A sub 1 GHz ultra miniaturized folded dipole patch antenna for biomedical applications

Abdul Rehman Chishti; Abdul Aziz; Khaled Aljaloud; Farooq A Tahir; Qammer H Abbasi; Zia Ullah Khan; Rifaqat Hussain

doi:10.1038/s41598-023-36747-4

A sub 1 GHz ultra miniaturized folded dipole patch antenna for biomedical applications

Sci Rep. 2023 Jun 19;13(1):9900. doi: 10.1038/s41598-023-36747-4.

Authors

Abdul Rehman Chishti¹, Abdul Aziz², Khaled Aljaloud³, Farooq A Tahir⁴, Qammer H Abbasi⁵, Zia Ullah Khan⁶, Rifaqat Hussain⁷

Affiliations

¹ Faculty of Engineering & Technology, The Islamia University of Bahawalpur, Bahawalpur, Pakistan. rehman.chishti@iub.edu.pk.
² Faculty of Engineering & Technology, The Islamia University of Bahawalpur, Bahawalpur, Pakistan.
³ College of Engineering, Muzahimiyah Branch, King Saud University, P.O. Box 2454, Riyadh, 11451, Saudi Arabia.
⁴ School of Electrical Engineering and Computer Science, National University of Sciences and Technology (NUST), Islamabad, Pakistan. farooq.tahir@seecs.edu.pk.
⁵ James Watt School of Engineering, University of Glasgow, Glasgow, UK.
⁶ Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, UK.
⁷ School of Electronic Engineering and Computer Science, Queen Mary University of London, London, UK.

Abstract

A miniaturized folded dipole patch antenna (FDPA) design for biomedical applications operating at sub 1 GHz (434 MHz) band is presented. Antenna is fabricated on FR-4 substrate material having dimensions of 16.40 mm [Formula: see text] 8.60 mm [Formula: see text] 1.52 mm (0.023[Formula: see text] [Formula: see text] 0.012[Formula: see text] [Formula: see text] 0.002[Formula: see text]). Indirect feed coupling is applied through two parallel strips at bottom layer of the substrate. The antenna size is reduced by 83% through lumped inductor placed at the center path of the radiating FDPA, suitable for biomedical (implantable) applications and hyperthermia. Moreover, Impedance matching is achieved without using any Balun transformer or any other complex matching network. The proposed antenna provides an impedance bandwidth of 6 MHz (431-437 MHz) below - 10 dB and a gain of - 31 dB at 434 MHz. The designed antenna is also placed on a human body model to evaluate its performance for hyperthermia through Specific Absorption Rate (SAR), Effective Field Size (EFS), and penetration depth (PD).

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Electric Impedance
Electric Power Supplies*
Fever*
Humans
Hyperthermia