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» »Simple 3G 4G Wi-Fi omnidirectional antenna
Now, in amateur radio practice, antennas for amplifying 3G, 4G, Wi-Fi signals of the Biquadrat type are very common.
Simple omnidirectional 3G 4G WiFi antenna

Such an antenna has a directional action, which may not always be a virtue, but even a disadvantage. An example is this: you need to amplify the signal of your router so that you can catch it anywhere in your home. If you use a directional antenna, then the signal will most likely be well accessible only in the field of action of this antenna. Surely this will be only one room where it will be directed. It is good to use such an antenna only for long-distance communications, provided that you know where to direct it.
To amplify your WIFI signal in all directions, an antenna is suitable, which I will show you. In its directivity characteristics, it is close to a whip antenna, with the exception of greater sensitivity.
By structure, this is actually the same biquadrat, only twice directed in opposite directions. Plus, this antenna is many times simpler than the classic biquadrat, since it has neither a stand nor a reflector.
Simple omnidirectional 3G 4G WiFi antenna

How to calculate the antenna?


Just please do not be alarmed, mathematics is fifth grade. We need to calculate only one shoulder, since the antenna is square. But first you need to find out at what frequency we will make the antenna. Personally, I will do in the example under WI-FI. It is known that the WI-FI frequency is approximately 2.4 GHz or 2400 MHz (there is also an even more modern Wi-Fi - 5500 MHz). If you do it under 3G - 2100 MHz, and 4G (YOTA) - 2600 MHz.
We take the propagation speed of radio waves (300,000 km / s) and divide by the desired frequency (2400 MHz) in kilohertz.
300.000 / 2.400.000 = 0.125 m
This we got the wavelength. Now divide by four and get the length of the shoulder of the square.
0.125 / 4 approximately will turn out 0.0315 m. Convert to millimeters for convenience and get 31.5 mm.

Making a DIY DIY Wi-Fi Antenna


Bremen thick wire 2-3 mm thick. And a template carved from a piece of aluminum. You can certainly do without him, but with him easier.
Simple omnidirectional 3G 4G WiFi antenna

Simple omnidirectional 3G 4G WiFi antenna

We bend two loops from one wire and two from another. The gap should be between the squares.
Simple omnidirectional 3G 4G WiFi antenna

Simple omnidirectional 3G 4G WiFi antenna

Simple omnidirectional 3G 4G WiFi antenna

Then, with masking tape, temporarily fix the squares crosswise so that it is easier to solder. And I solder the middle from above so that the structure becomes stiff.
Simple omnidirectional 3G 4G WiFi antenna

Simple omnidirectional 3G 4G WiFi antenna

Simple omnidirectional 3G 4G WiFi antenna

Now you need to take a thick piece of cable with a connector (you can take it from the same whip antenna).
Simple omnidirectional 3G 4G WiFi antenna

Simple omnidirectional 3G 4G WiFi antenna

Insert into the antenna and solder. The middle wire to the top, and the lower shoulders of the squares to the common.
Simple omnidirectional 3G 4G WiFi antenna

Simple omnidirectional 3G 4G WiFi antenna

Simple omnidirectional 3G 4G WiFi antenna

The antenna is ready. To complete, you can fill the soldered joint with hot glue and paint.
Simple omnidirectional 3G 4G WiFi antenna

Antenna test


Compare the signal strength with a whip antenna, which came originally with a router.
Simple omnidirectional 3G 4G WiFi antenna

Whip antenna:
Simple omnidirectional 3G 4G WiFi antenna

Now in comparison. The first pin, and then our omnidirectional biquadrat.
Simple omnidirectional 3G 4G WiFi antenna

It can be seen that our antenna receives and amplifies the signal 30% better. Here is the result of the work.
A good signal level is a guarantee of high speed Internet, which means a guarantee of stable operation. 30 percent is a very high indicator, given the fact that nothing had to be radically changed.
Build your simple antenna for 3G, 4G or Wi-Fi and no longer suffer from an unstable and weak signal.

Watch a video about building an antenna


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Comments (9)
  1. Denis
    #1 Denis Guests November 11, 2017 12:00
    3
    I highly recommend watching this video. I did on this recommendation.

  2. Guest sergey
    #2 Guest sergey Guests March 6, 2018 15:33
    2
    Probably for the radio, such an antenna will do. For the reception of 3G, 4G and other similar, I recognize only directional antennas.
  3. Guest Vlad
    #3 Guest Vlad Guests March 25, 2018 14:50
    0
    For transmitting stations, an Omnidirectional antenna may be good, but for receiving antennas, the signal should be caught from only one, because there is such a characteristic of the antenna as the signal-to-noise ratio.
  4. Nik
    #4 Nik Guests June 20, 2018 11:26 p.m.
    1
    He made "on his knee" almost the same but a three-petal petal under the wavelength, only the arched petals, the sensitivity of the antenna was very surprising, the pin "smoke in the corner"
  5. Guest Sergey
    #5 Guest Sergey Guests September 13, 2018 20:59
    2
    And how to connect such an antenna to a 3G modem ???
  6. RuslanME
    #6 RuslanME Visitors September 19, 2018 10:40
    0
    The author, and if you put on the screen behind each square, what happens, the range does not increase? - Well, as an interesting option =)
    1. Guest Sergey
      #7 Guest Sergey Guests October 2, 2018 12:40
      1
      And how are you going to set the screen on an omnidirectional antenna? Even 1 screen will reduce its omnidirectionality to nothing, and you want in front of each square. Teach physics better go, and do not bother smart uncles communicate!
  7. hvs
    #8 hvs Guests January 7, 2019 19:12
    0
    Two double squares were connected in parallel - they reduced the wave impedance, improved matching with the load, slightly narrowed the equivalent bandwidth due to the resonant properties of the frame (reduced received atmospheric noise due to the narrowing of the bandwidth) - all this gave a gain in energy by about 50%, as and shown in the picture - in principle, such an antenna should work just like that - but do not expect the best from it.
  8. Guest Andrey
    #9 Guest Andrey Guests February 14, 2019 18:37
    2
    0.125 / 4 = 0.03125. 31.25mm. This is the size of the square along the axes of the wire. Thus, for a wire of 2 mm in diameter, the template must be done with sides of 29.25 mm. Your antenna resonates at a lower frequency (much lower than the 1st wifi channel). I repeated this antenna (with my calculations, of course). Very satisfied!

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