Abstract: To track and manage the medical devices, an UHF passive miniaturized RFID tag antenna applied to surgical scissors is proposed to monitor the number of surgical scissors before and after surgery. The tag antenna adopts the lumped element loading technology and shorted-circuit technology to reduce the size of the antenna. By changing the capacitance value and the dimension of the structure, the resonant frequency and the characteristic impedance of the tag antenna can be adjusted. After optimization, the final size of the proposed antenna is 6 mm × 3 mm × 1 mm. The maximum reading distance of the tag embedded in the surgical scissors is 1.2 m. The proposed antenna is fabricated and measured. The simulation and measurement results are in good agreement.