A5008193817- Microwave Engineering and Waveguides
- Antenna Design and Analysis
- Radio Frequency Integrated Circuit Design
- Energy Harvesting in Wireless Networks
- Advancements in PLL and VCO Technologies
- Advanced Antenna and Metasurface Technologies
- Advanced Power Amplifier Design
- Photonic and Optical Devices
- Analog and Mixed-Signal Circuit Design
- Wireless Power Transfer Systems
- Electromagnetic Compatibility and Noise Suppression
- Terahertz technology and applications
- Antenna Design and Optimization
- Millimeter-Wave Propagation and Modeling
- Full-Duplex Wireless Communications
- Semiconductor Lasers and Optical Devices
- Semiconductor Quantum Structures and Devices
- Ultra-Wideband Communications Technology
- Innovative Energy Harvesting Technologies
- Advanced Photonic Communication Systems
- Wireless Body Area Networks
- Advanced MIMO Systems Optimization
- Acoustic Wave Resonator Technologies
- Superconducting and THz Device Technology
- Ferroelectric and Negative Capacitance Devices
Kyushu University
2016-2025
Integrated Systems Solutions (United States)
2001-2020
Electronics Research Institute
2019
Toshiba (South Korea)
2005-2017
Komatsu (Japan)
2017
Tokyo Institute of Technology
2012-2016
University of Yamanashi
2016
Takeda (Japan)
2016
GS Caltex (South Korea)
2013
Egypt-Japan University of Science and Technology
2013
For the first time, 4Gbit density STT-MRAM using perpendicular MTJ in compact cell was successfully demonstrated through tight distributions for resistance and magnetic properties. This paper includes results regarding parasitic control process, stack engineering. Both of successful 4Gb read write operations were performed with high TMR, low Ic. result will brighten prospect high-density STT-MRAM.
The present letter describes the design of an energy harvesting circuit on a one-sided directional flexible planar antenna. is composed antenna with impedance matching circuit, resonant and booster for converting boosting radio frequency power into dc voltage. proposed has bottom floating metal layer that enables radiation easy connection to layer. simulated output voltage 2.89 V input 100 mV 50 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This letter proposes a novel wideband rectifier circuit for RF energy harvesting. The proposed can collect signals efficiently over broad bandwidth spanning from 0.87 to 2.7 GHz which includes UHF ISM 900 MHz, GSM and 1800 wireless communication, PCS, 2.4 GHz. In order obtain sufficiently large bandwidth, matching based on high-pass type L-section lower band impedance inductive higher is proposed. constructed using voltage doubler configuration with Schottky diode SMS7630-005LF. optimized...
In this paper, the implementation of a compact, wideband, single layer, and simple RF rectifier design is discussed. The proposed configuration based on coplanar waveguide transmission line. constructed using voltage doubler circuit in conjunction with broadband matching network. To obtain small size, constituted series dual-inductive lumped element. overall dimensions are very compact 22.5 × 31 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A report is presented on the dependence of oscillation frequency antenna length in resonant‐tunnelling‐diode terahertz (THz) oscillators integrated with slot antennas. The upper limit was maximised at an optimum length. highest obtained experiment 1.55 THz for a 16 μm‐long room temperature.
This work addresses the design and implementation of a broadband differential rectifier (DR) combined with an Archimedean spiral dipole antenna (ASDA) for wireless power harvesting at low incident densities below 200 μ W/cm 2 . The proposed exhibits improved RF-DC conversion efficiency over wide frequency range from 1.2 to 5 GHz. band is associated several communication services, instance, ISM, WLAN, 5G, LTE, GPS applications. receiving planar ASDA circular polarization has average measured...
We developed a thermo-optic effect based silica optical phased array (OPA) chip and evaluated its tunability of phases lightwaves. The THz waves, whose are controlled by the OPA chip, generated from four arrayed uni-travelling-carrier photodiodes (UTC-PDs) on heterodyne photomixng. Meanwhile, UTC-PDs, which integrated with 4×4 slot antennas, fabricated monolithic InP substrate for 300-GHz wave beam combining steering. Through optoelectronic THz-wave phase control, feasibility continuous...
In this study, generating and enhancing THz continuous/pulsed waves is achieved by fabricating a monolithic InP substrate chip of arrayed photomixers, where each photomixer includes an InP/InGaAs uni-traveling-carrier photodiode (UTC-PD) with integrated 1 × 4 planar slot antennas (PSAs). Through optoelectronic time-aligned -gradient delays lightwaves that couple to the radiated yield both quantitative gain spatial directional gain. To generate continuous 300 GHz waves, UTC-PD excited at...
