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Journal Articles IEEE Transactions on Antennas and Propagation Year : 2022

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

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Abstract

Wireless in-body bioelectronics offer powerful biosensing and therapeutic capabilities. Efficient and robust inbody antenna designs are required to ensure a reliable throughbody link, increase data rates, and reduce power budgets. This study proposes and demonstrates a pattern-and frequencyreconfigurable 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. Owing 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 dBi and-18.6 dBi at 434 MHz and 2.45 GHz, respectively, when the array is placed in the center of a 100-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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Dates and versions

hal-03514459 , version 1 (06-01-2022)

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Cite

Denys Nikolayev, Anja K Skrivervik, John S Ho, Maxim Zhadobov, Ronan Sauleau. Reconfigurable Dual-Band Capsule-Conformal Antenna Array for In-Body Bioelectronics. IEEE Transactions on Antennas and Propagation, 2022, 70 (5), pp.3749-3761. ⟨10.1109/TAP.2021.3138264⟩. ⟨hal-03514459⟩
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