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rob

yagi 2.4Ghz yagi

239 posts in this topic

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.

 

2.4 yagi.jpg

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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.

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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 

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Okay, that's better...

57.thumb.jpg.70c1293f415dcbd3b83cc33a828c7a02.jpg

garbeala_01.jpg.2b64fc9c1b9b20b596e6683d402ff8ef.jpg

 

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

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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

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

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

 

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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 

 

Screenshot_20180330-191223.png

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

 

 

20180428_184727.jpg

20180428_184914.jpg

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

This is the execution drawing...???

path.jpg

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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?

 

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Good design and it appears to work well.

How does one tune this type of antenna?

 

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

191.JPG

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Impedance adaptation still needs to be done...

rob_01.jpg

rob_02.jpg

rob_03.jpg

rob_04.jpg

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


99.jpg

191.JPG

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This is the original antenna...

BDM_4.JPG

bester_oblushatel.jpg

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But anyway, Ivan is smart .. !!!

anigif.gif

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Increasing the gain in directivity of the antenna...

592.jpg

image (2).jpg

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This antenna with circular polarization? Left or right?

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23 minutes ago, garry said:

This antenna with circular polarization? Left or right?

RHCP

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