A Flexible and Transparent Wearable Antenna Developed with Liquid Dielectric and Polymer

Abu Sadat Md. Sayem

doi:10.55524/ijircst.2025.13.1.16

Abstract

This article proposes the design and realisation of a conformal and transparent antenna compatible for wearable ap- plications. This new antenna utilises water, transparent polymer and conductive fabric for its design and realisation. The topology of the fabricated antenna is deformable and has broadside radiation pattern, thus, suitable for on-body applications which is validated through experimental investigations. The basic antenna comprises a monopole radiator backed by a dielectric reflector which directs the omnidirectional radiation of the monopole to broadside. The notable features of this new antenna are its excellent optical transparency, conformality, good bandwidth, gain and efficiency and the utilisation of easily accessible and bio- friendly materials. The center resonance frequency of the antenna is 2.45 GHz ISM band with 3.42 dB peak gain and 51% efficiency. The usability of the antenna for wearable applications is checked by on-phantom measurements, bending tests and investigating specific absorption rate (SAR). Due to its amazing optical transparency, structural deformability, radiation characteristics, size and ease of fabrication, this antenna is a promising candidate for flexible transparent electronic systems, including wearable body-area networks.

Keywords

Broadside, Conductive Fabric, Flexible Antennas, Monopole, Polydimethylsiloxane, Robust.

