Title :
In Situ Characterization of Two Wireless Transmission Schemes for Ingestible Capsules
Author :
Wang, Lei ; Drysdale, Timothy D. ; Cumming, David R S
Author_Institution :
Univ. of Glasgow, Glasgow
Abstract :
We report the experimental in situ characterization of 30-40 MHz and 868 MHz wireless transmission schemes for ingestible capsules, in porcine carcasses. This includes a detailed study of the performance of a magnetically coupled near-field very high-frequency (VHF) transmission scheme that requires only one eighth of the volume and one quarter of the power consumption of existing 868-MHz solutions. Our in situ measurements tested the performance of four different capsules specially constructed for this study (two variants of each transmission scheme), in two scenarios. One mimicked the performance of a body-worn receiving coil, while the other allowed the characterization of the direction-dependent signal attenuation due to losses in the surrounding tissue. We found that the magnetically coupled near-field VHF telemetry scheme presents an attractive option for future, miniturized ingestible capsules for medical applications.
Keywords :
UHF radio propagation; VHF radio propagation; biomagnetism; biomedical telemetry; biosensors; UHF radio propagation; VHF radio propagation; VHF telemetry; biomedical telemetry; biosensor; body-worn receiving coil; direction-dependent signal attenuation; frequency 30 MHz to 40 MHz; frequency 868 MHz; in situ measurements; ingestible capsules; magnetically coupled telemetry; magnetically coupled transmission; near-field telemetry; near-field very high-frequency transmission; porcine carcasses; power consumption; tissue losses; wireless transmission; Attenuation; Couplings; Energy consumption; Finite difference methods; Frequency; Gastrointestinal tract; Humans; Telemetry; Temperature measurement; Time domain analysis; Biomedical telemetry; UHF radio propagation; VHF radio propagation; finite-difference time- domain ( FDTD) methods; Animals; Capsules; Eating; Electronics; Equipment Design; Equipment Failure Analysis; Swine; Telemetry;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.2007.895105