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Implantable antenna gain enhancement using liquid metal-based reflector

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Abstract

This article presents gain enhancement methodology for a dual-ring slot antenna using a frequency selective surface (FSS) as reflector. The FSS structure is formed with liquid metal placed inside the microfluidic channels created on the surface of the polydimethylsiloxane. Non-toxic liquid metal galinstain has been used to ensure biocompatibility. The FSS structure is placed below the ring slot antenna to reflect the back radiation, which in turn enhances the antenna directivity. Subsequently, the antenna gain has been increased as well. A fabricated prototype of the antenna-FSS system, operating at 2.45 GHz, has been analysed both inside human tissue mimicking fluid and pork slab to validate the simulation results. The inclusion of the liquid metal-based reflector increases antenna gain by almost 4 dB as well as ensures required biocompatibility and flexibility. Also the specific absorption rate of the antenna is observed to be reduced.

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Acknowledgements

For research support, S. Das acknowledges the Visvesvaraya Ph.D. scheme for Electronics & IT research fellowship award and D. Mitra acknowledges the Visvesvaraya Young Faculty research award, under MeitY, Govt. of India. B. Mandal and R. Augustine like to acknowledge Soft intelligence epidermal communication platform (SINTEC) project no. 824984, European Union’s Horizon 2020 and Swedish SSF project LifeSec (RIT170020).

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Authors and Affiliations

  1. Department of Electronics and Telecommunication Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, 711103, West Bengal, India

    Soumyadeep Das & Debasis Mitra

  2. Microwaves in Medical Engineering Group, Division of Solid-State Electronics, Department of Electrical Engineering, Ångström Laboratory, Uppsala University, Uppsala, Sweden

    Bappaditya Mandal & Robin Augustine

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  1. Soumyadeep Das
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Das, S., Mitra, D., Mandal, B. et al. Implantable antenna gain enhancement using liquid metal-based reflector. Appl. Phys. A 126, 738 (2020). https://doi.org/10.1007/s00339-020-03862-2

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