References

T. Peter, T. A. Rahman, S. W. Cheung, R. Nilavalan, H. F. Abutarboush, and A. Vilches, “A Novel Transparent UWB Antenna for Photovoltaic Solar Panel Integration and RF Energy Harvesting,” IEEE Transactions on Antennas and Propagation, vol. 62, no. 4, pp. 1844–1853, Apr. 2014. Available from: https://doi.org/10.1109/TAP.2014.2298044
W. Hong, S. Lim, S. Ko, and Y. G. Kim, “Optically Invisible Antenna Integrated Within an OLED Touch Display Panel for IoT Applications,” IEEE Transactions on Antennas and Propagation, vol. 65, no. 7, pp. 3750–3755, Jul. 2017. Available from: https://doi.org/10.1109/TAP.2017.2705127
P. Nepa and H. Rogier, “Wearable antennas for off-body radio links at VHF and UHF bands: Challenges, the state of the art, and future trends below 1 GHz,” IEEE Antennas and Propagation Magazine, vol. 57, no. 5, pp. 30–52, Oct. 2015. Available from: https://doi.org/10.1109/MAP.2015.2472374
R. B. Green et al., “Optically Transparent Antennas and Filters: A Smart City Concept to Alleviate Infrastructure and Network Capacity Challenges,” IEEE Antennas and Propagation Magazine, vol. 61, no. 3, pp. 37–47, Jun. 2019. Available from: https://doi.org/10.1109/MAP.2019.2907895
U. Ali, S. Ullah, B. Kamal, L. Matekovits, and A. Altaf, “Design, analysis and applications of wearable antennas: A review,” IEEE Access, vol. 11, pp. 14458–14486, 2023. Available from: https://doi.org/10.1109/ACCESS.2023.3243292
N. H. Abd Rahman, Y. Yamada, and M. S. Amin Nordin, “Analysis on the effects of the human body on the performance of electro-textile antennas for wearable monitoring and tracking application,” Materials, vol. 12, no. 10, p. 1636, 2019. Available from: https://shorturl.at/QXcfD
R. B. V. B. Simorangkir, Y. Yang, K. P. Esselle, and B. A. Zeb, “A method to realize robust flexible electronically tunable antennas using polymer-embedded conductive fabric,” IEEE Transactions on Antennas and Propagation, vol. 66, no. 1, pp. 50–58, Jan. 2018. Available from: https://doi.org/10.1109/TAP.2017.2772036
A. S. M. Sayem, R. B. V. B. Simorangkir, K. P. Esselle, R. M. Hashmi, and H. Liu, “A Method to Develop Flexible Robust Optically Transparent Unidirectional Antennas Utilizing Pure Water, PDMS, and Transparent Conductive Mesh,” IEEE Transactions on Antennas and Propagation, vol. 68, no. 10, pp. 6943–6952, 2020.
H. J. Song, T. Y. Hsu, D. F. Sievenpiper, H. P. Hsu, J. Schaffner, and E. Yasan, “A method for improving the efficiency of transparent film antennas,” IEEE Antennas and Wireless Propagation Letters, vol. 7, pp. 753–756, 2008.
N. Guan, H. Furuya, K. Himeno, K. Goto, and K. Ito, “A monopole antenna made of a transparent conductive film,” in 2007 International workshop on Antenna Technology: Small and Smart Antennas Metama- terials and Applications, March 2007, pp. 263–266.
G. Sun, B. Muneer, and Q. Zhu, “A study of microstrip antenna made of transparent ITO films,” in 2014 IEEE Antennas and Propagation Society International Symposium (APSURSI), July 2014, pp. 1867–1868.
A. Desai, H.-T. Hsu, B. M. Yousef, A. M. Ameen, Y.-F. Tsao, and A. A. Ibrahim, “UWB Connected Ground Transparent 4-Port Flexible MIMO Antenna for IoT Applications,” IEEE Internet of Things Journal, vol. 11, no. 7, pp. 12 475–12 484, 2024.
S. Hong, S. H. Kang, Y. Kim, and C. W. Jung, “Transparent and flexible antenna for wearable glasses applications,” IEEE Transactions on Antennas and Propagation, vol. 64, no. 7, pp. 2797–2804, July 2016.
T. Jang, C. Zhang, H. Youn, J. Zhou, and L. J. Guo, “Semitransparent and flexible mechanically reconfigurable electrically small antennas based on tortuous metallic micromesh,” IEEE Transactions on Antennas and Propagation, vol. 65, no. 1, pp. 150–158, Jan 2017.
Q. H. Dang, S. J. Chen, N. Nguyen-Trong, and C. Fumeaux, “Multi- functional reconfigurable wearable textile antennas using coplanar recon- figuration modules,” IEEE Transactions on Antennas and Propagation, vol. 71, no. 5, pp. 3806–3815, 2023.
H. Qiu, H. Liu, X. Jia, Z.-Y. Jiang, Y.-H. Liu, J. Xu, T. Lu, M. Shao, T.-L. Ren, and K. J. Chen, “Compact, Flexible, and Transparent Antennas Based on Embedded Metallic Mesh for Wearable Devices in 5G Wireless Network,” IEEE Transactions on Antennas and Propagation, vol. 69, no. 4, pp. 1864–1873, 2021.
R. B. Simorangkir, D. R. Gawade, T. Hannon, P. Donovan, S. Kumar, N. Rather, G. Moloudian, B. O’Flynn, and J. L. Buckley, “Transparent epidermal antenna for unobtrusive human-centric internet of things applications,” IEEE Internet of Things Journal, vol. 11, no. 1, pp. 1164– 1174, 2023.
A. S. M. Sayem, R. B. Simorangkir, K. P. Esselle, A. Lalbakhsh, D. R. Gawade, B. O’Flynn, and J. L. Buckley, “Flexible and transparent circularly polarized patch antenna for reliable unobtrusive wearable wireless communications,” Sensors, vol. 22, no. 3, p. 1276, 2022.
W. Zhu, X. Liu, Y. Fan, Z. Zhang, and X. Ma, “Transparent and flexible antenna with polarization reconfigurability using EGaIn for wearable applications,” IEEE Transactions on Antennas and Propagation, 2024.
F. Colombel, X. Castel, M. Himdi, G. Legeay, S. Vigneron, and E. M. Cruz, “Ultrathin metal layer, ITO film and ITO/Cu/ITO multilayer towards transparent antenna,” IET Sci., Measure. Tech., vol. 3, no. 3, pp. 229–234, May 2009.
S. Sheikh, M. Shokooh-Saremi, and M. Bagheri-Mohagheghi, “Transpar- ent microstrip patch antenna based on fluorine-doped tin oxide deposited by spray pyrolysis technique,” IET Microwaves, Antennas Propagation, vol. 9, no. 11, pp. 1221–1229, 2015.
