Any body has any idea how o make a 4G Antenna?

 

Yes... http://forum.allaboutcircuits.com/threads/5ghz-antenna-using-a-piece-of-coax.115790/#post-905714

Adjust the length as appropriately.

 

It's 4G not 4GHz.
Will that work for me ?

 

Do you mean 4G as in cellphone signals? Then you need an antenna to match the cellphone type in your area. 900MHz or 1800MHz. To find the proper antenna length you divide 300 by the frequency. Then you get a full wave antenna. Divide that by 4 and you get a quarterwave antenna.

I think it is like that... What are you building?

 

If the antenna is to be mounted remote from the phone, you will need a coax feedline (short as possible, because coax losses are very high at those frequencies). The antenna will have to be in the form of a 1/2λ dipole (not just a 1/4λ monopole). You will also have to devise some means of coupling the coax to the cell phone, which likely does not have an antenna connector for external antennas.

 

I will do some research and get back

 

A half wave antenna at 900mhz is approximately 16cm, (6 inch)

http://bcbj.org/antennae/lte_yagi_diy.htm

 

Hello,

4G can have many frequencies depending on the country you are in.

On the wikipage on 4G you will find more info about the frequencies and the ranges used:

https://en.wikipedia.org/wiki/4G

Bertus