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In order to accurately estimate (build) the radio signal propagation attenuation model, especially inside the gastro-intestine (GI) tract of the human body, the Radio Frequency (RF) absorption characterization in human body is investigated. This characterization provides a criterion to design the Received Signal Strength (RSS) based localization system for the objective inside the human body. In this...
In order to assess the compliance of ingestible wireless device (IWD) within safety guidelines, the SAR, and near fields of IWD in two realistic human body models, whose dielectric values are increased from the original by ??10% and ?? 20% are studied using the finite-difference time-domain method. The radiation characteristics of the IWD in the human body models with changed and unchanged dielectric...
This paper measured the radiation characteristics of antennas inside the ingestible wireless devices (IWDs). Three monopole antennas were designed and put in two positions of the intestine of an adult female pig at the weight of 80 kg. The return losses of the antennas were measured when the pig was anesthetic and after euthanasia within one hour. The results demonstrate that the frequencies drift...
A new control strategy for the active actuation of wireless capsule endoscope has been proposed in this paper. The authors use magnetic field to implement the actuation. The external magnetic field in the three-dimensional space can be decomposed into three components, resulting in three effects on the magnet and capsule. Through analyzing the three types of force we find that two types of force are...
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