- Energy Harvesting in Wireless Networks
- Antenna Design and Analysis
- Glaucoma and retinal disorders
- Microwave Engineering and Waveguides
- Wireless Power Transfer Systems
- Neuroscience and Neural Engineering
- Photoreceptor and optogenetics research
- Millimeter-Wave Propagation and Modeling
- Wireless Body Area Networks
- Ocular Surface and Contact Lens
- 3D IC and TSV technologies
- Proteoglycans and glycosaminoglycans research
- Advanced Sensor and Energy Harvesting Materials
- Retinal Development and Disorders
- Power Line Communications and Noise
- Semiconductor materials and devices
- Analytical Chemistry and Sensors
- Advanced MIMO Systems Optimization
- Retinal and Macular Surgery
- Semiconductor Lasers and Optical Devices
- Advanced Memory and Neural Computing
- Nitric Oxide and Endothelin Effects
Samsung (South Korea)
2015-2024
University of Suwon
2015
Purdue University West Lafayette
2010-2014
In a multiple-receiver wireless power transfer (WPT) system, determining the condition for uniform distribution at high efficiency is challenging issue. this paper, selective WPT technique using magnetic resonance coupling (MRC) introduced smart delivery in system. The proposed method selectively and exclusively delivers to only one designated receiver among multiple receivers, eliminating cross-coupling effect unbalanced division problem across receivers. This achieved by separating...
This paper presents a novel 3D packaging technique for miniature wireless biomedical sensor. The application makes the of sensor and control IC difficult challenge. It is demonstrated that thickness requirement can be met using epoxy interconnects micro-vias implemented in package to distribute signals vertically. First, layer-to-layer interconnection between silicon liquid crystal polymer (LCP) layers magnetically aligned Z-axis anisotropic conductive adhesive (ACA). resistance through ACA...
This paper presents an approach to improve the link budget in a non-line-of-sight (NLOS) path between base station (BS) and customer premises equipment (CPE) for 5G fixed wireless access (FWA) system. The oblique incidence of transmitting power into receiver is one most challenging scenarios mm-wave system with highly directive antennas. In this work, we propose application additional antenna structure attached near window such as passive repeater array which can reflect incident specific...
A planar cross-type parasitic patch array antenna has been successfully demonstrated to give tunable radiation patterns. Even with readily available commercial varactors, approximately 30 degrees of tunability is achieved. The simulated result well matched the measured result. If different varactors were used an increased capacitance range then pattern could be tuned more, however more side lobes would also introduced.
This paper presents a novel, all-Parylene, thin, flexible 3-D packaging technology with an application demonstration of wireless powering. Parylene is utilized as base substrate interposer, and multilayer thin films are conformally stacked on the substrate. High-density (450 pF/mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) metal-insulator-metal capacitors implemented ultrathin (~47 nm) deposition Parylene-N. The energy storage...
This paper presents a novel 3D packaging technique for miniature wireless biomedical sensor. The end goal of this sensor is implantation into the eye mouse, therefore size extremely limited. application makes and control IC difficult challenge. thickness unit must be less than 300 microns total. It demonstrated in that requirement can met using epoxy interconnects micro-vias implemented package to distribute signals vertically limit eventual area device. First, layer-to-layer interconnection...
This paper presents a magnetically coupled bandpass filter (BPF) approach for power distribution to multiple implanted devices. The BPF design accounts the loads and enables maximum transfer into each individual receiver given coupling coefficients between coils. proposed concept is demonstrated by showing two identical receivers below biological tissue through an external repeater on surface. In order mimic biomedical implants, test structure fabricated using 25 μm thick liquid crystal...
This paper presents the fabrication of an ultra-thin tag for identification and sensing applications in extremely small implantable regions. Particularly, we are demonstrating capability to create a telemetry system which is mouse eye. will eventually be able monitor intraocular pressure (IOP). The size eye challenges surgery integration components. Therefore, there need device biocompatible, flexible, compressible, self-expandable, thin enough implantation. demonstrates with self-expandable...
