| 摘要 |
An electronic monitoring device (100) is configured as a mouth guard (101). The mouth guard includes a biometric sensor (106) and a communication device (107). The communication module includes an antenna (406), a controller (404); and a switch (408) operative to change a radar cross section of the antenna by selectively altering a load impedance of the antenna. The controller backscatters received radio frequency signals (415) by modulating the received radio frequency signal by controlling the switch to encode output from the biometric sensor therein. In a method (800), a coach, trainer, or parent can monitor biometric activity of a user by receiving backscattered return signals having output of the biometric sensor encoded therein. Detection of location, other biometric information, and user identification is also possible.
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