Simple Omnidirectional 3G 4G Wi-Fi 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 effect, which may not always be an advantage, but even a disadvantage. An example is this: you need to strengthen the signal of your router so that you can catch it in any part of your house. If you use a directional antenna, the signal will most likely be well accessible only within the field of action of this antenna. Surely there 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 point it.
To strengthen your WI-FI signal in all directions, an antenna is suitable, which I will show you. Its directivity characteristics are close to those of a whip antenna, with the exception of greater sensitivity.
In structure, it is actually the same biquadrate, only twice directed in opposite directions. Plus, this antenna is many times simpler than a classic biquad antenna, since it has neither a stand nor a reflector.
Simple Omnidirectional 3G 4G WiFi Antenna

How to calculate an antenna?


Just please don't be scared, fifth grade math. We only need to calculate one arm since the antenna is square. But first we need to find out at what frequency we will make the antenna. Personally, in the example I will do it 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 speed of propagation 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 is how we got the wavelength. Now divide by four and get the length of the arm of the square.
0.125/4 will approximately turn out to be 0.0315 m. Let's convert it to millimeters for convenience and get 31.5 mm.

Making a simple DIY Wi-Fi antenna


Brem thick wire 2-3 mm thick. And a template cut from a piece of aluminum. You can, of course, do without it, but it’s easier with it.
Simple Omnidirectional 3G 4G WiFi Antenna

Simple Omnidirectional 3G 4G WiFi Antenna

We bend two loops from one wire and two from the other. 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, I temporarily fix the squares crosswise with masking tape to make soldering easier. And I solder the middle on top so that the structure becomes rigid.
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 the antenna inside and solder it. The middle wire goes to the top, and the lower arms of the squares go to the common wire.
Simple Omnidirectional 3G 4G WiFi Antenna

Simple Omnidirectional 3G 4G WiFi Antenna

Simple Omnidirectional 3G 4G WiFi Antenna

The antenna is ready. To finish, you can fill the solder joint with hot glue and paint it.
Simple Omnidirectional 3G 4G WiFi Antenna

Antenna tests


Let's compare the signal strength with the whip antenna that originally came with the router.
Simple Omnidirectional 3G 4G WiFi Antenna

Whip antenna:
Simple Omnidirectional 3G 4G WiFi Antenna

Now in comparison. The first one is pin and then our omnidirectional biquad.
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 the key to high Internet speed, which means stable operation. 30 percent is a very high figure, considering the fact that nothing had to be changed radically.
Make your own simple antenna for 3G, 4G or Wi-Fi and no longer suffer with an unstable and weak signal.

Watch a video about building an antenna


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Comments (11)
  1. Denis
    #1 Denis Guests November 11, 2017 12:00
    4
    I highly recommend watching this video. I followed this recommendation.

  2. Guest sergey
    #2 Guest sergey Guests 6 March 2018 15:33
    4
    Probably such an antenna would be suitable for a radio. To receive 3G, 4G and other similar ones, I only accept directional antennas.
  3. Guest Vlad
    #3 Guest Vlad Guests 25 March 2018 14:50
    3
    For transmitting stations, an omnidirectional antenna may be a benefit, but for receiving antennas, the signal must be caught from only one, because there is such an antenna characteristic as the signal-to-noise ratio.
  4. Nik
    #4 Nik Guests 20 June 2018 23:26
    2
    I made “on the knee” an almost similar one, but a three-leaf lobe for the wavelength, only the petals are arched, I was very surprised by the sensitivity of the antenna, the whip ones “smoke in the corner”
  5. Guest Sergey
    #5 Guest Sergey Guests 13 September 2018 20:59
    10
    How to connect such an antenna to a 3G modem???
  6. RuslanME
    #6 RuslanME Guests September 19, 2018 10:40
    4
    Author, if you put a screen behind each square, what will happen, the range will not increase? - well, what an interesting option =)
    1. Guest Sergey
      #7 Guest Sergey Guests 2 October 2018 12:40
      4
      How are you going to install a screen on an omnidirectional antenna? Even 1 screen will reduce its omnidirectionality to nothing, but you want it in front of each square. Better go study physics and don’t interfere with smart guys communicating!
      1. Guest Dmitry
        #8 Guest Dmitry Guests 15 April 2023 20:17
        0
        As an option from a non-physicist: a cone from below and a cone from above.
  7. hvs
    #9 hvs Guests 7 January 2019 19:12
    1
    Two double squares were connected in parallel - they reduced the characteristic impedance, improved the matching with the load, slightly narrowed the equivalent passband due to the resonant properties of the frame (reduced received atmospheric noise by narrowing the passband) - all this gave a gain in energy by about 50%, as and shown in the picture - in principle, this is how such an antenna should work - but don’t expect anything better from it.
  8. Guest Andrey
    #10 Guest Andrey Guests 14 February 2019 18:37
    6
    0.125/4 = 0.03125. 31.25mm. This is the size of the square along the axes of the wire. Thus, for a wire 2mm in diameter, the template must be made with sides of 29.25mm. Your antenna resonates at a lower frequency (much lower than the 1st wifi channel). I repeated this antenna (with my own calculations, of course). Very satisfied!
  9. Sakamoto
    #11 Sakamoto Guests 10 August 2023 21:58
    0
    double square is the best antenna in terms of gain-complexity-capriciousness, etc... on TV I tested different antennas with amplifiers, the best result was shown by double square