yagi 2.4Ghz yagi

[rob 6]

I recently copied this antenna design from the internet and although I'm pleased with its performance, i have my doubts about the original configuration so i have made a change to the driven element.

The driven element on the original design appears to be coupled to the rest of the elements - surely this creates a short  circuit? so what i have done is isolated the driven element from the boom.

what do you think?

cheers.

 

[garry 36]

In the design of the antenna there is a closed connection of the elements, it should not deviate from this, since this changes the parameters of the antenna.

[rob 6]

His garry,  thanks for your advice it's appreciated. 

The reason I deviated away from the original design was due to watching a YouTube video by Andrew Mc Neil, it was he who suggested this approach. 

Cheers 

[Admin 2578]

Okay, that's better...

 

"you do not watch all the forum...!!

[rob 6]

Hello admin, obviously not.

I've been searching the forum but not deep enough.

I have now reconstructed my antenna to the original design.

Thank you for the link

[Admin 2578]

Rob, please, if you can, post YouTube video by Andrew Mc Neil and the sizes of your antenna!!

[rob 6]

Hi admin, I'll post my antenna measurements later on.

 

[Admin 2578]

 

[rob 6]

Admin, this is the design I have followed.

The measurements are the same apart from the boom which is 6mm dia, and I haven't included the 83mm lipped rear reflector.

Cheers 

 

[Admin 2578]

From here,,,http://give-all.biz/articles/samdel/samodelnaya-antenna-analog-obluchatelya-bester

These are my drawings...!!!!

 

[rob 6]

Here's my completed antenna coupled  to my new toy!

 

 

Edited April 28, 2018 by rob

[Admin 2578]

Yes it's good, but why 2.6GHz...!!??

This is the execution drawing...???

[rob 6]

Hi Admin,  yes thats the design, however I omitted the 15mm lip from around the reflector.

I'm happy with the vswr at 2.414 ghz as that's where I want to be.

The 2.6Ghz reference shown is just how I set up the analyzer stop point.

I did however try to re tune to the lowest dip point to 2.414 but had no luck.

I guess I need to move the driven element closer to the reflector to achieve this?

 

[Admin 2578]

Okay, this drawing is made by me, according to Igor Panchenko's instructions....!!!

,,,see post#8....http://www.lan23.ru/forum/showthread.php?t=42

 

[rob 6]

Good design and it appears to work well.

How does one tune this type of antenna?

 

[Admin 2578]

 ,,,, these might be the best sizes, I do not know, it should be tried....

[rob 6]

Thank you, will give it a go

 

 

[Admin 2578]

wait a minute...!!!

[Admin 2578]

Impedance adaptation still needs to be done...

[Admin 2578]

Yes ,this is it,this is the correct sizing...!!!

[Admin 2578]

This is the original antenna...

[Admin 2578]

But anyway, Ivan is smart .. !!!

[Admin 2578]

Increasing the gain in directivity of the antenna...

[garry 36]

This antenna with circular polarization? Left or right?

[Admin 2578]

23 minutes ago, garry said:

This antenna with circular polarization? Left or right?

RHCP