RFID has shown its potential in human-machine interaction thanks to its inherent function of identiﬁcation and relevant physical information of signals in recent years, but complex data processing and undesirable input accuracy restrict its application and promotion in practical use. This paper proposes a novel finger-controlled UHF RFID tag design for human-machine interaction. The tag antenna is based on a dipole antenna with a separated T-match structure, which is able to adjust the state of the tag by press of finger. Physical signals, the state of the proposed tag can be recognized directly by the code received by the RFID reader and no data postprocessing is needed. Therefore, the proposed tag is free from the influence of environment and suitable to be used as a wireless switch or control button in multiple scenarios. Moreover, arrays of the proposed tag with rational tag arrangements could contribute to a series of manual control devices, such as wireless keyboard, remote controller and wireless gamepad. A 3×4 array of the finger-controlled tag is presented to constitute a simple Passive RFID keyboard as an example of the applications of the proposed tag array, it refers to the arrangement of traditional mobile phone keypad and can achieve precise, convenient, quick and practical command and text input into machines by pressing the tags with fingers. Simulations and measurements of the proposed tag and tag array have been carried out to validate their performances in human-machine interaction.
- Machine interaction (HMI)
- Radio frequency identification (RFID)
- Tag antenna
- Ultra-high frequency (UHF)