Improve Phone Antenna Design: Don't Buy from Shaosan Li

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SUMMARY

This discussion centers on improving the antenna design of a poorly performing Chinese phone purchased from Shaosan Li. The user experienced inadequate reception, only functioning effectively outdoors. A temporary solution involved using insulated copper wire to enhance the internal antenna, yielding slight improvements. For optimal results, the user is advised to calculate the quarter wavelength of the antenna using the formula L = 75 / F, where F is the frequency in MHz, specifically noting that for 2400 MHz, the length should be approximately 3.125 cm.

PREREQUISITES
  • Understanding of antenna theory and design
  • Basic soldering skills for electronic modifications
  • Familiarity with frequency calculations
  • Knowledge of mobile phone hardware components
NEXT STEPS
  • Research antenna design principles for mobile devices
  • Learn about soldering techniques for electronics
  • Explore the impact of antenna length on signal reception
  • Investigate alternative materials for antenna enhancement
USEFUL FOR

This discussion is beneficial for electronics enthusiasts, mobile phone repair technicians, and anyone looking to optimize mobile device reception through hardware modifications.

chr15
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I made the mistake of buying a cheap Chinese phone on Ebay
(don't buy phones from Shaosan Li)
The reception was useless and in only worked in direct line of sight of a phone tower less than 50 m away.
With nothing to lose I pulled the back off the phone and located the internal antenna, and using the battery I jammed a loop of insulated copper wire against it.
It now works a little better - Great outdoors but only sms indoors.
Is there someone here that can save me weeks of trial and error and tell me the
optimal length / thickness / material I should use to improve reception even more ?
 
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Contact the seller and negotiate a return of the phone. If not, contact EBay. These sellers really don't want negative reports on EBay.


If you really have to modify the phone, you can calculate the length of a quarter wavelength of antenna as follows:

L = 75 / F

Where F is the frequency. If F is 2400 MHz, the length would be 75 / 2400 meters or 3.125 cm.

Strictly, it should be a little bit shorter than this, but if you cut a piece of wire to this length, it might be worth a try. You would have to solder it to where the existing antenna joins on.

This might do some good, but it is only a last ditch approach. It probably won't work.
 

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