期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 66, 期 4, 页码 1695-1703出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2018.2804673
关键词
Conformal ingestible antennas; differentially fed antenna; ingestible capsule system; Sim4life; temperature monitoring
资金
- National Natural Science Foundation of China [61601315, 61671315]
- Natural science fund for colleges and universities in Jiangsu Province [16KJB510039]
A conformal differentially fed antenna at 915 MHz industrial, scientific, and medical (902-928 MHz) band for monitoring in body core temperature is presented in this paper. In virtue of its characteristics of ultrathin and flexible substrate, the peculiarity that proposed antenna can be wrapped around the capsule inner wall demonstrates the satisfactory performance of occupying a little space. The volume of the conformal patch antenna only measures 30 mm(3) by notching meandering slots to achieve miniaturization. The simulated impedance bandwidth (vertical bar S-11 vertical bar< -10 dB) covers from 861 to 942 MHz. The integrated capsule system, inserted in a cubic homogeneous muscle phantom for initial parametric studies and optimization, occupies the dimensions of 22 mm (length) x 11 mm (diameter). Meanwhile, the performance on the sensitivity to surrounding environment and specific absorption rate distribution are studied. In the measurements, the conformal antenna is rolled around a 3-D-printed capsule inside minced pork. The pork temperature data are monitored in time and transferred wirelessly. To confirm the system reliability, hardware circuits are designed with differential concept and a data logger is also realized to record in-time temperature data. Finally, the feasibility of system function demonstrates the suitability of the conformal differentially fed antenna in biomedical applications.
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