This paper presents an efficient wideband data recovery circuit (DRC) for forward transfer in the over-coupled mode of dynamic SWPDT systems. In mode, where operating frequency varies, conventional DRCs often become ineffective due to their limited range. To address this issue, we propose a DRC using amplitude shift keying (ASK) with on–off (OOK) modulation. The proposed also eliminates need diodes and averaging circuits, which are typically required traditional designs. achieves by passing...
We developed a metal-compatible RFID dipole antenna. The antenna consists of three layers, including the top metal, dielectric substrate, and bottom with metal shorted at side edges In order to accurately measure gain reflection coefficient (|S11|) in desired frequency band, an impedance matching circuit was created using open stub around feeding section simulation measurement results |S11| antenna’s realized are presented this paper. measured has similar characteristics design 915–940 MHz....
ABSTRACT Frequency shift keying (FSK) is a robust modulation scheme widely used in biomedical implants for wireless power and data transfer over inductive links due to its low sensitivity amplitude noise coil misalignment. However, conventional FSK faces challenges achieving high rates consumption, as it requires multiple cycles encode bits (0 or 1), limiting carrier utilization. This paper proposes novel clock recovery (CDR) that minimizes the required number of bits, improving rate...
This letter presents an excellent gain flatness CMOS power amplifier (PA) for UWB applications at 3.0-7.0 GHz in TSMC 0.18 μm technology. The PA proposed here employs a current-reused technique to enhance the upper end of desired band, shunt and series peaking inductors with resistive feedback second stage obtain wider flat gain, while shunt-shunt helps bandwidth improve output wideband matching. measurement results indicated that input return loss ( <i...
This letter proposes the design of a low group delay ultra-wideband (UWB) power amplifier (PA) in CMOS technology. The PA employs three-stage cascade common source topology that has different concept from other multi-stage to provide broad bandwidth characteristic, gain flatness , and variation . A resistive shunt feedback technique is adopted at first stage achieve good input matching, which controls upper frequency UWB system. third realizes lower corner second used smooth curve. By using...
Radio frequency (RF) power harvesting allows wireless delivery concurrently to several remote RF devices. This manuscript presents the implementation of a compact, reliable, effective, and flexible energy (EH) rectenna design. It integrates simple rectifier circuit with circularly polarized one-sided slot dipole antenna at 2.45 GHz Industrial, Scientific, Medical (ISM) band for charging operation low incident densities, from 1 95 μ W/cm 2 . The structure is printed on single layer, cost,...
Energy harvesting (EH) offers several benefits for integrating compact low-power wireless nodes into emerging microscale applications, such as the Internet of Things (IoT), wearable and implantable medical diagnosis, so on. In this study, an optimum approach is developed to design adaptive high-performance rectifier EH charging. The architecture based on a simple voltage doubler configuration. structure can be extended achieve desired output level without altering impedance matching network....
This letter presents a low phase noise quadrature ring oscillator with new start-up circuit. The architecture is two-stage differential an additional pair of transition-assistance transistors. circuit was implemented in 0.18 mum CMOS technology and the measured tuning range prototype device from 1.7 GHz to 5.5 figure merit (FOM) -162 dB. proposed area application core local multi-standard wireless transceiver.
This letter presents a new design for circularly polarized one-sided directional slot antenna with reflector metal 5.8-GHz dedicated short-range communications (DSRC) operations. Our proposed was composed of antenna, additional slots, floating layer, and metal. By optimizing the lengths widths slots in two orthogonal directions, radiation generated. In order to improve gain, some were attached on top layer bottom antenna. Moreover, an dielectric substrate connected back The total size...
Design and performance of miniaturized coplanar waveguide (CPW) bandpass filters (BPFs) using high T/sub c/ superconducting (HTS) films have been studied. In order to realize the filters, we coupled highly packed meanderline half-wavelength resonators with interdigital gaps, where admittance inverters (J inverters) were made gaps. The exact J values, susceptance slope parameters length are calculated from cascade matrix (K-matrix) scattering (S-matrix) obtained by 2.5-dimensional...
A superconducting slot antenna with broadband impedance matching circuit has been proposed and studied theoretically. In order to solve the problem of narrow bandwidths peculiar small antennas, which originates from impedance, we propose a new design theory for antenna. Using designed three stage using an electromagnetic wave simulator confirmed validity theory.
This paper describes the design of 3.1 to 4.8 GHz CMOS power amplifier (PA) for ultra-wideband (UWB) applications using 0.18-μm technology. The UWB PA proposed here employs cascode topology with a current-reused technique enhance gain at upper end desired band, an inter-stage inductor, and resistive feedback second stage obtain flatness gain. measurement results indicated that input return loss (S11) was less than -5 dB, output (S22) -8 average 10.3 dB about 0.8 dB. 1 compression point -2...