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Split Ring Inspired Tri/Dual Band PIFA Antenna for Implantable Biomedical Devices

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Abstract

A multilayer concentric split ring with shoring pin implantable antenna has been presented in this paper for tri band medical applications. Initially, an antenna is evoked to resonate at MICS (402–405 MHz) band inside the homogeneous human muscle tissue, then optimized to achieve two more frequency band ISM (902–928 MHz) and WMTS (1395–1400 MHz). Three different technique; multi layering of radiating element, use of split ring with joint patches and the shortening pin based PIFA are implemented simultaneously to achieve the miniaturization with multiband feature. A novel rotation technique is adopted to achieve the target frequency, in this regard all radiating elements of antenna; short pin, split ring, joint patch is rotated around the z axis. Further the optimized antenna design is represented through a mathematical model for first target frequency. A parametric study of antenna impedance is carried out to characterize the behavior of antenna at three target frequency bands. The prototype of proposed antenna is fabricated and tested inside tissue mimicking liquid phantom. The results express the close agreement between model and measured reflection coefficient and radiation pattern. lastly, SAR safety limit value has been investigated at three desired frequency bands and the antenna has been found working at safe limit up to 2.75 mW power.

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Acknowledgements

This work was supported by the R & D Infrastructure Division, Department of Science and Technology, Government of India vide Order No. FST/ET-1/2018/157 (C) dated 14/03/2019.

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  1. Department of Electronics and Communication Engineering, Sant Longowal Institute of Engineering and Technology. Longowal, Sangrur, Punjab, 148106, India

    Rajeev Kumar, Surinder Singh & Ajay Pal Singh Chauhan

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  1. Rajeev Kumar
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  2. Surinder Singh
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  3. Ajay Pal Singh Chauhan
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Correspondence to Surinder Singh.

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Kumar, R., Singh, S. & Chauhan, A.P.S. Split Ring Inspired Tri/Dual Band PIFA Antenna for Implantable Biomedical Devices. Wireless Pers Commun 121, 687–706 (2021). https://doi.org/10.1007/s11277-021-08656-0

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