions more clearly because it is not distinguished on your images..!!!

,,, these dimensions are good(in mm) ... ???

Hi, the dimensions you shown above are correct