Joseph Costantine of AUB

Biography:

Joseph Costantine is an Associate Professor at the Electrical and Computer Engineering Department at American University of Beirut and a World Economic Forum young scientist. He received his doctorate degree from the University of New Mexico in 2009, his masters (M.E.) degree from American University of Beirut and his bachelor’s degree from the second branch of the faculty of engineering at the Lebanese University. He has 11 Provisional and Full U.S. patents. He has published so far 2 books, 1 book chapter and more than 150 Journal and conference papers. His research interests reside in reconfigurable antennas, cognitive radio, RF energy harvesting systems, antennas and rectennas for IoT devices, RF systems for biomedical devices, wireless characterization of dielectric material and deployable antennas for small satellites. He is a senior member of the IEEE since June 2019, and an associate editor for the IEEE Antennas and Wireless Propagation Letters since July 2018. He received many awards and honors throughout his career including the 2008 IEEE Albuquerque chapter outstanding graduate award, the three year (2011-2013) Air Force summer faculty fellowship with Kirtland’s space vehicles directorate in NM, USA, the 2017 first prize at the Idea-thon of international healthcare industry forum, the 2019 excellence in teaching award from American University of Beirut, the 2018 and 2020 STC Science and Technology Innovation Awards, and the 2020 distinguished young alumni award from the School of Engineering at the University of New Mexico

Address:Lebanon

Jessica Hanna- Rosette Bichara- Ahmad Jabri- Hassan Shwaykani- Fatima AlZahraa Asadallah- Mhamad Edelby- Hawraa Moghnieh

Painless, needle-free, and continuous glucose monitoring sensors are needed to enhance the life quality of diabetic patients. To that extent, we propose a highly sensitive, noninvasive continuous glycemic monitoring wearable system composed of EM front end components. The proposed sensors are validated on serum, animal tissues, and animal models of diabetes and in a clinical setting. The noninvasive measurement results during human trials reported high correlation (>0.9) between the system’s physical parameters and blood glucose levels, without any time lag. The accurate real-time responses of the sensors are attributed to their unique vasculature anatomy–inspired electromagnetic topologies.
This paper presents a new miniaturized folded patch antenna. This antenna is proposed for IoT devices’ implementation. The antenna is intended to operate at the ISM band (805-835 MHz). The miniaturized design achieves a 95 % size reduction after resorting to different size reduction techniques. These techniques include folding, slots and slits in addition to inductive loading using vias.  The antenna is fabricated and measured where measurements show good agreement with the simulated data.
In this paper, the effect of sequential rotation on the beam steering capabilities of a circularly polarized phased antenna array is analyzed. Two different topologies for a phased antenna array operating at Ka-band between 28 GHz and 40 GHz are studied where each structure is tailored to produce a maximum gain of almost 19 dB with an axial ratio below 0.5 dB. The individual elements of both topologies are dual fed with a differential phase shift of 90° respectively. This paper proves that the steering capability of a phased antenna array is doubled when sequential rotation is omitted from its feeding network.
This article presents a new method for the calculation of the dielectric constant of low-loss materials having a thickness of more than half a wavelength in the sample. The proposed method relies solely on the frequency values at which the reflection coefficient $S_{11}$ resonance occurs and does not require precalibration or shifting of the reference measurement plane from the input port to the material under test (MUT) air interface. The method is analyzed and tested for a large set of dielectric materials, where the accurate estimation of their electric permittivity is obtained. It is valid for scenarios where the MUT is inside a waveguide transmission line and can be extended to materials inserted in a transverse-electromagnetic (TEM) transmission line, such as in a coaxial cable. This method can be integrated into different sensors used for permittivity measurements of low-loss dielectrics and to provide the transition between the measured wave reflection coefficient and sample permittivity
A reconfigurable two-element Multiple Input Multiple Output (MIMO) printed inverted F antenna (PIFA) with improved isolation is proposed in this study. Three alternative reconfiguration strategies based on positive-intrinsic-negative (PIN) diodes, radio frequency micro-electromechanical switches (RF-MEMS), and varactors are used to create the MIMO antenna system. In terms of radiation characteristics, gain, power dissipated, radiation efficiency, linearity, biasing requirements, and MIMO performance, their impact on the performance of the PIFA and the MIMO system is assessed. Integration of a reconfigurable band-reject filter within the ground plane between the radiating elements improves isolation between the two MIMO antenna elements. The band-reject filter is reprogrammed at the same time as the radiating elements, resulting in less coupling and improved isolation. The MIMO system, as well as its numerous components, is built for each of the three reconfiguration strategies, and the comparison with expected data reveals a high level of agreement.
The use of machine learning to get the dimensions of antenna instead of using equations.
The design of a handset antenna has to take into account the resulting exposure of the user. Compliancy with the SAR limits is one challenge more to the antenna designer. A lot of research was done to present SAR reduction techniques for antennas. In this poster I introduce the concept of SAR, theoretical overview and some of the effective techniques to reduce it