Those are the 2.4 GHz antennas, compare with the picture here:
http://forum.mikrotik.com/t/cap-ax-performance-vs-cap-ac/177572/11
Thanks for that. Any reason why Mikrotik doesn’t specify MIMO? I’m assuming a cAP ac is MIMO 2x2 for both 2.4GHz and 5GHz?
It seems like you say.
All wireless products with 802.11n support MIMO.
https://info.support.huawei.com/info-finder/encyclopedia/en/MIMO.html
Mainstream home wireless routers in the market have several antennas, each of which can transmit and receive signals. You can simply determine the values of M and N in MIMO based on the number of antennas. For example, a wireless router with four antennas can be considered a 4x4 MIMO router. The actual MIMO capabilities, of course, are subject to the product specifications. A device with more antennas provides higher performance and also costs higher.
This is true : number of chains = number of antennae
However, it does not mean that it equals the number of spatial streams. With Nstreme you can setup full duplex communications where one antenna sends and one receives. You’d have two antennas but only one spatial stream.
Outside of mikrotik, there are situations where multiple antennas are used for beamforming but not MIMO. There are also situations where multiple antennas are used for different frequencies. I have a linksys router with 8 antennas, where 4 are served by one chip and 4 by another, they are 4x4 MIMO and can use different frequencies.
Thanks for that - it’s good to completely understand the various terms.