Antenna on Dahua Doorbell DB10

[Makinarg 1]

Hello Everyone, 

I was wondering if you could give me some advice on how to modify the following device. It is a Dahua Doorbell DB10. The range of this doorbell is very limited, which creates a lot of latency problems due to the weak wifi connection. 

Perhaps it would have been better to get an antenna extension for the WIFI router, but since I cannot drill the wall to place the antenna facing outside, this was my last option. My idea is to get a cable to solder to the places the antenna was soldered and then connect it to the antenna of a broke router or perhaps build a directional antenna.

If you could be so gentle to inform me, what materials should I use to connect the device with the new antenna:

- Cable RG? LMR? what type?

Any type of information will be much apreciated. 
 

I should weld a piece of the cable from one side to the other, and then from that same side to the antenna, correct?

 

 

Here i took apart the antenna that was inside the device.

Edited September 28, 2020 by Makinarg
modify text and arrange images

[clanon 258]

It's a PIFA antenna (low gain)...Check continuity ...but i think cable (50ohms shorter you can) goes like this

Try with a DIPOLE

Edited September 28, 2020 by clanon

[Makinarg 1]

Thank you Clanon, I just read in another post that it should be a RG-174 cable.

Now, onto welding the cable, I should weld the copper inner part to the left arrow and the mesh ( that would be ground, correct?) to the place where it is the right arrow. Did I understood it correctly?

Like in this case: 
 

OR LIKE THIS ONE:

 

right?

[clanon 258]

Yellow ring is SHIELD (GND) (careful with those hairs, make a ring with solder) RED line is inner WIRE...50ohms feed point

https://www.wifi-antennas.com/uploads/monthly_2020_09/5f714c7f94137_frontdesoldered.jpg.c2757e4d0fc1d166241bf1cbe9d605d3.jpg.7e186604399d80e2a8f10e2d24415cec.jpg

 

Edited September 29, 2020 by clanon

[Makinarg 1]

Thank you Clanon. I will do this project soon an post about it. Thank you for your help.

[clanon 258]

GND would have continuity to any of those IC EMI  SHIELDS (aluminum tin  covering circuits) that's COAXIAL SHIELD (MESH) GND...just to be sure...