hi double biquad antena

[carlosmiran 0]

 

 

,,,14dBi  it"s real...??

[Admin 2546]

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

"But it can be so ...

 

[aurel 22]

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

[Admin 2546]

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

 

 

[aurel 22]

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

[Admin 2546]

[aurel 22]

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:

 

[Admin 2546]

,,,okay, I will try both variants...!!!

[vodkaman 1]

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

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

"But it can be so ...

 

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

[Admin 2546]

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

[Admin 2546]

,,,this it is...

[Admin 2546]

,,,and the *cst file

gnutika60.cst

[vodkaman 1]

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.

[Admin 2546]

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

[vodkaman 1]

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?

[Admin 2546]

,,,everything is possible...!!!

[vodkaman 1]

To which value should i change “k” parameter?

Edited January 30, 2020 by vodkaman

[Admin 2546]

,,,,k=2,1/2,442=0.86*0,85=0,73

[vodkaman 1]

Oh, shit! How should i know this?

[Admin 2546]

[vodkaman 1]

Here is what I've got for 50 Ohm:

 

Edited January 30, 2020 by vodkaman

[vodkaman 1]

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

Edited January 30, 2020 by vodkaman

[Admin 2546]

,,, 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...!!!

[vodkaman 1]

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

[Admin 2546]