This invention discloses a passive dual-feedback long-range triggered object-finding tag powered by NFC and its control method, belonging to the field of NFC
wireless power supply and smart object finding. The tag includes: a high-Q NFC magnetic
resonance coupling antenna and a
dynamic impedance matching network to achieve efficient
energy harvesting over a distance of 1-2 meters; a dual-path heterogeneous
voltage threshold adaptable power supply architecture controlled by a
voltage detection
comparator, which activates the acoustic-optical feedback unit for area positioning when the
voltage reaches 1.5V and the
Bluetooth broadcast unit for precise positioning when it reaches 2.5V; and a high-permeability ferrite magnetic shielding sheet to ensure resistance to
metal interference. This invention also discloses the corresponding control and manufacturing methods. This invention completely eliminates the need for a battery, achieving zero
standby power consumption and ultra-long lifespan, with a
total thickness that can be compressed to below 0.8mm. It is the first invention to achieve passive tag triggering and dual-mode feedback using a civilian
mobile phone's NFC at a distance of 1-2 meters, solving the core problems of existing object finders such as reliance on batteries, large thickness, and short NFC tag triggering distance.