4.7 Article

Reconfigurable Dual-Band Capsule-Conformal Antenna Array for In-Body Bioelectronics

期刊

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 70, 期 5, 页码 3749-3761

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2021.3138264

关键词

Antenna arrays; Antennas; Antenna theory; Antenna radiation patterns; Dielectrics; Microstrip; Loading; Bioelectronics; biomedical telemetry; conformal array; dual-band antenna; microstrip antenna; implantable; in-body; ingestible; reconfigurable antenna; robustness

资金

  1. French Region of Brittany through the Strategie d'attractivite durable (SAD) EM-NEURO

向作者/读者索取更多资源

Efficient and robust in-body antenna designs are crucial for the development of wireless in-body bioelectronics. This study proposes a pattern- and frequency-reconfigurable capsule-conformal antenna array that addresses the challenges of next-generation in-body bioelectronics, and experimental results validate its effectiveness.
Wireless in-body bioelectronics offer powerful biosensing and therapeutic capabilities. Efficient and robust in-body antenna designs are required to ensure a reliable through-body link, increase data rates, and reduce power budgets. This study proposes and demonstrates a pattern- and frequency-reconfigurable capsule-conformal antenna array that responds to the challenges of next-generation in-body bioelectronics. The array comprises two mirrored dual-band elements operating at 434 MHz and 2.45 GHz ISM bands. Tissue-matched dielectric loading of the array improves the radiation efficiency and ensures quasi tissue-independent operation for both bands. Due to the full ground plane, the antenna is shielded from the capsule payload. The achieved efficiencies are compared to the fundamental limitations and closely approach them. The realized gains are -28.9 and -18.6 dBi at 434 MHz and 2.45 GHz, respectively, when the array is placed in the center of a o100-mm diameter spherical phantom with muscle-equivalent properties. Using a single switch, the array can be reconfigured to adjust the angular position of the nulls in the radiation pattern in both bands thereby enabling synthesis of an effectively null-free omnidirectional pattern. The array prototypes are fabricated, and the impedance and far-field radiation patterns are characterized to validate the design in tissue-equivalent liquid phantoms.

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