An ultra-wideband (UWB) tag is a device that can be attached to objects to locate them or for other operations such as unlocking a device based on proximity to another device. Common implementations utilize at least three antennas on the device that detects a precise location of a UWB tag. This disclosure describes techniques that leverage secondary radiation caused by the metal case of a laptop (or other devices) to accurately locate a UWB tag while utilizing just two antennas, simplifying hardware design and reducing cost.
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Faraji, Kiavash, "Detecting the Direction of a UWB Anchor or Tag Using Secondary Radiation", Technical Disclosure Commons, (August 28, 2022)