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nRF52xxx Safe to use Dual-Band WiFi Antenna?

Hello,

I imagine this is a pretty common and basic question but I couldn't find anything online.

Since the nRF52xxx chips are single-band 2.4GHz (and possibly sub-GHz also), is it advisable to use a Dual-Band (2.4GHz + 5GHz) WiFi Antenna as the radiator? I am concerned that there might be harmonics from 5GHz signals that could cause interference.

If it is NOT safe to use a dual-band antenna, can this problem be remedied with a SAW filter?

Thanks, Seth Berggren

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