Biquad Antenna

[Dr. Pepper 42]

This is indeed much simpler and more stable over a wide frequency range. The idea with the directors is also not bad, perhaps with this the reflector can be a little bit smaller.

[Dr. Pepper 42]

Updated version of the Biquad in a pot for 2.4 GHz, this time with a better impedance match over a wider frequency range and vswr starting at 1 ;-). But as mentioned before there are better designs out there.

Parameters

Quote

wsq="5.7" "with square"
lsq="26.6" "length square"
h="30.7" "height"
g="0.5" "thickness mat"
w="(l-wsq)/2" "with biquad"
ded="l/4-we1/2" "distance edge"
ded2="l/4+we1/2" "distance edge 2"
l="136.1" "length biquad"
e="5.3" "edge 3 biquad"
s="7.3" "hole diameter"
s1="43.4" "length slot"
sl="0.3" "slot"
x="248.2" "reflector x"
y="128.7" "reflector y"
we1="5.3" "with edge 1"
hc="177.0" "height collector"
ang="13.9" "angle collector"

 

[Harry36 126]

You don't have sidelobes on the x-axis and quite large on the y-axis. Try resizing the reflector ;-) , this should help flatten the radiation pattern and raise the gain.You don't have X-axis sidelobes and quite large Y-axis ones. Try resizing the reflector ;-) , this should help flatten the radiation pattern and raise the gain (energy from the sidelobes will go into the main direction). The antenna is symmetrical and requires a Balun to connect the coaxial cable. It seems to me that this has nothing to do with the loop antenna (Kharchenko's bi-square), this one can be considered as a broadband dipole with a shunt or as a slot.

One of the simplest options for a balun is to lay a cable along the slot to the zero potential point (connecting the two halves of the emitter sheet) and leading it to the side of the reflector.

But this option requires a relatively small diameter cable, preferably with a TEFLON dielectric and an SMA flange crimped on it. Not everyone has such a cable. it seemed to me that at home it is easier to make the balun suggested by me on the previous page. You can multiply the dimensions in the project by 2.5 - 3 and get the dimensions for the range 1.7-2.7

If you adjust the dimensions, then the structure fits into the perimeter of a metal can with a diameter of 99 mm. This is a very simple and quick solution for home-made from scrap materials.

 

[eco32 1]

On 16.01.2017 at 4:36 PM, Admin said:

,,,a biquad antenna on PCB(10,5dBi) and panel antenna with 4biquad(16.5dBi)...

.....

Hi @Admin

Could You Please symulate it for a 1296MHZ (23cm ham radio band)?

I will try to cut this shape in laser from metal sheet. Thats my idea to add N or SMA  connector. Lets fin out, how it will work with comparing to my biquads

Edited October 30, 2022 by eco32

[Admin 2275]

,,, these would be the simulations and dimensions...!!!!

[eco32 1]

8 hours ago, Admin said:

,,, these would be the simulations and dimensions...!!!!

Thank YOU!

I see the qain is smaller than I got, how it will be with 90deg, i belive that is possible to get 14dBi

[eco32 1]

On 13.05.2022 at 10:38 PM, Dr. Pepper said:

Biquat + Horn for 2.4 - 2.5 GHz & optimized for gain

 

 

 

 

WOW!

@Dr. Pepper You got 16dBi !!!  I got only  14dBi

 

I cant change angle of the box in Matlab, thats my limitation.

I like to try it on 1296MHZ

@AdminMay We have other section for 1296MHZ 23cm band antennas?

[Admin 2275]

7 hours ago, eco32 said:

 

@AdminMay We have other section for 1296MHZ 23cm band antennas?

,,,yes, maybe we should..!!!

[Dr. Pepper 42]

The angle of the box is very important. It influences not only the gain but also swr, bandwith and so on.

[eco32 1]

That's my version of this antenna:

(BOX completely incidental, should be other size)

size

55x38x26cm

bottom : 51x34cm

[Admin 2275]

Eco, the box is very big and has no point, and the biquad antenna is connected like this...

[marcosled86 2]

On 11/2/2018 at 5:00 AM, Admin said:

this file type is not good...??

 

biquad.dxf

biquad.gbr

I just made this antenna and i can only say it works like a charm! and very easy to do.