UHF(超高频)电子标签与 HF(高频)标签相比,具有标签体积小、读卡距离远(1～15米,与标签天线结构、读头 RF 功率以及读头天线增益有关)、读写时间快等优点。因此,越来越多的 RFID 应用工程首选 UHF 电子标签。但是,UHF 电子标签的工作频率属于分米波段,其频率的反射、折射和穿透力也比较强,对实际使用时的方向性、物品介质等有较严格的要求。 Compared with the HF (high frequency) tag, the UHF tag has a small tag size and a long reading distance (1 to 15 meters, which is related to the tag antenna structure, the RF power of the RF head, and the antenna gain of the RF antenna) Read and write time advantages. Therefore, more and more RFID applications preferred UHF RFID tags. However, the operating frequency of UHF RFID tags belongs to the decimeter band, and their reflection, refraction and penetration of frequencies are also relatively strong, which have strict requirements on the directivity and article media in actual use.