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[ctich]

WI-FI Antenna
Antenna for LTE | 3G antenna | 3G / WiFi antenna in the tablet

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Useful links:

WI-FI Antenna 15V3
Wi-fi antenna FA20 17-22db (FA-20)
Calculator - Homemade antennas Wi-Fi, 3G, 4G, GPS

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Post has been editedctich - 11.08.17, 12:01

Reason for editing: FA20 17-22db Wi-fi antenna

[rostikzh]

steam.eanwar,
It is impossible to alter with DWB - S (satellite protocol) in the Wifi!
But, take the Internet from the satellite, then .. yes! (Modern protocol, supports frequencies from 9 to 12 with kigaks GigaHerts / second: yes2:
Negotiate with the Internet provider (on a specific satellite, a particular country / main provider) (pay for the use of services), and go!
They will provide you with high speed, you will have enough of it, you will sell your neighbors, even by cable, even though an external Wi-Fi router. And you will be also an Internet mini-provider for yourself! : yes2: (many leftists, pseudo-providers, do just that).
Here, the installation system itself of this, (single head (for receiving neta), or (two head, and for return to satellite, search queries), will be considered: offtopic:

I just gave you an opinion on the possibilities of satellite reception. (Details, it's easy to dig in nete !!)

(I live in the mountains, analogue TV communication, it’s badly accepted, life has forced me, more than 15 years, satellite communication, to become interested and enjoy)) :-D

Post has been editedrostikzh - 12.02.19, 15:56

[vars-cat]

Homemade "adapter" for connecting the sma connector with a 75 Ohm cable.

Attached images

Post has been editedvars-cat - 23.02.19, 10:55

[rostikzh]

vars-cat,
: good: great.

[vars-cat]

I tried to make a simple version of the antenna bythis drawing.
Instead of installing the cable directly, a television plug with a pin thickness of 2.4 mm was used.The promise of the author of the drawing to recalculate the antenna for a cable without braid remained unfulfilled.
Installing the patch exactly and at the right height turned out to be very difficult.
Possible reason:

Thin bolts are less sensitive to distortions resulting from the non-perpendicularity of the bearing surfaces of the head and nut, as well as the non-parallelism of the threaded girdle with respect to the bolt axis.

Though less, but still sensitive. Therefore, I believe that instead of small nuts it is better to use (after recalculating the antenna in the simulator) racks of a caprolon rod or a connecting nut.

About the connector. The pin in such a connector is held only by the dielectric, and if the soldering iron overheats, the pin can break contact with the rest of the connector. Therefore, the best option is to solder the cable directly. Using a flanged F-connector seems much worse, since such a connector is very difficult to find (especially with a long pin), and it is problematic to attach to a thin galvanized sheet.

Attached images

Post has been editedvars-cat - 01.03.19, 20:09

[PHPoeniX]

Antenna Calculators

[Balkarik]

Hi guys, I have this antennahttps://bester-ltd.ru/...bester-parabolic-2400/maybe someone needs? Write to koumiss ...

Posted 03/20/2019, 15:21:

Power 24db, range 2400-2483 MHz

[mevlevi]

Tell the program to calculate the antenna. I want to connect the WiFi adapter through the SMA connection to a regular TV cable that goes to the antenna. Which antennas are better, so that you can catch WiFi in a radius of 2 km?

[plyrvt]

Mevlevi @ 04/05/19, 11:18

Tell the program to calculate the antenna.

https: //en.wikipedia.o…EM_simulation_software

Ansys HFSS, CST Microwave Studio, FEKO, ComSol, Microwave Office
90% of antenna calculations in the world and in the CIS are done in the first two

I want to note that the programs themselves do not invent antennas and do nothing themselves. They only carry out a "virtual" dimension of the drawing that you drew yourself. It is necessary to draw the drawing and resize yourself. Then start the "simulation" and view the results. If the results do not satisfy - you yourself should know what needs to be changed in the drawing.

Which antennas are better, so that you can catch WiFi in a radius of 2 km?

