Examination of Impedance Response of Capsule-Integrated Antennas Through Gastrointestinal Tract
Résumé
This work focuses on the investigation of the degree of possible detuning that may be observed in the impedance response of ingestible antennas during the transition through the gastrointestinal tract. For this investigation, two fundamental antennas are used: a meandered dipole antenna and a meandered loop antenna. The antennas conform to the inner surface of the biocompatible capsule shell. They are optimized in spherical homogeneous time-averaged gastrointestinal phantoms to operate at 3 different frequencies of interest: 434 MHz, 1.4 GHz, and 2.4 GHz, resulting in 6 different designs in total. Next, the optimized antennas are simulated in 3 different phantoms, each mimicking the electromagnetic properties of one of the tissues in the gastrointestinal tract (stomach, small intestine, and large intestine). The impedance response of each design in 4 different tissues is compared and discussed. The results show that the maximum shift in the operating frequency of the antennas is 7 MHz, indicating that the presence of the encapsulation layer makes the considered antennas robust against the changes in the electromagnetic properties encountered through the gastrointestinal tract.
Domaines
Sciences de l'ingénieur [physics]
Fichier principal
Examination_of_Impedance_Response_of_Capsule-_Integrated_Antennas_Through_Gastrointestinal_Tract.pdf (924.93 Ko)
Télécharger le fichier
Origine | Fichiers produits par l'(les) auteur(s) |
---|