In terms of operation frequency, RFID systems can be divided into four categories: lowfrequency (LF), high frequency (HF), ultra high frequency (UHF), and microwave.
根据工作频率来分,RFID系统可以分为低频,高频,超高频和微波四个波段。
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The present paper gives an analysis of the lowfrequency (LF) vortex and divergent circulation systems and their interactions in terms of the ECMWF/WMO data (summer of 1984).