No antenna will help this. no matter how large the antenna is, it will equally enhance both the desired and undesired APs from this direction, therefore, the signal-to-noise ratio does not improve

The largest non-parabolic antenna that you can really repeat yourself is 17 dBi
https://ypylypenko.livejournal.com/56724.html

all that is more than 17 dBi are only parabolic mirrors (there are no restrictions here, even use a 10-meter mirror)

Post has been editedplyrvt - 05.04.19, 12:08

[vars-cat]

plyrvtwhy then do you need

Plyrvt @ 04/05/19, 11:31

Maximumlargenon-parabolic antenna which is really repeat yourself

if a

Plyrvt @ 04/05/19, 11:31

No antenna will help this. howeverlargethe antenna was not

Plyrvt @ 04/05/19, 11:31

it will equally enhance both the desired and undesired APs from this direction, therefore, the signal-to-interference ratio will not improve

But the useful signal is likely to become more. Assume that initially there were 10 units of the useful signal and 5 units of interference. 10-5 = 5 units useful signal. After applying an antenna that amplifies the signal and noise 10 times, it turns out 10 * 10 - 5 * 10 = AF 50 units. useful signal. Or does it still give nothing?

[plyrvt]

vars-cat @ 04/09/19, 19:19

why then do you need

So I say that it is not needed, but I explain it step by step

vars-cat @ 04/09/19, 19:19

Or does it still give nothing?

signal-to-noise ratio as it was 3 dB remained.
Which SNR corresponds to which speed mode can be found here:
https: //d2cpnw0u24fjm4…11ac-MCSSNRandRSSI.png

To connect to the maximum speed of 150 Mbit (40 MHz) or 72 Mbit (20 MHz), the s / n should be no worse than 28 and 25 dB, respectively.
If, in fact, the S / N is only 3 dB, then in 40 MHz mode it is impossible to establish a connection at all (even for a 15 Mbit chip rate, you need 5 dB), and in 20 MHz mode, you can get a 7.2 Mbit chip rate in the slowest possible MCS-0 / Bpsk.

if TD wants to catchmevlevilonely (there are no other APs at a working frequency within a radius of 500 meters) you can catch from 2 km
but in the conditions of a typically modern settlement there are several hundreds of TDs everywhere. Not that from 2 km, but from 30 meters from a typical apartment building - to catch is very bad. the total power of interfering TDs on any frequency channel exceeds the power of the desired TDs. At any distance, this ratio will not improve.
Even if you move 2 km away from the city and pull a parabola with a diameter of 5 meters into this house, the signal-to-interference ratio will remain the same, just like walking to this house

Post has been editedplyrvt - 09.04.19, 19:48

[vars-cat]

And if in the general case (not necessarily wi-fi), then how does a more powerful antenna usually work better than a weak one if the signal-to-noise ratio remains the same?

And about the panel at 17 dBi.
What is the thickness of the wide strip that goes from the wire to the cable joint?
Is the height h of the sleeve calculated for any specific thickness of galvanizing for making patches?

[plyrvt]

vars-cat @ 04/09/19, 20:37

And if in the general case (not necessarily wi-fi), then how does a more powerful antenna usually work better than a weak one if the signal-to-noise ratio remains the same?

through the use of the army, aviation, navy and police against violators.
Frequency is a protected natural resource. interfering signal source is quickly detected and eliminated.
all states contain special technical services (SCRF) that assist the police and the army in the rapid detection of the offender

The 2.4 GHz band is unlicensed, you just need to comply with the restrictions in the EIRP<100 mW in any direction. Therefore, several dozens of access points in sight are working on the same frequency. The 802.11n protocol is designed so that in the presence of collisions it reduces the speed, but retains some performance.

In licensed communications, the licensee makes or orders a miscalculation of electromagnetic compatibility, i.e. territorial-frequency planning of transmitters so that the signal-to-noise ratio satisfies the needs of the technology for which it received a license.

vars-cat @ 04/09/19, 20:37

What is the thickness of the wide strip that goes from the wire to the cable joint?

