Ahmed Allam
YOU?
Author Swipe
View article: Sensitivity Evaluation of a Dual-Finger Metamaterial Biosensor for Non-Invasive Glycemia Tracking on Multiple Substrates
Sensitivity Evaluation of a Dual-Finger Metamaterial Biosensor for Non-Invasive Glycemia Tracking on Multiple Substrates Open
Accurate, non-invasive glucose monitoring remains a major challenge in biomedical sensing. We present a high-sensitivity planar microwave biosensor that progresses from a 2-cell hexagonal array to an 8-cell hexagonal array, and finally to …
View article: A low-cost microfluidic flow stabilizer for enhancing QCM measurement stability in in-liquid bio-applications
A low-cost microfluidic flow stabilizer for enhancing QCM measurement stability in in-liquid bio-applications Open
Quartz crystal microbalance (QCM) is a powerful sensing technique widely used in various applications, including biosensing, chemical analysis, and material science. In in-liquid applications, QCM measurements are susceptible to fluctuatio…
View article: A new SOI sensor design for detecting cancer using hybrid waveguide with higher sensitivity than both strip and slot waveguides
A new SOI sensor design for detecting cancer using hybrid waveguide with higher sensitivity than both strip and slot waveguides Open
A new highly accurate optical biomedical sensor is proposed for cancer detection characterized by high sensitivity, small footprint, low cost, and low limit of detection. The sensor is based on double-ring resonators made of silicon on ins…
View article: Design and development of a portable low-cost QCM-based system for liquid biosensing
Design and development of a portable low-cost QCM-based system for liquid biosensing Open
Quartz crystal microbalance (QCM) is a versatile sensing platform that has gained increasing attention for its use in bioapplications due to its high sensitivity, real-time measurement capabilities, and label-free detection. This article p…
View article: Improving Sensitivity of Noninvasive Blood Glucose Microwave Sensor Via Substrate Selection
Improving Sensitivity of Noninvasive Blood Glucose Microwave Sensor Via Substrate Selection Open
This research paper presents a comprehensive overview of noninvasive blood glucose detection techniques and examines the differences between substrates used in various sensing methods. The study focuses on comparing the sensitivity of sens…
View article: The Underwater Backscatter Channel: Theory, Link Budget, and Experimental Validation
The Underwater Backscatter Channel: Theory, Link Budget, and Experimental Validation Open
Underwater backscatter is a recent networking technology that enables net-zero-power communication and sensing in underwater environments. Existing research on underwater backscatter has focused on designing and demonstrating early systems…
View article: Low-temperature green synthesis of few-layered graphene sheets from pomegranate peels for supercapacitor applications
Low-temperature green synthesis of few-layered graphene sheets from pomegranate peels for supercapacitor applications Open
Graphene presents practical applications in energy storage devices, especially supercapacitors. However, mainstream synthesis of graphene includes toxic chemical usage, which threatens the environment. With the recent attention shift to sy…
View article: Enabling Long-Range Underwater Backscatter via Van Atta Acoustic Networks
Enabling Long-Range Underwater Backscatter via Van Atta Acoustic Networks Open
We present the design, implementation, and evaluation of Van Atta Acoustic Backscatter (VAB), a technology that enables long-range, ultra-low-power networking in underwater environments. At the core of VAB is a novel, scalable underwater b…
View article: Fabrication of Spiral Low-Cost Microchannel with Trapezoidal Cross Section for Cell Separation Using a Grayscale Approach
Fabrication of Spiral Low-Cost Microchannel with Trapezoidal Cross Section for Cell Separation Using a Grayscale Approach Open
Trapezoidal cross-sectional spiral microfluidic channels showed high resolution and throughput in cell separation in bio-applications. The main challenges are the complexity and high cost of the fabrication process of trapezoidal cross-sec…
View article: Piezoelectric transducer design for simultaneous ultrasonic power transfer and backscatter communication
Piezoelectric transducer design for simultaneous ultrasonic power transfer and backscatter communication Open
Ultrasonic waves can transfer power and data to sensors and devices deployed to traditionally inaccessible locations, such as inside the human body or deep in the ocean, eliminating the need for battery replacement. In ultrasonic power and…
View article: Computational Optimization of Mechanical Energy Transduction (COMET) Toolkit
