nRF8001 Antenna Matching Network

[Dino]

I’m using nRF8001-R2Q32-T in my design, RF Balun (part number: 2450BM14A0002T), and 2.4GHz Chip RF Antenna (part number 2450AT18A100E). My question do I still use any network (capacitor, inductor, resistor) or the Balun is taking care of that. Is that mean that i don't have to worry as long as I'm using the correct Balun

Thank you Dino

[FormerMember]

In addition to a balun, an antenna matching network is needed, to match the antenna to 50 Ohm. This tutorial, section "Matching networks" explains why it is necessary to match the antenna to 50 Ohm. The tutorial is written for nRF1, but the theory in the "Matching network" section is valid for nRF8001 as well.

[AmbystomaLabs]

That is not true, Dino specified that they are using a Johanson chip antenna which is spec'd as 9.5dB return loss without matching though a pi network is recommended to clean it up if needed.

[FormerMember]

The balun will match the chip to 50 Ohm. To achieve minimal loss, the antenna should also be matched to 50 Ohm as well. All chip antennas will need to be tuned when placed on a board that is different from the manufacturers board, because the antenna impedance depends on it's close surroundings.

[Dino]

I'll work on that Thank you for your help I really appreciate that.