Triple-Band Transmitter with a Shared Dual-Band Antenna and Adaptive Matching for an Intraoral Tongue Drive System

This paper presents a wireless link between an intraoral Tongue Drive System (iTDS) and a nearby receiver. The iTDS is a wireless and wearable assistive technology (AT) detects tongue gestures and allows individuals with severe physical disabilities to issue a set of user-defined tongue commands to access computers, smart-phone, and navigate powered wheelchairs. To mitigate the effects of external RF interference, the Tx can switch between three transmission bands (27 MHz, 433MHz, and 915 MHz), while sharing a dual-band antenna for the upper two bands and a coil for the lower band and battery charging to reduce size. Additionally, two adaptive matching networks are incorporated with the Tx at 433 MHz and 915 MHz, respectively, to maintain robustness of wireless link in the dynamic mouth environment. The adaptive matching mechanism utilizes a feedback for auto-tuning of the antennas' matchings. The adaptive triple-band Tx chip is implemented in a 5 V 0.35-pm standard CMOS process and a combination of simulation and measurement results have been presented.

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