Computational Optimization of Mechanical Energy Transduction (COMET) Toolkit Open
Ultrasonic transducers can be leveraged to transmit power and data through metallic enclosures such as Faraday cages for which standard electromagnetic methods are infeasible. The design of these systems features a number of variables that…
View article: Detachable Dry-Coupled Ultrasonic Power Transfer Through Metallic Enclosures
Detachable Dry-Coupled Ultrasonic Power Transfer Through Metallic Enclosures Open
Ultrasonic waves can be used to transfer power and data to electronic devices in sealed metallic enclosures. Two piezoelectric transducers are used to transmit and receive elastic waves that propagate through the metal. For an efficient po…
View article: Experimental Validation of Crosstalk Minimization in Metallic Barriers with Simultaneous Ultrasonic Power and Data Transfer
Experimental Validation of Crosstalk Minimization in Metallic Barriers with Simultaneous Ultrasonic Power and Data Transfer Open
For systems that require complete metallic enclosures, it is impossible to power and communicate with interior electronics using conventional electromagnetic techniques. Instead, pairs of ultrasonic transducers can be used to send and rece…
View article: Dual‐band CPW rectenna for low input power energy harvesting applications
Dual‐band CPW rectenna for low input power energy harvesting applications Open
A dual‐frequency band low input power rectenna is proposed in this study. The rectenna is comprised of a co‐planar waveguide (CPW) rectifier integrated with a rectangular split ring antenna loaded by a spiral strip line. A single diode ser…
View article: Design and Implementation of different unit cell elements for reflect arrays
Design and Implementation of different unit cell elements for reflect arrays Open
This paper presents the design and analysis of a unit cell reflect array element using different shapes of radiating elements. A circular split ring and a compliment split ring using different sizes of patches and substrates are proposed. …
View article: Small Frequency Ratio Multi-Band Dielectric Resonator Antenna Utilizing Vertical Metallic Strip Pairs Feeding Structure
Small Frequency Ratio Multi-Band Dielectric Resonator Antenna Utilizing Vertical Metallic Strip Pairs Feeding Structure Open
In this study a quintuple band rectangular dielectric resonator antenna (RDRA) with a small frequency ratio and small size of 30 mm × 30 mm × 9.813 mm is introduced. The proposed RDRA covers the frequency bands of WLAN (2.4/5.2 GHz), WiMAX…
View article: Independent Matching Dual-Band Compact Quarter-Wave Half-Slot Antenna for Millimeter-Wave Applications
Independent Matching Dual-Band Compact Quarter-Wave Half-Slot Antenna for Millimeter-Wave Applications Open
A dual-band mm-wave compact antenna is proposed in this paper. A quarter-wave half-slot resonator is used instead of a half-wave slot to achieve miniaturization of the antenna size. The antenna consists of two stacked half-slot resonators …
View article: High-Efficiency CMOS RF-to-DC Rectifier Based on Dynamic Threshold Reduction Technique for Wireless Charging Applications
High-Efficiency CMOS RF-to-DC Rectifier Based on Dynamic Threshold Reduction Technique for Wireless Charging Applications Open
This paper presents a high-efficiency CMOS rectifier based on an improved dynamic threshold reduction technique (DTR). The proposed DTR consists of a clamper circuit that biases the gates of pMOS diode switches through a capacitor and diod…
View article: Asymmetric wireless power transfer systems using coupled DGS resonators
Asymmetric wireless power transfer systems using coupled DGS resonators Open
This paper presents a new design for wireless power transfer (WPT) systems using asymmetric structures for the transmitter (TX) and the receiver (RX), and the TX/RX are constructed using spiral-strips defected ground structure (DGS) resona…
View article: A 12 to 24 GHz high efficiency fully integrated 0.18 µm CMOS power amplifier
A 12 to 24 GHz high efficiency fully integrated 0.18 µm CMOS power amplifier Open
This letter presents a high efficiency, and small group delay variations 12–24 GHz fully-integrated CMOS power amplifier (PA) for quasi-millimeter wave applications. Maximizing the power added efficiency (PAE), and minimizing the group del…
View article: Improved gain 60 GHz CMOS antenna with N-well grid
Improved gain 60 GHz CMOS antenna with N-well grid Open
This paper presents a novel technique to enhance Antenna-on-Chip gain by introducing a high resistivity layer below it. Instead of using the costly ion implantation method to increase resistivity, the N-well that is available in the standa…