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my smartphone seems to use 5 ghz

If the traffic you want to capture is on a 5GHz channel, then the capturing device needs to be on the same channel.

The device you use for capturing supports 2.4GHz band only, so you won't be able to see the eapol frames in an OTA (over the air) capture. Either change the capture adapter (i.e. get a different one) to include the band/channels you need, or try to force the device under test to use what is supported. If you turn off 5GHz, the phone will likely connect to a 2.4GHz channel. Datarates will be lower, so this might only be for a test and assumes you don't have multiple APs so the phone will connect to another AP that is still using 5GHz.