Abstract
To obviate the need for a battery or other power source, a keyboard may transmit keystroke signals to a tablet computer via a passive antenna, such as a passive Near Field Communication (NFC) antenna and/or radio-frequency identification (RFID) antenna. The tablet computer may transmit signals to the keyboard via an active antenna such as an active NFC antenna and/or RFID antenna. When the user presses a key on the keyboard, the passive antenna may modulate the signal received from the tablet computer. The modulation of the signal may include completing and/or closing a circuit in response to the user pressing the key on the keyboard. The modulation of the signal may be unique to the keystroke, and/or combination of keystrokes, entered by the user. The tablet computer may receive the modulated signal and interpret the modulated signal as the keystroke entered by the user.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Recommended Citation
Asrani, Vijay and Tanner, James, "Wireless Keyboard Without Need For Battery", Technical Disclosure Commons, (April 29, 2015)
https://www.tdcommons.org/dpubs_series/71