S. Y. Lee, M. Choo, S. Jung, and W. Hong, “Optically Transparent Nano- Patterned Antennas: A Review and Future Directions,” Applied Sciences, vol. 8, no. 6, 2018. Available Online: https://www.mdpi.com/2076- 3417/8/6/901
J. Hautcoeur, F. Colombel, X. Castel, M. Himdi, and E. M. Cruz, “Radiofrequency performances of transparent ultra-wideband antennas,” Prog. in Electromag. Res. C, vol. 22, pp. 259–271, 2011.
J. Li, J. Fang, P. Xiao, J. Dong, S. Du, G. Li, and W. T. Joines, “A Fan-Shaped Compact Water Antenna With Wide Bandwidth and Op- tical Transparence,” IEEE Transactions on Antennas and Propagation, vol. 70, no. 4, pp. 3017–3021, 2022.
S. G. O’Keefe and S. P. Kingsley, “Tunability of liquid dielectric resonator antennas,” IEEE Antennas and Wireless Propagation Letters, vol. 6, pp. 533–536, 2007.
J. Yao, M. K. Chen, R. Lin, D. P. Tsai, and K.-M. Luk, “Tunable water-based meta-lens,” Advanced Optical Materials, vol. 12, no. 6, p. 2300130, 2024.
R. Zhu and J. Wang, “A Shape-Changeable Antenna Constructed by Distilled Water for Low Profile and Low Radar Cross Section Applica- tions,” IEEE Antennas and Wireless Propagation Letters, 2023.
L. Xing, Y. Huang, S. S. Alja’afreh, and S. J. Boyes, “A monopole water antenna,” in 2012 Loughborough Antennas Propagation Conference (LAPC), Nov 2012, pp. 1–4.
C. Hua and Z. Shen, “Shunt-excited sea-water monopole antenna of high efficiency,” IEEE Transactions on Antennas and Propagation, vol. 63, no. 11, pp. 5185–5190, Nov 2015.
E. Paraschakis, H. Fayad, and P. Record, “Ionic liquid antenna,” in IWAT 2005. IEEE International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, 2005., March 2005, pp. 552–554.
H. Fayad and P. Record, “Broadband liquid antenna,” Electronics Letters, vol. 42, no. 3, pp. 133–134, Feb 2006.
C. Hua, Z. Shen, and J. Lu, “High-efficiency sea-water monopole antenna for maritime wireless communications,” IEEE Transactions on Antennas and Propagation, vol. 62, no. 12, pp. 5968–5973, Dec 2014.
S. G. O’Keefe and S. P. Kingsley, “Tunability of liquid dielectric resonator antennas,” IEEE Antennas and Wireless Propagation Letters, vol. 6, pp. 533–536, 2007.
R. Zhou, H. Zhang, and H. Xin, “A compact water based dielectric resonator antenna,” in 2009 IEEE Antennas and Propagation Society International Symposium, June 2009, pp. 1–4.
R. Zhou and H. Zhang and H. Xin, “Liquid-based dielectric resonator antenna and its application for measuring liquid real permittivities,” IET Microwaves, Antennas Propagation, vol. 8, no. 4, pp. 255–262, March 2014.
M. Wang and Q. Chu, “High-efficiency and wideband coaxial dual- tube hybrid monopole water antenna,” IEEE Antennas and Wireless Propagation Letters, vol. 17, no. 5, pp. 799–802, May 2018.
J. Liang, G. Huang, K. Qian, S. Zhang, and T. Yuan, “An azimuth- pattern reconfigurable antenna based on water grating reflector,” IEEE Access, vol. 6, pp. 34 804–34 811, 2018.
Z. Hu, S. Wang, Z. Shen, and W. Wu, “Broadband polarization- reconfigurable water spiral antenna of low profile,” IEEE Antennas and Wireless Propagation Letters, vol. 16, pp. 1377–1380, 2017.
Z. Hu, Z. Shen, and W. Wu, “Reconfigurable leaky-wave antenna based on periodic water grating,” IEEE Antennas and Wireless Propagation Letters, vol. 13, pp. 134–137, 2014.
S. Wang, F. Fan, F. Zhang, Y. Li, G. Zhang, S.-W. Wong, and L. Zhu, “A frequency-reconfigurable inverted-L antenna made of pure water,” IEEE Antennas and Wireless Propagation Letters, vol. 21, no. 1, pp. 109–113, 2021.
Y. Li and K. Luk, “A water dense dielectric patch antenna,” IEEE Access, vol. 3, pp. 274–280, 2015.
J. Sun and K. Luk, “A wideband low cost and optically transparent water patch antenna with omnidirectional conical beam radiation patterns,” IEEE Transactions on Antennas and Propagation, vol. 65, no. 9, pp. 4478–4485, Sept 2017.
A. R. L. Colas, “Silicones : Preparation , Properties and Performance,” 2005.
R. B. V. B. Simorangkir, Y. Yang, R. M. Hashmi, T. Bjo¨rninen, K. P. Esselle, and L. Ukkonen, “Polydimethylsiloxane-Embedded Conductive Fabric: Characterization and Application for Realization of Robust Passive and Active Flexible Wearable Antennas,” IEEE Access, vol. 6, pp. 48 102–48 112, 2018.
R. E. Collin, Field theory of guided waves. John Wiley & Sons, 1990, vol. 5.
K. P. Thakur and W. S. Holmes, “Reflection of plane wave from multi-layered dielectrics,” in APMC 2001. 2001 Asia-Pacific Microwave Conference (Cat. No.01TH8577), vol. 2, Dec 2001, pp. 910–913 vol.2.
K. Ito, K. Furuya, Y. Okano, and L. Hamada, “Development and char- acteristics of a biological tissue-equivalent phantom for microwaves,” Electronics and Communications in Japan (Part I: Communications) banner, vol. 84, no. 4, pp. 67–77, Apr. 2001.
A. S. M. Sayem, R. B. Simorangkir, K. P. Esselle, D. N. Thalakotuna, and A. Lalbakhsh, “An electronically-tunable, flexible, and transparent antenna with unidirectional radiation pattern,” IEEE Access, vol. 9, pp. 147 042–147 053, 2021.

Cites this article as

A. S. M. Sayem "A Flexible and Transparent Wearable Antenna Developed with Liquid Dielectric and Polymer", International Journal of Innovative Research in Engineering & Management (ijircst), Vol-13, Issue-1, Page No-106-117, 2025. Available from: https://doi.org/10.55524/ijircst.2025.13.1.16

Corresponding Author

Abu Sadat Md. Sayem

Department of Electrical and Electronic Engineering, Rajshahi University of Engineering and Technology, Rajshahi 6204, Bangladesh

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