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This paper demonstrates fundamental evaluation results of a C-band rectifier using Si substrate for HySIC application. Usage of the Si substrate is attractive for future integration with other mixed signal circuit. Because of large loss tangent of the Si substrate, applicability as a circuit substrate to the C-band rectifier is discussed. Two types of the rectifier, conventional printed circuit board...
This paper demonstrates a UHF- and 60-GHz bands antenna with single feed structure for 5G terminal application. The single feed structure by a coaxial connector is used in the proposed antenna to be integrated with the dual-band frontend. A meander-line-antenna and a circular patch antenna is adopted for UHF- and 60-GHz-bands operation. Gains of 1.8 dBi at 795 MHz and 7.8 dBi at 62 GHz is achieved...
This paper reports on a method to measure spring constant of hydrogel microparticles by a MEMS sensor. For calculating spring constant, not only force but also displacement is necessary. The MEMS sensor consists of two sidewall doped piezoresistive cantilevers in the ranges of μΝ and μm so that both parameters can be measured simultaneously. When one cantilever pushes a target to a wall, the cantilever...
Geographically unconstrained remote control of an industrial robot for surface blending over multi-domain SDN-based optical transport networks is demonstrated, showing that cloud/edge computing technology improves controllability of the industrial robot.
We demonstrate that single-cycle intense terahertz (THz) pulses manipulate the motion of electrons in a single tunnel junction. By tuning the carrier-envelope phase of the THz pulses, the direction of the electron tunneling through the junction was coherently controlled either from the nanotip to the sample or vice versa. By analyzing the experimental data based on the Simmons model, we found that...
In this study, we have proposed an ingestible sensor platform utilizing gastric acid battery for daily healthcare. This platform has a fundamental application to precisely measure core body temperature as one of the most useful vital signs for health check. It also has the expandability to add various biosensors such as pH, pressure sensors etc‥ The architecture without a conventional battery is essential...
The adsorption behavior of heavy metals on arabica and robusta roasted coffee beans was investigated. To adsorb heavy metals, the coffee beans residues were suspended in aqueous solutions containing Cu(II) or Cd(II). Then the amount of heavy metal remaining in the solution was measured by atomic absorption spectrometry. The results show that the adsorption percentage of the heavy metal ions were above...
Based on our previous proposal of a new Ku- and S-band earth station configuration, design of radio-on-fiber (RoF) link is described. After describing the earth station scheme and device modeling for simulation, quantitative evaluations are made for frequency division multiplexing RoF link. Conversion efficiencies of the RoF link were calculated as approximately -30 dB, which are even better than...
This paper deals with experimental characterization of creepage discharge to improve the electrical characteristics of oil/pressboard (PB) composite insulation system by thin solid layer coating such as epoxy resin and Teflon on PB surface under positive standard impulse voltage (1.2/50 µs) using a rod-plane electrode arrangement in mineral oil. To evaluate the creepage discharge properties according...
Metabolism-based autofluorescence redox imaging is one of the promising options for non-invasive screening of digestive tumors. In this paper, autofluorescence from fluorescent coenzymes such as NADH and FAD related to cellular metabolism as well as total hemoglobin and oxygen saturation are analyzed based on a point spectrum. As a redox index based on the metabolism, the ratio of the 450nm-490nm...
This paper demonstrates experimental evaluation results of a wireless sensor network system inside a reusable rocket for health monitoring system. The wireless sensor node is powered by microwave power transmission (MPT) to realize completely wireless, battery-less system. Both the MPT and wireless communication use same frequency, 5.8 GHz. Time division operation is utilized for the coexistence....
In an effort to refine the value of the Boltzmann constant (k), we made thermodynamic temperature measurements of k using a Johnson noise thermometry (JNT) system, currently under development, using a quantum voltage noise source (QVNS). The JNT system measures the power spectrum density (PSD) of a sensor resistor using the PSD of a QVNS as a reference. k is then obtained using the Johnson-Nyquist...
This paper describes electrical characteristics of AlGaN/GaN high electron mobility transistors (HEMTs) with a GaN cap layer. The maximum drain current was kept constant at around 0.4 A/mm for a GaN cap layer thickness up to 5 nm. It was found that the degree of current collapse was gradually improved when the GaN cap thickness was increased from 0 (without cap) to 10 nm.
This paper describes self-assembly of Janus hydrogel microparticles, which enables to transform the assembled structures dynamically. Using a centrifuge-based microfluidic device, we fabricated Janus hydrogel microparticles encapsulating superparamagnetic materials in one side to respond to magnetic field. We succeeded in dynamic construction of structures using hydrogel microparticles and in acquiring...
This paper reports a new technique for creating controlled, three-dimensional (3D) cellular networks. The method is based on stackable photoresist structural layers realized by direct laser writing. Cells can be positioned and cultured on the layers, which are then stacked, forming 30-µm-wide cages containing the cultured cells. Cells are able to communicate from cage to cage through openings, e.g...
Pb(Zr,Ti)O3 (PZT) piezoelectric ceramics with higher Curie temperature Tc are necessary for a fabrication of better micro actuators, sensors, memories and/or piezoelectric micro electromechanical systems(MEMS). New piezoelectric materials with higher Tcbeyond PZT are extensively studied. Among the new piezoelectric materials, Bi(Me)O3-xPbTiO3 ceramics(Me: Yb, In, Sc) are fascinated for the higher...
This paper demonstrates experimental evaluation results of a wireless sensor network system inside a reusable rocket. Major requirements to realize the reusable rocket for future space development, light weight, low cost, and frequently operation such as planes. Wireless system instead of conventional wired electric system is strongly demanded. To validate effectiveness of a 920-MHz band ZigBee network...
We demonstrated a long-distance high-efficient underwater wireless charging system, which composed of a wireless power transfer antenna and a charging unit. To suppress the seawater conductor loss, which has a high conductivity of ~4 S/m, we analyzed underwater near field EM characteristics and designed dielectric-assist radiative antenna in a magnetic type. It is found that the propagation is dominantly...
We have been developing a Johnson noise thermometer (JNT) at NMIJ toward redefinition of the Boltzmann constant k. The JNT system measure thermal noise power of a resistor installed at the triple point of water and power of a reference signal generated with a Quantum Voltage Noise Source (QVNS) alternatively in order to obtain k precisely. Relative differences between experimentally obtained k and...
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