Better laptops tend to put the wifi antenna in the display, so it’s far away from the USB ports when in use. Obviously that’s not compatible with ultra thin laptops.
But if the antenna passes the usb port then it doesn’t really matter.
A friend of mine had a $2500 gaming laptop that couldn’t use WiFi when he used an external display. He ended up having to use two separate dongles, one for DisplayPort and another for Ethernet. It worked, but was pretty dumb. In the end, though, I was happy that at least he was using a wired connection.
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Better laptops tend to put the wifi antenna in the display, so it’s far away from the USB ports when in use. Obviously that’s not compatible with ultra thin laptops.
All laptops have their wireless antennas in the lid of the laptops. MacBooks included.
The amount of RF generated by some devices is insane.
But if the antenna passes the usb port then it doesn’t really matter.
A friend of mine had a $2500 gaming laptop that couldn’t use WiFi when he used an external display. He ended up having to use two separate dongles, one for DisplayPort and another for Ethernet. It worked, but was pretty dumb. In the end, though, I was happy that at least he was using a wired connection.
Ideally it passes by shielded. Or better yet, shield both.