Ultra-wideband just means high-frequency radio communications above 500MHz, but it now refers to two specific ideas:
UWB is a standard where devices broadcast short, low-power pulses to reveal and securely verify their location. It’s useful for item trackers, digital car keys, and to keep robots from bumping into each other.
5G UWB is a marketing term for short-range, high-speed cellular internet connections that operate at millimeter-wave frequencies.
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