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carlosmiran

hi double biquad antena

39 posts in this topic

Yes, it's real this gain in directivity...!!

"But it can be so ...

 

14564008.jpg

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Hello

This design of double biquad i don't see yet anywhere?

Is dimensions the same as classic D-biquad or last outer element is 3x4cm i mean triangle sizes?

And also ..this forum is really great and i am glad that such a forum exists .

So when i am here i must ask something.

Is there a way to use minkowski fractal shape to build biquad ?

I would like to try it !

thanks ..Aurel

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,,,for which this antenna is a variant to that ... ???

 

4f.jpg

 

a-koef-1.jpg

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Hi Admin

My first question is about image A - is size of element 32mm?

sorry i am not good with calculatioins..

second question is about classic biquad 1/4 just with minkowski shape

on image B...

i hope that is possible?

thanks

BiQuads.png

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Thanks ..so it is 46mm ..thanks

For image B i am not sure because this is some sort of koch fractal shape 

but i see somewhere but like this:

 

BQ1.png

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On 1/7/2019 at 6:41 PM, Admin said:

Yes, it's real this gain in directivity...!!

"But it can be so ...

 

14564008.jpg

Admin, do you have other plots of this antenna, and sizes if possible?

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 I will search the file and post the details....!!!

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Thanks a lot, Admin, but it's 2.4 GHz. May be you have sizes for 2.1 GHz? I know that it can be scaled, but still.

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,,,you must only change the parameter "k" in the Parameter List...!!!

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Now i see. It’s very kind of you, to give parametric model. I need to learn how to create models based on parameters. 

Is it possible to make parametric polygons, Admin?

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To which value should i change “k” parameter?

Edited by vodkaman

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Here is what I've got for 50 Ohm:

 

3D.PNG

ImRe.PNG

VSWR.PNG

Edited by vodkaman

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Gain.PNG

Sorry, I don't know how to control size of the pictures.:(

Edited by vodkaman

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,,, gnutika antenna is for impedance of 75 ohms, if you want 50 ohms change the height "h" and the dimensions of the reflector....!!!

,,,and the coefficient "k" must be modified...!!!

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I wanted to check how broadband it is. And 50 Ohm can be obtained by narrowing the gap at feed point (in some limits). 

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