The specs for the Pi 4 Model B say dual band 802.11ac but not the degree of MIMO, critical for performance. What is it. Is there provision to add external antennae?
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Am interested in the original question too. Plus further sub-questions: 1) Range with built in anntenna(e)? 2) Throughput to USB3 (application: Wireless NAS). 3) Did the RasPi engineers take precautions against the generally well known electromagnetic interferences between USB3 devices/cables and 2.4 Ghz WiFi networks, i.e. regarding PCB-design and plug-shielding? – porg Aug 26 '19 at 13:59
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Raspberry Pi 4 Model B uses the CYW43455 wireless chip, just like the Pi 3B+. The specifications indicate that it provides single-stream 11ac. There are no visible ports for external antennas.
If you require something different, you could get a better USB wireless adapter (RTL8812AU-based, for example), but that might be cost prohibitive.
Code Warrior
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Can you clarify if channel width on the Pi is limited to 20Mhz or if the 40MHz/80Mhz are enabled? I couldn't tell from the data sheet and it may have been saying it was optional. – thomasrutter Jul 10 '22 at 01:28