RE: Using nRF51822-CFAC + BAL-NRF02D3 with flex PCB (FPC) trace antenna?

Brian — Tue, 14 Jul 2015 16:04:26 GMT

Hi Øyvind,

Thank you so much for your helpful reply! The devzone site is very helpful.

Brian

RE: Using nRF51822-CFAC + BAL-NRF02D3 with flex PCB (FPC) trace antenna?

Øyvind Karlsen — Tue, 14 Jul 2015 06:55:20 GMT

Hi Brian,

You can(and should) definitely use the reference layout as well as the general PCB design guidelines. Remember to add a matching network between your balun and the antenna. With a flex PCB you will probably see some weird effects, but you will have a functional circuit as long as you stick to the reference layout, and do your tuning well.

You should be fine using only one shunt component since you are using a PCB antenna you will be able to do a lot of your tuning by cutting the antenna to size. The idea is to cut the antenna until you reach G=1 circle then add a shunt capacitor to pull it in towards 50ohm.

Best regards,

Øyvind