Yagi antenna

[ILSAPP]

Hello all,


I recently got this yagi antenna and would like to know if is possible to get the approximate frequency range it can most efficiently be used for receiving. Please see the atatched pdf file with all the measured distances.


Thank you!

 

[nick1427d]

are you asking what frequency range it's designed for?

 

[ILSAPP]

yes... based on measurements I did not find any particular range of frequencies it may be tuned for...
For example, all directors are equally spaced which is not common as far as I know.
I found that 1.2-1.3GHz maybe a candidate but would like to have an expert opinion about this...

 

[ad5kl]

That looks similar to my antenna. Mine is a Wilson cellular yagi for 806MHz-896MHz.

301111 - Wilson Cellular Yagi (806MHz-896MHz) Cell Phone Antenna

But the one in your pic has equally spaced elements, so I'm not sure.

 

[ILSAPP]

Intersting... Apart from the apparent dimensions, is very similar... Can you provide your dimensions or compare them with the pdf file I attached please?

 

[mm]

ILSAPP your right on about it being a 1200 to 1300 Mhz antenna,

Taking the diameter of the elements and the lengths of the directors and the reflector elements it comes out around 1290 MHz, it appears to be a 23 cm ham band antenna.


It's hard to read the folded dipole dimensions but again the reflector and directors are close for 1296 Mhz.

 

[hd625b]

I found an on-line calculator at Amateur Beam Antenna Calculator
Based on the reflector length and the element spacing the frequency should be 1160 Mhz.

 

[LtDoc]

I think it's 'approximate' range would be around 1.5 Ghz, give or take about 50%. That more or less agrees with all the other guess. Not having much experience with 'microwaves', I wouldn't even try to guess it's 'usable' range.
- 'Doc

 

[ILSAPP]

Thanks for all your help.
If you want I can give you all the dimensions regarding the folded dipole part.
If I have enough experience with NEC soft I also would try to design this antenna there and try some simulations to get also the expected radiation pattern as SWR is not only what matters...

 

[k9rzz]

That's a commercial WiFi antenna. I have one just like it, only a little longer. Plug that little SMA connector into a WiFi USB dongle and you're good to go. They actually do work pretty well!

Look on ebay, that's where you'll find 'em just like it.