▎ 摘　　要

NOVELTY - The tag has an antenna (3) that is arranged on the antenna substrate (1) and an radio-frequency identification (RFID) chip is electrically connected to the antenna. The loop of the antenna is covered with a phase change patch, which has a three-layer structure. The non-conductive particle phase change layer directly contacts the antenna for isolation, a conductive particle-containing phase change layer (41), and a phase change patch surface layer (43). The covering area of the phase change patch is the short-circuit area of the antenna, and the shape of the phase change layer without conductive particles (42) and the phase change layer containing conductive particles are the same. The surface area of the phase change patch surface layer is larger than that of the phase change layer containing conductive particles. The metal particles are selected from copper, nickel, and aluminum, and the non-metal particles are selected from graphene and graphite. USE - One-time passive radio-frequency identification (RFID) tag for temperature detection. ADVANTAGE - The state of the short circuit of the antenna caused by the phase change material is irreversible after the phase change, which ensures the one-time use effect and avoids the occurrence of artificial fraud. The production of the RFID tag does not changes the current production process, does not increases the processing cost of the existing tag itself, and only uses a low-priced phase change patch, which greatly reduces the manufacturing cost of the tag with the added temperature measurement function. The tag has excellent effects such as low processing and manufacturing cost, easy realization and stable monitoring state. The instantaneous high temperature interference that appears in some specific scenarios is avoided. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the cross-sectional structure of the phase change patch. Antenna substrate (1) Antenna (3) Conductive particle-containing phase change layer (41) Phase change layer without conductive particle (42) Phase change patch surface layer (43)