A5028859382- Antenna Design and Analysis
- Antenna Design and Optimization
- Energy Harvesting in Wireless Networks
- Microwave Engineering and Waveguides
- Advanced Antenna and Metasurface Technologies
- Structural Analysis and Optimization
- Advanced MIMO Systems Optimization
- Wireless Body Area Networks
- Microwave and Dielectric Measurement Techniques
- Cognitive Radio Networks and Spectrum Sensing
- Radio Frequency Integrated Circuit Design
- Modular Robots and Swarm Intelligence
- Advanced Materials and Mechanics
- Wireless Power Transfer Systems
- Satellite Communication Systems
- Millimeter-Wave Propagation and Modeling
- Full-Duplex Wireless Communications
- Advanced Sensor and Energy Harvesting Materials
- Bluetooth and Wireless Communication Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Ultra-Wideband Communications Technology
- Microwave Imaging and Scattering Analysis
- Acoustic Wave Resonator Technologies
- RFID technology advancements
- Innovative Energy Harvesting Technologies
American University of Beirut
2016-2025
The Ohio State University
2023-2024
National Technical University of Athens
2023-2024
University of New Mexico
2007-2017
Space Micro (United States)
2014-2017
California State University System
2012-2015
California State University, Fullerton
2011-2014
The advancement in wireless communications requires the integration of multiple radios into a single platform to maximize connectivity. In this paper, design process reconfigurable antennas is discussed. Reconfigurable are proposed cover different services that operate over wide frequency range. They show significant promise addressing new system requirements. exhibit ability modify their geometries and behavior adapt changes surrounding conditions. can deliver same throughput as...
This communication presents a new antenna system designed for cognitive radio applications. The structure consists of UWB and frequency reconfigurable system. scans the channel to discover "white space" bands while tuning section communicate within these bands. agility is achieved via rotational motion patch. rotation controlled by stepper motor mounted on back structure. motor's LABVIEW computer connected through its parallel port. computer's port NPN Darlington array that used drive motor....
This letter details a new reconfiguration technique for implementing frequency-tunable bandpass filters. is achieved by changing the filter total capacitance via an integrated varactor within its structure. The reconfigurable then incorporated feeding line of printed antenna to form one combination allows tuning operating frequency without incorporating active components and biasing lines on radiating surface. antenna-filter combination, with filtering ability while preserving radiation...
Painless, needle-free, and continuous glucose monitoring sensors are needed to enhance the life quality of diabetic patients. To that extent, we propose a first-of-its-kind, highly sensitive, noninvasive glycemic wearable multisensor system. The proposed validated on serum, animal tissues, models diabetes in clinical setting. measurement results during human trials reported high correlation (>0.9) between system's physical parameters blood levels, without any time lag. accurate real-time...
Abstract This work introduces novel body-matched, vasculature-inspired, quasi-antenna-arrays that act as electromagnetic sensors to instantaneously, continuously, and wirelessly sense glucose variations in the bloodstream. The proposed are personalized, leverage waves, coupled with a custom machine-learning-based signal-processing module. These flexible, embedded wearable garments such socks, which provide conformity curved skin surfaces movement resilience. entire system is calibrated...
A cognitive radio front end using an optically pumped reconfigurable antenna system (OPRAS) is investigated. The scheme consists of a ultrawideband and narrowband in close proximity to one another. reconfigurability achieved by integrating laser diodes within the structure control switching state photoconductive silicon switches. This has advantage eliminating use optical fiber cables guide light switches, enables easier integration complete communication system. performance proposed...
In this paper cognitive radio is described, discussed and compared with software defined (SDR). The two types of are presented examples on both spectrum interweave underlay antenna systems detailed. Reconfigurable filtennas proposed as communicating antennas in a MIMO setting for cases radio. benefits resorting to well configuration shown herein. various designed, tested each other. Conclusions drawn based the results.
This paper discusses the fundamental principles of a cognitive-radio RF system. The key points required to achieve true device are outlined. operation system is mainly divided into two tasks. In first task, searches and identifies any part spectrum that not occupied. second task consists achieving an optimal mode communication by allocating appropriate channels be used. this paper, requirements operate detailed. Such can adopt one scenarios system: "interweave" or "underlay" operation. For...
In this letter, a new conductive composite tape-spring is proposed for CubeSat deployable antennas that constructed using glass fiber reinforced epoxy with an embedded copper alloy conductor. The bistable enabling the antenna to be elastically stable in both deployed and stowed states. A dipole designed, simulated, tested prove viability of electrical properties material.
The design process and the deployment mechanism of a quadrifilar helix antenna (QHA) conical log spiral (CLSA) are presented. two antennas proposed to operate in UHF frequency band. They composed conductors that embedded supported by innovative structural techniques. This allows efficient folding, packaging, once space. QHA beryllium copper helical arms S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> glass fiber reinforced epoxy. CLSA,...
