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Flexible and moon-shaped slot UWB implantable antenna design for head implants

  • Roshanak Elyassi (a1) and Gholamreza Moradi (a1)


In this paper, we present a novel flexible moon-shaped slot implantable antenna for neural recording systems and head implants. It covers both medical Industrial, Scientific and Medical band (2.45 GHz) and impulse ratio ultra-wideband (IR-UWB) frequency range (3.1–10.6 GHz) for forward and backward telemetry applications. It has a simple and miniaturized structure in comparison with the antennas reported in the other researches. Furthermore, for adapting with natural curvature of human head, a flexible substrate is chosen with a good antenna performance under the bending. The proposed antenna is analyzed in a multi-layer box model of head tissues to speed up the antenna design procedures. On the basis of the simulation results, we achieved the good impedance matching over the desired frequency range (S11 below −10 dB). Far-field characteristics are considered, as well. The directivity is in suitable range for UWB short-range communications and its mean value is 3.84 dBi. Finally, to take into account patents’ safety regulations and the effective isotropic radiated power restriction in the desired frequency range, the maximum power of transmitter has been calculated. A phantom containing a mixture of sugar and water is used to test the fabricated antenna. The measured parameters are well matched to the full-wave simulation results.


Corresponding author

Corresponding author: G. Moradi Email:


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[1] Kiourti, A.; Nikita, K.S.: A review of implantable patch antennas for biomedical telemetry: challenges and solutions, antennas and propagation magazine. IEEE Antennas Propag. Mag., 54 (2012), 210228.
[2] Nikita, K.S.: Handbook of Biomedical Telemetry, Wiley–IEEE Press, Wiley, USA, 2014.
[3] Kiourti, A.; Nikita, K.S.: Miniature scalp-implantable antennas for telemetry in the MICS and ISM bands: design, safety considerations and link budget analysis. IEEE Trans. Antennas Propag., 60 (2012), 35683575.
[4] Kumar, S.A.; Shanmuganantham, T.: Implantable CPW fed circular slot antennas at 2.45 GHz ISM band for biomedical applications. J. Circuits, Systems Comput., 24 (2015), 529533.
[5] Kiourti, A.; Psathas, A.; Costa, J.R.; Fernandes, C.A.; Nikita, K.S.: Dual-band implantable antennas for medical telemetry: a fast design methodology and validation for intra-cranial pressure monitoring. Progr. Electromagn. Res., 141 (2013), 161183.
[6] Thotahewa, K.M.S.; Redoute, J.M.; Yuce, M.R.: SAR, SA, and temperature variation in the human head caused by IR-UWB implants operating at 4 GHz. IEEE Trans. Microw. Theory Tech., 61 (2013), 21612169.
[7] Bahrami, H.; Mirbozorgi, A.; Ameli, R.; Rusch, L.A.; Gosselin, B.: Flexible, polarization-diverse UWB antennas for implantable neural recording systems. IEEE Trans. Biomed. Circuits Syst., 10 (2015), 3848.
[8] Kiourti, A.; Psathas, K.A.; Nikita, K.S.: Implantable and ingestible medical devices with wireless telemetry functionalities: a review of current status and challenges. Bioelectromagnetics, 35 (2014), 115.
[9] Bahrami, H.; Gosselin, B.; Rusch, L.A.: Realistic modeling of the biological channel for the design of implantable wireless UWB communication systems, in IEEE 35th Annual Int. Conf. Engineering in Medicine And Biology Society (EMBS), San Diego, CA, 2012, 60156018.
[10] Chae, M.S.; Yang, Z.; Hoang, L.; Liu, W.: A 128-Channel 6 mW wireless neural recording IC with spike feature extraction and UWB transmitter. IEEE Trans. Neural Syst. Rehabil. Eng., 17 (2009), 312321.
[11] Borton, D.A.; Yin, M.; Aceros, J.; Nurmikko, A.: An implantable wireless neural interface for recording cortical circuit dynamics in moving primates. J. Neural Eng., 10 (2013).
[12] Lee, S.B.; Kiani, M.; Jow, U.M.; Ghavanloo, M.: An inductively powered scalable 32-channel wireless neural recording system-on-a-chip for neuroscience applications. IEEE Trans. Biomed. Circuits Syst., 4 (2010), 360371.
[13] Yuce, M.R.; Liu, W.; Chae, M.S.; and Kim, J.S.: A Wideband Telemetry Unit for Multi-Channel Neural Recording Systems, in IEEE Int. Conf. Ultra-Wideband, Singapore, 2007.
[14] Pancera, E.; Wiesbeck, W.: Fidelity based Optimization of UWB Antenna-Radiation for Medical Applications, in IEEE Int. Symp. Antennas and Propagation, Spokane, WA, 2011.
[15] Floor, P.A. et al. : In-body to on-body ultra-wideband propagation model derived from measurements in living animals. IEEE J. Biomed. Health Inf. Biomed. Health Inf., 19 (2015), 938948.
[16] Garg, R.; Bhartia, P.; Bahl, I.; Ittipiboon, A.: Microstrip Antenna Design Handbook, Artech House, USA, 2001.
[17] Chang, D.C.; Zeng, B.H.: CPW-fed circular fractal design for dual band application. IEEE Trans. Antennas Propag., 56 (2008), 20303636.
[18] Scarpello, M.L. et al. : Design of an implantable slot dipole conformal flexible antenna for biomedical application. IEEE Trans. Antennas Propag., 59 (2011), 35563564.
[19] Kumar, S.A.; Shanmuganantham, T.: Implantable CPW-fed rectangular patch antenna for ISM band biomedical applications. Microw. Opt. Technol. Lett., 56 (2014), 10601065.
[20] Leib, M.; Frei, M.; Sailer, D.; Menzel, W.: Design and Characterization of a UWB Slot Antenna Optimized for Radiation in Human Tissue, in IEEE Int. Conf. Ultra-Wideband, Vancouver, 2009.
[21] Jow, U.M.; Ghavanloo, M.: Optimization of data coils in a multiband wireless link for neuroprosthetic implantable devices. IEEE Trans. Biomed. Circuits Syst., 4 (2010), 301310.
[22] Khaleghi, A.; Balasingham, I.: Improving in-body ultra-wideband communication using near-field coupling of the implanted antenna. Microw. Opt. Technol. Lett., 51 (2009), 585589.
[23] Gabriel, S.; Lau, R.W.; Gabriel, C.: The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues. Phys. Med. Biol., 41 (1996), 22712293.
[24] Kim, J.; Rahmat-Samii, Y.: Implanted antennas inside a human body: simulations, designs, and characterizations. IEEE Trans. Microw. Theory Tech., 52 (2004), 19341943.
[25] Drossos, A.; Santomma, V.; Kuster, N.: The dependence of electromagnetic energy absorption upon human head tissue composition in the frequency range of 300–3000 MHz. IEEE Trans. Microw. Theory Tech., 48 (2000), 19881995.
[26] Khaleel, H.R.; Al-Rizzo, H.M.; Rucker, D.G.; Mohan, S.: A compact polyimide-based UWB antenna for flexible electronics. IEEE Antennas Wireless Propag. Lett., 11 (2012), 564567.
[27] Denidni, T.A.; Habib, M.A.: Broadband printed CPW-fed circular slot antenna. Electron. Lett., 42 (2006), 135136.



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