Harry36

3 hours ago, Admin said:

,,, that's what it would look like ... !!!

This is 50 Ohm version.

edge feed - 2mm

height 2.4 mm

nut m3 (h =2.4) nylon 2 pcs

screw m3 (l =10 mm) nylon from edge 4 mm

vvibrator_1.1.cst

14 minutes ago, Dr. Pepper said:

Here you find the size without the horn:

 

Sputnik_V1727.cst

what do you think about the losses of copper and galvanized steel?

0.01 dBi?

On 29.05.2022 at 11:07 AM, Admin said:

D1=45x45mm

I don't get the specs for that size.

6 hours ago, Dr. Pepper said:

I have a SAA2 NanoVNA which costs about 80 Euro but can only measure up to 3 GHz, if you want to measure up to 6GHz you have to spend about the double for it. I think such a VNA is the most basic tool to measure any antenna. It gives you the ability to correct the antenna that it works like it should. 

LiteVNA costs about $80 for the 2.8-inch version. https://aliexpress.ru/item/1005003802185241.html?spm=a2g2w.productlist.0.0.616ed52d8qmiOH&sku_id=12000027216067991

and about $100 for the 4" version https://aliexpress.ru/item/1005004126788962.html?spm=a2g2w.productlist.0.0.616ed52d8qmiOH&sku_id=12000028123208491

The prices for these devices are very affordable and they work quite accurately.

https://ypylypenko.livejournal.com/101234.html

Structural aluminum dipoles are very expensive to make at home, and can be made even easier with galvanized steel.

IMHO for lte1700-2700 very nice

38*38*6 mm

steel

make directors from a core of a copper cable for electrical wiring (see the typical diameter from the wire section). The directors holder can be made from a thin strip cut from galvanized steel, like the butwing itself, the directors can be soldered onto the holder simply and quickly. you can fix the holder to the "batwing" racks with rivets.

and I would slightly increase the size of the antenna so that the maximum gain falls on the desired frequency (2.45) or to capture the entire band 1700-2700 in SW<2...1.5.

the size of the antenna (more precisely, the reflector) will directly determine the gain

great job!

there's still some tuning left

in the region of 2 GHz there is a break in the SWR graph. change the dimensions of the directors (diameter and height above the batwing, it is not necessary to do everything at the same height) and you should get a broadband antenna like I have on Lan23

Making a narrowband antenna is not so difficult, but stretching the bandwidth to the maximum is much more interesting

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.

12 hours ago, Dr. Pepper said:

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

 

 

 

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wsq="5.8" "with square"
lsq="24.1" "length square"
h="23.1" "height"
g="0.5" "thickness material"
w="(l-wsq)/2" "with biquad"
ded="l/4-we1/2" "distance edge"
ded2="l/4+we1/2" "distance edge 2"
l="158.3" "length biquad"
e="4.3" "edge 3 biquad"
s="4.8" "hole diameter"
s1="49.0" "length slot"
sl="0.5" "slot"
x="248.2" "reflector x"
y="128.7" "reflector y"
we1="4.0" "with edge 1"
hc="177.0" "height collector"
ang="13.9" "angle collector"

 

This antenna can be used in a wider range without visible loss.

It can be done much easier. please display the SWR graph from 1. It cannot be less than 1 (apparently CST does not know this), this complicates the reading of the graph.

To increase the gain, you can use the director system. Read the topic

BiQuad + Balun 5150-6450 (wi-fi 5+6+7)

biquad_5065.cst

array 4x4

in progress

directivity ~ 17 on 6000

biquad 4500(Russian 5G)-6000

t=0.2mm

h=12.5

reflector = 56x56 mm

connector - SMA

,,,biquad for 1700-2700 MHz-dimensions...