J. Costantine

A Ka-Band Octa-Sequentially Rotated Grid Antenna Array for Broadband Circular Polarization

Assaad I. Eid, J. Costantine, Youssef Tawk

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Volumetric Near-Field Electromagnetic Sensing of Creatinine in Urine Using a 3-D Printed Bifilar Helical Platform

Rayan AlSayed Ali, J. Costantine, Y. Tawk, Rouwaida Kanj et autres

This paper presents a microwave sensing platform for quantitative evaluation of creatinine concentration in urine using a 3D-printed bifilar helical resonant structure. The proposed sensing system integrates two conductive helices with a slotted cylindrical shell incorporating volumetric split-ring resonators, enabling enhanced confinement …

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A Miniaturized Implantable Antenna System for Localized Heating Using RF Energy

B. Hage, Y. Tawk, J. Costantine, Assaad A. Eid

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Single and Dual Helical Polarizers for Millimeter-Wave Horn Antennas

Maya Al Ajam, Y. Tawk, J. Costantine

This paper presents a helical-based polarizer integrated into the aperture of a pyramidal horn antenna, designed to convert linearly polarized radiated fields into either right-or left-handed circular polarization over two distinct bands. The integrated polarizer is entirely passive and functions as a …

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A Millimeter-Wave Dual Circularly Polarized Volumetric Antenna Array with Multi-Surface Integration

J. Costantine, Y. Tawk

This paper introduces a dual circularly polarized volumetric antenna array, leveraging a compact, integrated design for enhanced performance within the millimeter-wave range of the spectrum. The array features four radiating elements, each dual-fed with a phase difference of$\pm 9^{\circ}$, arranged on the …

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Miniaturized Wireless Implantable Antenna System for Controlled RF-Induced Heating

B. Hage, J. Costantine, Y. Tawk

This paper introduces a reliable and implantable antenna system designed to leverage wireless power transfer to induce a controlled heating effect within the human body. The system features a compact, miniaturized meandered loop antenna integrated with inductive heating circuitry via a differential …

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A Millimeter-Wave Horn Antenna with Reconfigurable Polarization

Maya Al Ajam, Y. Tawk, J. Costantine

This paper introduces the use of helical polarizing topologies within the aperture of millimeter-wave horn antennas to transform their linearly polarized fields into either right-hand or left-hand circularly polarized. The winding of the helix determines which circular polarization scheme is radiated. The …

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A 60 GHz Circularly Polarized Multilayer 16-Element Antenna Array

H. Farhat, Y. Tawk, J. Costantine, Ali Ramadan

This paper presents an antenna array that achieves circularly polarized radiation within the span of frequencies between 57.24 GHz and 64.8 GHz with a realized gain of 14.2 dBic. The presented array is composed of 16 radiating elements that are stacked on …

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Body-Responsive Electromagnetic Sensing for Future Health-Care Diagnostics: Toward new frontiers of noninvasive biomarker monitoring [Bioelectromagnetics]

Jessica Hanna, J. Costantine, Y. Tawk, Rouwaida Kanj et autres

Body-responsive sensing using electromagnetic waves transforms radio frequency-based sensors and medical devices into interactive tools that disseminate the body’s interaction with electromagnetic fields and correlate it with medical diagnostics. This sensing offers non-invasive, real-time insights into the human body, revolutionizing disease detection, …

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Wireless Continuous Glucose Monitoring Using V-Band Circularly Polarized Directive Antenna Arrays in a Transmit/Receive System

H. Farhat, J. Costantine, Y. Tawk, Rouwaida Kanj et autres

This article discusses the design of circularly polarized V-band antenna arrays for continuous and wireless blood glucose monitoring. The proposed system is designed to be integrated into earrings to sense glucose variations at a distance and without physical contact with the sensed …

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A Three-State Polarization Reconfigurable Millimeter-Wave Horn Antenna

Maya Al-Ajam, Joe Taoum, Y. Tawk, J. Costantine et autres

This paper introduces a horn antenna structure that can reconfigure its polarization between three distinct states: linear, left-handed circular polarization, and right-handed circular polarization. The reconfigurable performance is obtained across the span of frequencies between 33 GHz and 37 GHz. The on-demand …

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A Universal Flexible Back-End Circuit for Wearable Sensing Applications

Zaynab Attoun, Nader Shafi, Y. Tawk, J. Costantine

This paper presents a flexible back-end circuit that is designed to interrogate radio frequency (RF) wearable sensors and extract the magnitudes of their reflection and transmission coefficients. The seamless integration of this circuit with wearable sensors is due to its integration on …

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