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Smartphone antenna in 3 minutes

May 31, 2018 Useful and interesting / Useful Tips 234 055 17

The easiest way to increase the signal level of your cell phone in a few minutes. You will not need absolutely anything except a piece of wire of a certain length. This method will definitely help in a difficult life situation.
Before finalizing the cell phone, I show the initial signal level.

Now it is: minus 99 dB - 7 units.
We disassemble the smartphone, namely, remove the back cover. SIM cards, a battery and so on are hidden under it. We are interested in antenna connectors.

Usually, there is only one connector for connecting an external GSM antenna, but sometimes there can be several: wi-fi, 4G, 3G. See the captions to them. We are interested in the GSM jack.

Making the simplest antenna for a cell phone

Now you need to take a piece of wire in isolation, with a central core of such a diameter that is inserted into the central socket of this connector. Postings must be exposed on one side for connection.

But this is not so simple: this wiring must have a certain length so that it works as efficiently as an external antenna.
Namely, its length should be 1/4 of the wavelength. The wavelength can be calculated by the frequency at which your cell works.
Most phones work in the range where the average frequency will be 1.9 GHz. But there are exceptions as in my case - 0.8 GHz.
Now you need to calculate the wavelength, for this you can use the many online services on the network.
So:

For a frequency of 0.8 GHz - 38 cm, now divide by 4 and get the antenna wiring length - 9.5 cm.
And for the frequency of 1.9 GHz - 16 cm, divide by 4 and get - 4 cm.

We cut the desired length of the wire and insert the bare end into the antenna connector.

It can be bent from the top so that it does not protrude from the body.

Distribute it in the area of the battery.

We hold the antenna with your fingers, you can fix it with a piece of tape.

Close the back cover of the smartphone.

The result is visible immediately. The level increased to minus 85 dB and amounted to 14 units, which is pretty good.

Well, if you find yourself in a completely hopeless situation and can not calculate the length of the wiring - take any segment.
Bye everyone.

Watch the video

come back

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Comments (17)

#1 Ildar Guests June 1, 2018 09:42
12

Never do this because it is a jack for testing your phone. Inserting the wire you will fail a very sensitive element - the radio module. The phone after that is not able to work for its intended purpose.
- To answer
1. #2 cat Guests June 1, 2018 2:21 p.m.
  10
  
  Nonsense! Nothing will happen to the phone, but there will be no antenna
  
  To answer
  1. #3 Stoned astronaut Guests June 7, 2018 05:15
    4
    
    Ildar is right, in Samsung it is a diagnostic connector of the radio module, in combination it is also an antenna connector. It does not disable the radio module, but hardware disables the antenna built into the phone and to bring it back to life does not always go out even with firmware if there is no original csc. Starting with the Galaxy s4, more than one idiot said goodbye to the normal operation of the built-in antenna.
    
    To answer
2. #4 Anonymous Guests June 2, 2018 11:31
  5
  
  Bullshit. This is exactly the antenna input. But the antenna cannot be positioned in this way - the wavelength is not maintained. And the antenna itself turns out to be polarized - when you turn the phone in a different plane, it will not catch anything at all.
  
  To answer
  1. #5 Stoned astronaut Guests June 7, 2018 05:17
    0
    
    No, not him, this is a diagnostic connector with a trigger on the radio module, when it is activated, the internal antenna is turned off until the csc backup firmware is installed and it does not always help.
    
    To answer
#6 Nick Guests June 1, 2018 4:07 p.m.
1

And I do not have such a connector
- To answer
#7 Iskander Guests June 1, 2018 18:32
9

I have a phone without a cover. where to embed? (Rzhevsky, keep quiet!)
- To answer
#8 Anonymous Guests June 2, 2018 11:29
2

The cover to the phone fits sooo tight. Do not close, and the location of the quarter-wave antenna will somehow lead to a lack of signal amplification. Or even weakening it.
- To answer
#9 Oleg-sg Guests June 2, 2018 9:26 p.m.
5

A man is not friends with physics. If the wire is bent, then shorten it like an antenna
- To answer
1. #10 Oleg-Ga Guests June 5, 2018 14:11
  1
  
  What nonsense is this?
  Generation of the exam, damn it.
  Have you seen antennas in Wi-Fi modules?
  
  To answer
#11 Volkon Guests June 3, 2018 1:49 p.m.
0

.... Well, if you find yourself in a completely hopeless situation and can not calculate the length of the wiring - take any segment.
- I connected a broken rural electricity network. The smartphone has stopped working!
- To answer
#12 Guest Andrey Guests June 4, 2018 10:26
4

An antenna is already installed inside the phone. Engineers, to the extent possible, adapt it to the limited space of the enclosure and adjacent metal parts. Any "insertion" of the wiring into the socket, all the more pressed against a metal battery, will, in the best case, lead to a random small change in sensitivity.
- To answer
1. #13 gvsp Guests June 18, 2018 15:25
  2
  
  Namely, engineers like idiots, would you not have guessed to make such an antenna? Or is it a conspiracy of engineers to put communication towers more?
  
  To answer
#14 Guest Sergey Guests June 8, 2018 08:51
0

The tip is very harmful, inserting the wire will damage the internal movable contact of the socket and then when you disconnect this wire the phone will no longer find the network. For this connection of external antennas, special plugs (pigtails) are required.
- To answer
1. #15 CTC Guests July 3, 2018 2:23 p.m.
  1
  
  communication catches nonsense as before after disconnecting the wire
  
  To answer
#16 Dmitry Guests June 28, 2018 10:45
1

Ooooh, embed climbed. Che, the phone does not catch?
- To answer
#17 Andrei Guests December 7, 2018 20:58
2

Well, you damn scribe what kind of smart ... This jack is designed to connect an external antenna and then disconnect the built-in antenna ... look stupidly on the phone circuit ... my smart one is very sensitive with a piece of wire on the back of the head + 25 - 30% signal increase. .. read literature clever ...
- To answer