This article presents a new compact lightweight radio frequency (RF) energy harvesting system. The system relies on dual-tapered transmission line-based matching network that stretches the rectification capability of an integrated Schottky diode. topology is demonstrated 2.4 GHz rigid with resulting power conversion efficiency reaches up to 58% over 0 dBm input RF power. Its performance compared reference rectifier typical open circuit shunt-stub network. along miniaturized monopole antenna...
This letter presents a new planar inverted-F antenna design that is dedicated for integration within mobile devices such as phones and tablets. The proposed structure based on nested capacitive slots in order to achieve multiband behavior. presented also reduced size by 60%. then reconfigured using positive-intrinsic-negative (p-i-n) diodes are embedded the structure. Frequency reconfiguration achieved ensure all various commercial required bands of interest covered. Two prototypes...
Abstract Response to environmental thermomechanical inputs in applications that range from wearable electronics aerospace structures necessitates agile communication systems driven by reconfigurable electromagnetic structures. Antennas these must dynamically preserve acceptable radiation characteristics while enabling on‐demand performance reconfiguration. However, existing reconfiguration mechanisms through stretchable conductors rely on high‐strain behavior soft substrates, which limits...
In this letter, p-i-n diodes are used as switches to connect and disconnect four patch sections a midsection of planar antenna. The antenna system is connected the field programmable gate array (FPGA) board controlling activation these switches. with incorporated designed, installed, measured. methodology for using an FPGA optimally control produce desired frequency operation presented analyzed. analogy between measured simulated results found be satisfactory. proposed can various designs...
A conical log spiral antenna is presented with a new feeding scheme. This proposed for deployment on CubeSat platform where the technique allows easier deployment. The composed of two arms that are wrapped around each other in log-periodic manner. It designed top ground plane allowing its bottom property. network quarter-wavelengths transmission lines connected to planar balun. along balun provides appropriate impedance matching and phase shift between arms. fabricated tested. measurement...
In disaster-prone areas, damaged infrastructure requires impromptu communications leveraging lightweight and adaptive antennas. Accordingly, we introduce a bi-stable deployable quadrifilar helix antenna that passively reconfigures its radiation characteristics in terms of pattern polarization. The proposed structure is composed counter-rotating helical strips, connected by rotational joints to allow simultaneous change the height radius. Each strip fiber-reinforced composite material achieve...
This paper presents a new approach for the design of multi-wideband microstrip-patch antenna. The radiating elements in this antenna are composed rectangular slots following Chebyshev distribution order 10 around center slot, and an additional triangular slot. These engraved patch, joined together one structure, fed by probe feed. A sample was analyzed, simulated, fabricated, tested. There good agreement between computed test results. can be used several applications, especially GSM domain,...
In this paper, the design and implementation of a quadrifilar helix antenna are presented where four arms 3-D printed. The structure is miniaturized by resorting to combination two approaches. first approach based on loading tips helical with circular conductive disks. size location these elements directly affect antenna's operating frequency. second miniaturization incorporating an FR-4 dielectric material into vacant space between helix. As result, length reduced ratio 43%. also designed...
This article leverages an automated quantum genetic algorithm (QGA) to design miniaturized antennas for Internet of Things (IoT) devices. The QGA implemented in this work automates the process and enables antenna designer generate static or reconfigurable microstrip folded topologies. is also a pixelation pattern within radiating surface optimally tune operation IoT communication needs as well Wi-Fi operation. In article, we present QGA-optimized both reconfiguration achieved through single...
This letter presents a new approach for the design of multiresonant printed bowtie antenna. Several techniques were attempted to obtain one antenna which is operational in 2, 3, and 5 GHz bands corresponding many wireless applications. The idea creating different slot configurations on parts single basic principle. A prototype final was fabricated tested good agreement found between simulated results.
This paper presents a new frequency reconfigurable antenna design. The reconfigurability is achieved via rotational motion of part the patch. rotating has form circle and contains four different shapes. Each shape corresponds to structure. With every rotation, structure fed in order produce set resonant frequencies. A prototype was fabricated tested prove suggested method. complete agreement found between simulated measured data.
This paper presents an antenna scheme suitable for cognitive radio applications. A UWB sensing and a frequency reconfigurable communicating are incorporated together into the same substrate. The searches available spectrum holes while simultaneously tunes its operating to corresponding determined by antenna. new technique achieve required reconfigurability is implemented via rotational motion of series patches. eliminates use any bias lines as with case RF MEMs, PIN diodes lumped elements....
A new cognitive radio antenna system is presented and discussed in this study. The composed of a wideband that used for channel sensing communicating dynamic transmission over various frequencies. software controlled reconfigurable can tune its frequency response by changing the height angular position ground plane. This rectangular patch three planes. Two planes are fixed while third one moves tilts based on user's demand. antenna's moving plane an Arduino board two linear actuators....