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Many factors such as the type and the orientation of capsule antenna, the position of the capsule antenna in gastrointestinal tract, the dielectric properties of human body tissues and so on can influence the radiation characteristics of Ingestible Wireless Devices (IWDs). This paper analyses the uncertainty of the radiation characteristics of IWD and how these factors influence the performance of...
The radiation characteristics of Ingested Wireless Device (IWD) in two realistic human (male and female) body models whose dielectric values had variability up to 20% were compared. Results showed that variation of signal intensity near the surface of abdomen was less than 2.5 dB. Specific absorption rate (SAR) maximum values increased with the increment of conductivities of human body tissues and...
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...
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