A5033472595- Microwave Engineering and Waveguides
- Wireless Power Transfer Systems
- Photonic and Optical Devices
- Energy Harvesting in Wireless Networks
- Analytical Chemistry and Sensors
- Wireless Body Area Networks
- Advanced MEMS and NEMS Technologies
- Semiconductor Lasers and Optical Devices
- Advanced Sensor and Energy Harvesting Materials
- Neuroscience and Neural Engineering
- Optical Network Technologies
- Gas Sensing Nanomaterials and Sensors
- Conducting polymers and applications
- Microwave and Dielectric Measurement Techniques
- Electrochemical sensors and biosensors
- Advanced Surface Polishing Techniques
- Superconducting and THz Device Technology
- Advanced Optical Network Technologies
- Antenna Design and Analysis
- Gastroesophageal reflux and treatments
- Advanced Fiber Optic Sensors
- Electrochemical Analysis and Applications
- EEG and Brain-Computer Interfaces
- Acoustic Wave Resonator Technologies
- Advanced Photonic Communication Systems
Southern Methodist University
2019-2025
University of Washington Bothell
2020
University of California, Irvine
2020
The University of Texas at Arlington
2010-2019
Alpha Omega Electromagnetics (United States)
2019
North Carolina Central University
2019
Institute of Electrical and Electronics Engineers
2018-2019
South China University of Technology
2019
Universitat Politècnica de Catalunya
2018
Northrop Grumman (United States)
2018
The need for advanced materials in emerging technologies such as tissue engineering has prompted increased research to produce novel biodegradable polymers elastic nature and mechanically compliant with the host tissue. We have developed a soft elastomeric platform biomaterial created from citric acid, maleic anhydride, 1,8-octanediol, poly(octamethylene maleate (anhydride) citrate) (POMaC), which is able closely mimic mechanical properties of wide range biological tissues. POMaC features...
In this study, a device for gastroesophageal reflux disease (GERD) monitoring has been prototyped. The system consists of an implantable, batteryless and wireless transponder with integrated impedance pH sensors; wearable, external reader that wirelessly powers up the interprets transponded radio-frequency signals. implant total size 0.4 cm ×0.8 ×3.8 harvests radio frequency energy to operate dual-sensor load-modulation circuitry. can store data in memory card and/or send it base station...
This paper presents design and optimization methods for spiral coils utilized wireless power transfer in medical implant applications. A theoretical model was examined near-field distributions of spiral-type transmitter antennas both orthogonal components. Finite-element simulations were performed to verify the radiation patterns. Receiver antenna voltages measured at planes interest as a means map field distributions. Theoretical, simulation, experimental results conducted free space they...
This paper presents a holistic and authoritative review of the role microwave technologies in enabling new generation wearable devices. A human-centric Internet Things (IoT) covering remote healthcare, distributed sensing, consumer electronics, calls for high-performance devices integrated into clothing, which require interdisciplinary research efforts to emerge. Microwaves, "interconnect" wireless networks, can enable, rather than solely connect, next autonomous, sustainable,...
Advances and updates in medical applications utilizing microwave techniques technologies are reviewed this paper. The article aims to provide an overview of enablers for their recent progress. emphasis focuses on the microwaves, following order, 1) signal data communication implants wearables through human body, 2) electromagnetic energy transfer tissues, 3) noninvasive, remote or <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">in situ</i>...
The feasibility of applying patch antennas for strain measurement is investigated. resonance frequency a antenna determined by the size its metallic patch. An applied changes dimensions patch, resulting in shift resonant frequency. Therefore, strains can be measured from A dual-frequency was designed and fabricated using conventional photolithography techniques. application evaluated bonding to an aluminum cantilever beam loads at free end beam. shifts return loss S11 curves under were...
We present a new method, suitable for food quality management by wirelessly monitoring pH level changes in with flexible sensor embedded batteryless radio-frequency (RF) transponder. The wireless tag includes based on miniature iridium oxide (IrO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</sub> ) and silver chloride (AgCl) sensing electrodes integrated deformable substrate, communication circuitry. reader system is designed to achieve...
In this letter, we developed an integrated neural probe prototype for optogenetic stimulation by microscale light-emitting diode (μLED) and simultaneous recording of activities with microelectrodes on a single-polyimide platform. Optogenetics stimulates in vivo circuits high-cellular specificity achieved genetic targeting precise temporal resolution interaction light-gated ion channels optical beam. our newly optrode probe, during neurons, continuous sensing neuronal vicinity the activation...
In this paper, we investigated the effect of power combining and delivering in multiinput multioutput wireless energy transmission systems, which consist more than one transmitter antennas as sources receiver loads repeaters. Theoretical expressions were developed to model system operation that can be a large-scale network architecture. System characteristics, such transfer between antennas, losses induced each antenna, efficiency, coil misalignment, fluctuation due loss frequency...
