nrf51822-DK with patch antenna

[peter]

Might I know the spec of the antenna which come with nrf51822-DK? is it 50Ohm?

I try to use patch antenna on the nrf51822-DK. the perform i measure not very good at all... the patch antenna I use on testing is 50 Ohm.

Any recommandation? should I fine tune the matching circuit again?

[Asbjørn]

The PCB antenna on the kit is tuned to be 50 Ohm. How have you implemented your antenna? Could you share some drawings or screen shots of what you are working on? What do you mean by it's not working very good at all? Do you test range or how are you doing the measurements?

[peter]

Attached is nRF51822-DK I got.

www.dropbox.com/.../2015-03-24 11.45.18.jpg

I would like to know if the antenna come with the EVboard (as following link) is 50Ohm. www.dropbox.com/.../2015-03-24 11.55.05.jpg

I use the phone apps to measure the RSSI The PCB Antenna I use as follow www.ti.com/.../swra117d.pdf

[Asbjørn]

Yes, it's a 50 Ohm antenna that you have there. The link to partnumber and information can be found here.

The two antennas in the two first links you used are of the same kind. So they are both 50 Ohm.