Tw

vars-cat @ 04/09/19, 20:37

Is the height h of the sleeve calculated for any specific thickness of galvanizing for making patches?

the thickness of the patch material within 0.1-1 mm has little effect on the parameters of a single vibrator, and this effect primarily on the resonant frequency (ie, on the jX curve). The resonant frequency of a round patch depends primarily on its diameter, the second from the gap to the reflector and last of all the thickness of the disc material (for small thicknesses, it’s natural that if you take 1 cm there, the effect will be very large).
In other words, the effect of material thickness is primarily compensated for by the diameter (this is similar to the shortening factors for dipoles and wave channels - the thicker the bar, the longer its actual length and the more it must be shortened geometrically).
In the calculation of the material thickness 0.5 mm (for galvanization). For 0.3–0.8 mm, nothing can be done, for 1–1.5 mm (such as aluminum), it is desirable to recalculate, it is possible that the disc diameter will decrease by a fraction of a millimeter.

Post has been editedplyrvt - 09.04.19, 20:51

[vars-cat]

[email protected], 20:49

Tw

TW is width (W = Width), TL is length (L = Length), the variable TT is missing (T = Thickness). In order not to work out as with BDM-2 (which I haven’t yet completed because of the death of the Bulgarian), it is advisable to specify everything to the smallest detail. Such as,

[email protected], 20:49

In the calculation of the material thickness 0.5 mm (for galvanization). You can do nothing for 0.3-0.8 mm

vars-cat @ 04/09/19, 20:37

And if in the general case (not necessarily wi-fi), then how does a more powerful antenna usually work better than a weak one if the signal-to-noise ratio remains the same?

[email protected], 20:49

through the use of the army, aviation, navy and police against violators.
Frequency is a protected natural resource. interfering signal source is quickly detected and eliminated.
all states contain special technical services (SCRF) that assist the police and the army in the rapid detection of the offender

The 2.4 GHz band is unlicensed, you just need to comply with the restrictions in the EIRP<100 mW in any direction. Therefore, several dozens of access points in sight are working on the same frequency. The 802.11n protocol is designed so that in the presence of collisions it reduces the speed, but retains some performance.

In licensed communications, the licensee makes or orders a miscalculation of electromagnetic compatibility, i.e. territorial-frequency planning of transmitters so that the signal-to-noise ratio satisfies the needs of the technology for which it received a license.

: suicide:

[Royd]

Plyrvt @ 04/04/19, 23:43

but in the conditions of a typically modern settlement there are several hundreds of TDs everywhere. Not that from 2 km, but from 30 meters from a typical apartment building - to catch is very bad.

And what are the prospects for the organization of bridges at a frequency of 5 GHz? With 2.4 for a long time everything is clear. Five rests on what? I know about faster damping of the waves at this frequency. But 2 kilometers, really fantastic?

[plyrvt]

Rroyd @ 04/04/19, 10:11

I know about faster damping of the waves at this frequency. But 2 kilometers, really fantastic?

All waves have identical attenuation, at least 1 MHz, even ultraviolet.
The difference between different frequencies - in size (aperture, absorption area) of the receiving antenna
In order to maintain the omnidirectionality of the antenna at high frequencies - it is necessary to reduce its size, the antenna area falls proportionally to the square of the frequency if you want to maintain omnidirectionality
More detailsabout it here

Rroyd @ 04/04/19, 10:11

And what are the prospects for the organization of bridges at a frequency of 5 GHz?

here in Ukraine, they are rapidly being built and are well exploited for distribution to customers (mainly on the Nanostation M5). for trunk links, the speeds are already too low, they use specialized RRLs not related to the 802.11n / ac protocol

[Goryna]

Plyrvt @ 04/05/19, 18:31

The largest non-parabolic antenna that you can really repeat yourself is 17 dBi
https://ypylypenko.livejournal.com/56724.html

And you can give a description in Russian how to repeat it yourself (in the topic of antennas Wi-Fi kettle, but with hands from the right place).