Hanyang University · Engineering
Professor Izaz Ali Shah's research lab specializes in electromagnetic compatibility, wireless power transfer, and bioelectromagnetic safety, with a strong focus on implantable medical devices and their interaction with electromagnetic fields. The lab investigates advanced antenna designs for biomedical applications, including multiband and reconfigurable antennas for implantable systems, as well as the optimization of near-field wireless power transfer for efficient and safe charging of implantable devices. A key research direction involves computational dosimetry to evaluate specific absorption rate (SAR) and induced electric fields in human models with various medical implants, ensuring safety in emerging technologies like electric vehicles and wearable systems.
Figures are computed from collected data and may differ slightly.
In this communication, a multiband spiral-shaped implantable antenna for scalp implantation and leadless pacemaker systems is presented. The proposed antenna has the following operational bands: medical implanted communication service (MICS) (402-405 MHz), industrial, scientific, and medical (ISM) (433.1-434.8 MHz and 2400-2483.5 MHz), and midfield (1520-1693 MHz). The recommended antenna system consists of two implantable devices: a flat-type scalp implantable device and a capsule-type leadless
Wireless power transfer (WPT) is a promising technology for enabling the long-term operation of advanced implantable medical devices (IMDs). This article presents a highly efficient near-field WPT system for wirelessly driven or rechargeable miniaturized IMDs, comprising an off-body transmitter (Tx), a flexible on-body mu-negative (MNG) metasurface slab, and an in-body receiver (Rx). The Rx element with dimensions 7.5 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="ht
Numerical dosimetry with regards to a resonance-based wireless power transfer (RBWPT) system for charging electric vehicles (EVs) has been conducted. The RBWPT system operating at 13.56 MHz frequency with a transferred power of 5.3 kW is placed below the center of the vehicle body. Specific absorption rate (SAR) in anatomically-based human models Duke and Ella with and without a medical implant is evaluated using four exposure scenarios (i.e., Duke and Ella models sitting in the EV without an im
This paper introduces a novel 9-shaped multiband frequency reconfigurable monopole antenna for wireless applications, using 1.6 mm thicker FR4 substrate and a truncated metallic ground surface. The designed antenna performs in single and dual frequency modes depending on switching states. The antenna works in a single band (WiMAX at 3.5 GHz) when the switch is in the OFF state. The dual band frequency mode (Wi-Fi at 2.45 GHz and WLAN at 5.2 GHz) is obtained when the switch is turned ON. The dire
One of the important safety aspects regarding electromagnetic fields is their coupling with medical implants in the human body. In this article, an adult model (Ella), with different medical implants, was exposed to a leaked magnetic field from a wireless power transfer (WPT) system in an electric vehicle, operating at a frequency of 85 kHz, with transferred powers of 3.7, 7.7, 11, and 22 kW. The induced electric field (E-field) in the human model, standing close to the vehicle and sitting insid
The interactions of medical implants in the human body with electromagnetic fields from newly introduced high-field technologies such as near-field wireless power transfer (WPT) are of great concern. In this study, the effects of implants on the specific absorption rate (SAR) in a head model were computationally evaluated in the immediate vicinity of a WPT system operating at 6.78 MHz with a transferred power of 50 W. The SAR in the head model located 30 mm above the WPT system was evaluated wit
Leadless cardiac pacemakers (LCPs) enhance health technology by offering a minimally invasive and reliable solution for cardiac pacing; however, their reliance on batteries poses a challenge to achieving extended device longevity. This study proposes an efficient wireless power transfer (WPT) system for LCP devices, in which the dynamic misalignments caused by the natural contraction and relaxation of heart muscles during cardiac cycles and respiratory movements are characterized for the first t
The CAROL ablation was very effective and safe in porcine lungs showing encouraging potential to overcome the conventional approaches.
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