Antenna extender for sim900a module


Joined Dec 13, 2013
an antenna length of 1 mn would not work, the wavelength is much shorter. 900 mhz antenna is about 35 cm, and 1800 mhz is about 17.5 cm.
also, if you are in the US, it woluld be illegal to modify the antenna on the module.

Thread Starter


Joined Feb 2, 2012
1. then what is the maximum antenna lenght I could increase.

2. I have to modify the design for it. but current antenna is very small

Edit: as you had mentioned, is the actual antenna is maximum lenght I could have