Radio frequency identification (RFID) has shown its potential in humanâ??machine\ninteraction thanks to its inherent function of identification and relevant physical information of\nsignals, but complex data processing and undesirable input accuracy restrict its application and\npromotion in practical use. This paper proposes a novel finger-controlled passive RFID tag design\nfor humanâ??machine interaction. The tag antenna is based on a dipole antenna with a separated Tmatch\nstructure, which is able to adjust the state of the tag by the press of a finger. The state of the\nproposed tag can be recognized directly by the code received by the RFID reader, and no complex\ndata processing is needed. Since the code is hardly affected by surroundings, the proposed tag is\nsuitable to be used as a wireless switch or control button in multiple scenarios. Moreover, arrays of\nthe proposed tag with rational tag arrangements could contribute to a series of manual control\ndevices, such as a wireless keyboard, a remote controller, and a wireless gamepad, without batteries.\nA 3 Ã? 4 array of the finger-controlled tag is presented to constitute a simple passive RFID keyboard\nas an example of the applications of the proposed tag array and it refers to the arrangement of a\nkeypad and can achieve precise, convenient, quick, and practical commands and text input into\nmachines by pressing the tags with fingers. Simulations and measurements of the proposed tag and\ntag array have been carried out to validate their performances in humanâ??machine interaction.
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