| 摘要 |
The invention concerns a passive device 100 which preferably either forms part of the case of an active device 150 such as a smartphone or tablet, or is provided as a hard sticker which can be stuck to the active device. The passive device has an antenna 101 which receives a first radio frequency signal from an active device and transmits a second radio frequency signal to the active device. The passive device harvests energy 107 from the first radio frequency signal. The passive device also includes a user interface 140 comprising at least one pressure-sensitive conductor for receiving a user input. The second radio frequency signal communicates an indication of the user input. The first and second radio frequency signals are preferably in accordance with the near field communication (NFC) standard. The passive device functions as an additional user interface for the active device. |
