A5048794465- Antenna Design and Analysis
- Advanced Antenna and Metasurface Technologies
- Energy Harvesting in Wireless Networks
- Microwave Engineering and Waveguides
- RFID technology advancements
- Antenna Design and Optimization
- Advanced Sensor and Energy Harvesting Materials
- Wireless Power Transfer Systems
- Millimeter-Wave Propagation and Modeling
- Metamaterials and Metasurfaces Applications
- Modular Robots and Swarm Intelligence
- Nanomaterials and Printing Technologies
- Electromagnetic wave absorption materials
- Innovative Energy Harvesting Technologies
- Indoor and Outdoor Localization Technologies
- Advanced Materials and Mechanics
- Radar Systems and Signal Processing
- Radio Frequency Integrated Circuit Design
- Nanofabrication and Lithography Techniques
- Advanced Power Amplifier Design
- Wireless Body Area Networks
- Analog and Mixed-Signal Circuit Design
- Microwave and Dielectric Measurement Techniques
- Non-Invasive Vital Sign Monitoring
- Satellite Communication Systems
Pusan National University
2018-2024
Hanwha Solutions (South Korea)
2022
Qualcomm (United States)
2016
Georgia Institute of Technology
2012-2015
In this paper, various ambient energy-harvesting technologies (solar, thermal, wireless, and piezoelectric) are reviewed in detail their applicability the development of self-sustaining wireless platforms is discussed. Specifically, far-field low-power-density technology thoroughly investigated a benchmarking prototype an embedded microcontroller-enabled sensor platform has been successfully powered by ultrahigh-frequency (UHF) digital TV signal (512-566 MHz) where broadcasting antenna 6.3...
A compact dual-band rectenna operating at 915 MHz and 2.45 GHz is presented. The consists of a slot-loaded folded dipole antenna rectifier. length the proposed only 36.6% half-wavelength (λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> /2) while keeping property GHz. rectifier circuit optimized for low input power densities using harmonic balance (HB) simulation. efficiencies are evaluated with both single- dual-frequency signals....
This study presents a dual polarized broadband microstrip patch antenna for 5G mmWave module on an FR4 substrate. The proposed was fabricated using standard printed circuit board (PCB) process because of its low cost and ease mass production. electrical properties the substrate in frequency band were also characterized. An air cavity structure introduced to mitigate high loss tangent Capacitive elements such as proximity L-probe feedings parasitic patches are used improve impedance bandwidth...
In this letter, a novel electromagnetic band-gap structure (EBG) with single-ring resonators is inkjet-printed on the commercially available photo paper using conductive nano-silver ink. The printed EBG array placed above copper sheet, forming an artificial magnetic conductor (AMC) reflector at designed frequency range (2.4 ~ 2.5 GHz). A microstrip monopole antenna backed AMC and tested in free space contact human phantom. gain of conventional phantom as low -9 dBi. proposed monopole,...
Inkjet-printing is a very promising technology for the development of microwave circuits and components. conductive silver nanoparticles on an organic flexible paper substrate introduced in this study. The characterised using T-resonator method. A variety passive active devices, as well complete inkjet-printed substrates are introduced. This work includes artificial magnetic conductor structures, integrated waveguide, solar-powered beacon oscillator wireless power transfer localisation,...
Inkjet printing on flexible paper and additive manufacturing technologies (AMT) are introduced for the sustainable ultra-low-cost fabrication of radio frequency (RF)/microwave electronics sensors. This covers examples state-of-the-art integrated wireless sensor modules or polymers shows numerous inkjet-printed passives, sensors, origami, microfluidics topologies. It also demonstrates additively manufactured antennas that could potentially set foundation truly convergent ad-hoc networks...
Over the last decade, radio frequency identification (RFID) systems have been increasingly used for and object tracking due to their low-power, low-cost wireless features. In addition, explosive demand ubiquitous rugged compact sensors Internet-of-Things, ambient intelligence, biomonitoring/ quality-of-life application has sparked a plethora of research efforts integrate with an RFID-enabled platform. The rapid evolution large-area electronics printing technologies (e.g., ink-jet gravure...
The newly developed research area of inkjet-printed radio frequency (RF) electronics on cellulose-based and synthetic paper substrates is introduced in this paper. This review presents the electrical properties substrates, printed silver nanoparticle-based thin films, dielectric layers, catalyst-based metallization process. Numerous microwave passive/ative systems paper, such as a identification (RFID) tag, an RFID-enabled sensor utilizing carbon nanotubes (CNTs), substrate-integrated...
In this paper, a novel fully inkjet-printed via fabrication technology and various substrate-integrated waveguide (SIW) structures on thick polymer substrates are presented. The electrical properties of polymethyl methacrylate (PMMA) thoroughly studied up to 8 GHz utilizing the T-resonator method, inkjet-printable silver nanoparticle ink PMMA is characterized. A long process 1 mm inkjet-printing demonstrated, its characteristics presented for first time. vias 0.8-mm-thick substrate have...