The electrical properties of biological cells, tissues, and organs studied in electrophysiology not only provide information about the normal/abnormal activities human bodies but also a means to directly restore, repair, replace, or recreate physiological functions humans improve quality life. For example, cardiac pacemakers, implanted millions patients, deliver pulses into right atrium and/or right/both ventricles control abnormal heart rhythms. Electrical neurons such as action potentials...
Providing energy to Internet of Things (IoT) apparatuses is ever more challenging. Humans are increasingly invested in the revolutionary new scenario that experts call <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Industry 4.0</i> , where billions electronic devices interconnected with one another. The operations battery charging or replacement for these will soon become infeasible. As a consequence, radiative wireless power transfer (WPT)...
A new architecture for microelectromechanical system (MEMS) reconfigurable Vee-antennas was presented. The planar antenna structure can be dynamically reconfigured to steer the radiation beam or change shape of using electrically-controlled microactuators. theoretical and experimental patterns were investigated a 17.5-GHz MEMS Vee-antenna. steering shaping capabilities also demonstrated.
Monitoring of structural health plays a crucial role in condition-based maintenance and degradation prediction infrastructures. In this paper, we developed novel interdigitated capacitive (IDC) strain sensor which could be integrated wireless monitoring system for (SHM) applications. The IDC sensors were fabricated by laser-micromachining 127-μm-thick brass sheet followed encapsulation deformable thermoset polymers. was implemented using commercial module (eZ430-RF2500 from Texas...
A 100-element 10-GHz grid amplifier has been developed. The active devices in the are chips with heterojunction-bipolar-transistor (HBT) differential pairs. metal pattern was empirically designed to provide effective coupling between HBTs and free space. Two independent measurements, one focusing lenses other without, were used characterize grid. In each case, peak gain 10 dB at GHz a 3-dB bandwidth of 1 GHz. input output return losses better than 15 maximum power 450 mW, minimum noise...
We report an electronically switchable dielectric leaky wave antenna. The main beam angle can be steered using p-i-n diodes. diodes are used as switches to control the radiation from two sets of gratings with different periods, thereby switching angle. Beam steering is achieved at a single fixed frequency; no frequency sweeping necessary. A microwave prototype demonstrates 35/spl deg/ change in direction 3.5 GHz. Measured antenna patterns agree theoretical predictions. This approach should...
Abstract Biomimetic scaffolds that replicate the native architecture and mechanical properties of target tissues have been recently shown to be a very promising strategy guide cellular growth facilitate tissue regeneration. In this study, porous, soft, elastic crosslinked urethane‐doped polyester (CUPE) engineered nerve guides were fabricated with multiple longitudinally oriented channels an external non‐porous sheath mimic endoneurial microtubular epineurium structure, respectively. The...
Although safe and efficacious coronavirus disease-2019 (COVID-19) vaccines are available, real protective immunity is revealed by the serum COVID-19 neutralizing antibody (NAb) concentration. NAbs deactivate virus attaching to viral receptor-binding domain (RBD), which interacts with angiotensin-converting enzyme 2 (ACE2) on human cell. This paper introduces inexpensive, rapid, sensitive, quantifiable impedance-based immunosensors evaluate NAb. The sensor limit of detection experimentally...
A flexible pH sensor based on using iridium oxide (IrOx) as the sensing film was developed by roll-to-roll (R2R) process. The inert and biocompatible properties of IrOx make it a desired metal for pH-sensing applications. substrates being continuously processed R2R technique provides advantages scalability, reconfigurability, resiliency, on-demand manufacturing, high throughput, without need vacuum systems. Potential sweeps cyclic voltammetry across against commercial planar Ag/AgCl...
Iridium oxide pH sensing film is demonstrated with wide pH-sensing ranges, high durability, and small drifts in potentials. Using sol-gel process, a lower fabrication cost less labor-intensive method, to deposit iridium thin films for reported previously by our group expected advantages. In this paper, we fabricate test characteristics of 4 × anhydrous thin-film electrode arrays on flexible substrates. The sensors exhibit Nernstian potential responses the range 57.0-63.4 mV/pH. Stability,...
Flexible iridium oxide (IrOx)-based micro-electrodes were fabricated on flexible polyimide substrates using a sol-gel deposition process for utilization as integrated pseudo-reference electrodes bio-electrochemical sensing applications. The fabrication method yields reliable miniature on-probe IrOx with long lifetime, high stability and repeatability. Such sensors can be used long-term measurements. Various dimensions of including 1 mm × mm, 500 µm µm, 100 fabricated. Sensor longevity pH...
This paper presents the simulation and experimental work that proved feasibility of using a patch antenna for strain measurement. A antenna, besides serving as data transmitting device, can function transducer directly encodes experienced into its resonant frequency. Printed on flexible substrate, sensor is small in size, has low profile be conformal to any attached surface. The technique interrogating wireless non-contact method also demonstrated. Without needing electric wiring power...