Summary form only given, as follows. This paper presents the fabrication of an ultra-thin tag for identification and sensing applications in extremely small implantable regions. Particularly, we are demonstrating capability to create a telemetry system which is mouse eye. will eventually be able monitor intraocular pressure (IOP). Telemetry with implanted inside eye established first time using 3rd order harmonic response from device.
A wireless sewer sensor network has been widespread to monitor combined overflow (CSO) causing human health and environmental hazards. To enable the interconnection between nodes, a radiator needs be embedded into manhole cover with sufficient mechanical strength. In addition, high efficiency in upper hemisphere is essential for successful communication above-ground nodes. order meet these requirements, full wavelength slot antenna shallow cavity inside cast-iron designed. An electromagnetic...
This paper presents a state-of-the-art large scale array antenna packaging technology for 5G mmwave base stations. Conventionally, antennas have been implemented in module type integrated with RFIC using low loss and high-cost PCB including all stacked layers. The structure is suitable of small size products such as mobile devices cells. However, the scheme not able to be applied station due lower yield higher cost. In this work, core techniques are proposed A6G (above 6GHz) antennas. A FPCB...
This paper shows measurement of intraocular pressure (IOP) within a mouse eye. Three main challenges faced the development device for measurement: size eye, depth anterior chamber where will be implanted, and maximum allowable incision size. These factors all limit device. In addition, novel detection scheme is required which enables changes in IOP with high resolution. presents fabrication process an ultra-small Parylene tag micro-electromechanical systems (MEMS) capacitive sensor packaged...
A novel all-Parylene based multilayer organic interposer for high-density 3D packaging is presented. The consists of both a thick 50µm Parylene substrate layer as well thin layers, down to ∼50 nm, which are formed by successive conformal thin-film deposition. processing the layers utilizes standard film techniques such photolithography, dielectric/metal deposition, and dry/wet etching. This allow excellent control over feature dimension vertically (<0.1 µm) horizontally (< 10 µm). On design...
This paper proposes a novel packaging and large-scale antenna-assembled structure for printed circuit board (PCB) that reinforces productivity, facilitates cost reduction, maintains reliability. was achieved by splitting the antenna from main it into radio-frequency integrated circuit. In addition, two innovative solutions—an externally attachable flexible PCB PCB-embedded coaxial line—are introduced to overcome degradation in performance vertical RF transition loss proposed low-cost hybrid...
Additional antenna elements are designed on the flip cover of mobile phones to boost radiation performance antennas. We used capacitive coupling technique and multi-resonant implement booster cases. The prototypes show that can make internal antennas have average efficiencies over 50%, which is difficult achieve because interferences with surrounding metal parts.
This paper presents a harmonic reflector integrated in mobile device for detection of trapped victims. With no power consumption, the module consisting an antenna and schottky diode generates second tone (2f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ) incident fundamental signal (f reflects it. Therefore, reflected is good candidate indicator location victims post-disaster situations. The based successfully commercial smart phone...
In this paper, the novel use of Parylene for implantable biomedical microsystems packaging is presented. an excellent candidate material to be used and clinically usable miniature devices due its biocompatibility, flexibility, near-hermeticity, high-density integration capability in a small form factor. Here, we propose all-Parylene technique where as package substrate, isolation layer, capacitor insulator, sealing layer. Fully-integrated embedded passive devices, transmission lines, surface...
In this paper, a novel 3D packaging technique for miniature implantable wireless biomedical sensors intraocular pressure (IOP) sensing in mice is introduced. Due to the limited size of mouse eye, sensor and control integrated circuit (IC) very challenging. The overall packaged must be less than 12 mils cubed. order achieve desired thickness, magnetically aligned Z-axis anisotropic conductive adhesive (ACA) used create vertical interconnects micro-vias material distribute signals vertically...