This paper demonstrates the design of an 800-MHz solar-powered active wireless beacon composed antenna and integrated oscillator on a low-cost substrate. Inkjet printing is used to fabricate conductive circuit traces folded slot antenna, while designed using off-the-shelf components mounted Flexible, low-cost, amorphous silicon (a-Si) solar cells are placed top ground provide autonomous operation eliminating use battery. A prototype built characterized in terms phase noise, radiation...
This article presents an antenna structure with a reconfigurable pattern and polarization for CubeSat applications. The proposed is based on spatial-mapping origami theory consists of center-fed four-way Gysel power divider, delay lines, inside lamina emergent torsion (LET) joints, four thick planar dipole antennas. LET joints are used to distribute the mechanical stress rigid material form flexible spring structure. has monopole-like omnidirectional linearly polarized gain patterns in mode....
A RFID-based backscattering sensor system is low-cost and scalable wireless sensing technology. It takes advantage of RF energy harvesting technique, power transfer principle. also has uncountable number applications due to its versatility. In this paper, operation principle, architecture machine learning technique for wirelessly powered presented. For the tag-reading power-delivering algorithm, techniques, such as support vector (SVM), artificial neural networks (ANN), naive Bayes are...
This paper proposes a novel rhombic dual-polarized and dual-band patch antenna array design for 5G mmWave mobile devices as an antenna-in-package (AiP). The proposed consists of stacked parasitic that are designed to operate at dual frequencies (28 39GHz). An asymmetric stack-up strategy is used maximize performance within the constraints form factor. To address limitations elongated asymmetrical structures, utilized achieve dual-polarization capabilities. RF front-end module (RFFE), which...
The detailed design considerations for the printed RFID-based sensor system is presented in this paper. Starting from material selection and metallization method, paper discusses types of sensors (single- & dual-tag topologies), procedures, performance evaluation methods wireless system. electrical properties substrates (cellulose-based synthetic papers) silver nano-particle-based conductive film are thoroughly characterized RF applications up to 8 GHz. reported technology could...
This letter proposes a self-deployable circularly polarized (CP) stacked Yagi–Uda phased antenna array operating at <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">C</i> -band (5.6–6.0 GHz). The proposed system is composed of 2×2 CP and feeding networks consisting reflection-type phase shifter four-way Gysel power divider. integrated into the top side 1U (10 <inline-formula xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math...
This letter introduces the first beam splitter that acts on free-space, planar, microwave frequency waves below 80 GHz. The design utilizes a selective surface (FSS) operating away from its normal of operation. FSS is constructed an array scalable printed patterns, which allows for tenability to any fabrication method will allow. basic operation FSS, reasoning behind selecting chosen unit element and fabrication, comparison simulated measured results are discussed in detail. An...
In this paper, the far-field energy harvesting system for self-sustainable wireless autonomous sensor application is presented. The proposed consists of a power supplier (active antenna) and technology-enabled battery-less sensors. converts solar to electromagnetic in order transfer multiple sensors wirelessly. have harvesters which convert transmitted RF voltage regulated DC power-on system. hybrid printing technology was chosen build suppliers. Two popular electronics technologies (direct...
In this paper, a multi-functional transmitarray antenna consisting of miniaturized unit cells for S-band radar applications is proposed. The cell size 0.4λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × , and it composed receiving (Rx) antenna, inductively-loaded reflection-type phase shifter, PIN diode switch polarization conversion, dual-polarization transmitting (Tx) antenna. types Rx Tx antennas are coupled-fed stacked patch...
This paper presents a novel approach to address the challenges in backscatter communication for Internet of Things. The traditional use I/Q load modulator based on parametric transistor models often suffers from performance degradation due discrepancies with actual caused by thermal and environmental noise sources. To overcome this issue, proposes an active circuit modeling technique artificial neural network (ANN)-based transfer learning, which utilizes measurement data model accurately....
Abstract In this paper, the first reported waterproof inkjet-printed dual-band monopole antenna on flexible organic paper substrate is presented. The antenna, which operates at 900 MHz and 2.4 GHz, commercially available photopaper using conductive silver nano-particle ink. To protect it from ambient humidity, a 1 µm thick Parylene-C layer was deposited top of antenna. verify its capability, coated antennas were submerged in distilled water for 48 days, no significant performance degradation...
In this paper, a monopole antenna with novel nanotechnology-enabled inkjet printed electromagnetic band gap structure (EBG) is introduced for wearable biomonitoring applications minimal "on-body" performance degradation. The proposed very thin and flexible since it can be easily fabricated direct inkjet-printing on commercially available plastic or photo potentially enabling wireless sensing modules improved communication range.