Using nRF51 Dongle antenna with nRF52810

[ashwin]

I plan on using the nRF51 Dongle meandered antenna for a design involving the nRF52810. Since the nRF52810 has an internal balun, does that mean that L1, L2, C5, C4, L3 and C6 in dongle design are all not required for my case? 

If some of them are required, why? Because I thought that only a pi matching network is required for matching the antenna (and of course C3 and L1 in the nRF5 DK design, for matching SoC Zout to transmission line). 

[Andreas]

Hi,

 

Both nRF52832 and nRF52810 do indeed have single-ended outputs, but they require two external components (see the reference circuit) for harmonic rejection and to some extent impedance matching. If you plan on backing off on output power you might be fine with only the pi network for antenna tuning, but for the higher power settings you need them. Regardless, you should always measure this on your prototypes and tune the matching network accordingly, or you risk failing regulatory tests.

 

Best regards,

Andreas