A high-efficiency rectenna element has been designed and tested at 5.8 GHz for applications involving microwave-power transmission. The dipole antenna filtering circuitry are printed on a thin duroid substrate. silicon Schottky-barrier mixer diode with low breakdown voltage is used as the rectifying device. inside waveguide simulator achieves an RF-to-DC conversion efficiency of 82% input power level 50 mW 327 /spl Omega/ load. Closed-form equations given impedance function RF power....

Abstract Diabetic wound healing is a serious, complex, and chronic process; one current promising focusing technology in this area stem cell treatment. Here, novel porous microneedle (MN) arrays fabricated, which can highly mimetic niches, through template filling, particle etching method. The human adipose‐derived cells (ADSCs) are encapsulated Matrigel then loaded into the MN by post‐perfusion. Because of extracellular matrix‐mimicking, biocompatible offers bionic microenvironment nest...

We report a numerical simulation study of gate capacitance components in tunneling field-effect transistor (TFET), showing key differences the partitioning between source and drain as compared with MOSFET. A compact model for TFET components, including parasitic inversion capacitances, was built calibrated computer-aided design data. This should be useful further investigation performance circuits containing TFETs. The dependence gate-drain C <sub...

We report the first study of effect strain on tunneling field-effect transistor (TFET) characteristics. Double-gate silicon TFETs were employed. It was found that tensile increases drain current, whereas compressive reduces current. This is attributed to strain-induced band splitting and carrier repopulation provides guidelines engineering TFETs. An elaborate dependence electrical characteristics TFET temperature also reported. observed on-state current exhibits a positive at low bias...

The uniplanar coplanar waveguide (CPW) and slotline on a dielectric substrate have many applications to MIC MMIC designs. A new reverse-phase CPW hybrid-ring coupler magic-T were developed. Experimental results showed that the has 60% bandwidth centered at 3 GHz of one octave from 2 4 with 0.4 dB amplitude imbalance 3.5/spl deg/ phase imbalance. Also, this paper presents theoretical analyses CPW-slotline transitions using transmission line models. Accurate modeling nonuniform radial stubs...

New reduced-size uniplanar magic-T and hybrid-ring coupler suitable for MIC's MMIC's have been developed using a CPW-slotline ring that is 20% smaller than comparable designs. These circuits provide good amplitude phase characteristics over broad bandwidth. Experimental results show the has 1.3 octave bandwidth centered at 4 GHz of 1.6 from 2-6 GHz. Both maximum power dividing imbalance 0.4 dB 2.5/spl deg/ imbalance. Also new de Ronde's CPW-slot directional was with performance. The even-odd...

Wound healing has been a continuous critical focus in clinical practice, posing the ongoing challenges and burdens to patients. Current attempts tend develop multi-drug loaded patches with spatial design. Herein, we present multifunctional microneedle patch that integrates different drugs into separated regions for wound treatment. The is composed of silk fibroin-methacryloyl (SilMA) as base, silver nanoparticles (AgNPs) gelatin methacryloyl (GelMA) tips vascular endothelial growth factor...

Abstract Microneedles have demonstrated valuable applications in diabetic wound management. Many endeavors are devoted to developing microneedles with well-designed structures and enhanced functions. Herein, we present an elaborate microneedle patch breathability for healing by a multi-step replication method. The consists of breathable porous supporting substrate core–shell tips involving poly (vinyl alcohol) shells loaded antimicrobial peptides (PVA@AMPs shell) crosslinked Gelma cores...

Integrated and active antennas incorporate component functions directly at the antenna terminals thereby reducing size, weight, cost of many microwave systems. Active integrated have been used for distributed oscillators in spatial quasi-optical power combining arrays, but concept can be extended to include such applications as Doppler sensors, radars, wireless communications produce compact, low-cost products. In this paper, we report that a field-effect transistor (FET) Schottky mixer...

A high efficiency rectenna element has been designed and tested at 5.8 GHz for applications involving microwave power transmission. The dipole antenna filtering circuitry are printed on a thin duroid substrate. silicon Schottky-barrier mixer diode with low breakdown voltage is used as the rectifying device; inside waveguide simulator achieves an RF to DC conversion of 82% input level 50 mW. circuit design based full-wave electromagnetic simulator.

In this work, we demonstrate by simulation and experiment that the performance of a p + Si 0.5 Ge source tunnel field-effect transistor (TFET) can be improved inserting an undoped layer between channel. The suppresses diffusion boron into channel it also forms /Ge/Si hole quantum well, leading to abrupt profile high concentration at edge. At Ge/Si heterojunction, presence compressive strain in increases valence band offset, while tensile conduction which effectively reduces barrier enhances...

All-Silicon Tunneling Field Effect Transistors (TFETs) with relatively high I <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</sub> values were fabricated by inserting an N <sup xmlns:xlink="http://www.w3.org/1999/xlink">+</sup> pocket between source and channel to achieve sharpening or steepening of the dopant profile. The source-side Dopant Profile Steepening Implant (DPSI) can be tuned engineer junction abruptness, boost lateral electric...

In this work, we demonstrate by simulation and experiment that the performance of a p+ Si0.5Ge0.5 source tunnel field-effect transistor (TFET) can be improved inserting an undoped Ge layer between channel. The suppresses diffusion boron into Si channel it also forms Si0.5Ge0.5/Ge/Si hole quantum well, leading to abrupt profile high concentration at edge. At Ge/Si heterojunction, presence compressive strain in increases valence band offset, while tensile conduction which effectively reduces...

An FET has been integrated with a cavity-enclosed inverted stripline patch antenna. This low-cost microwave source operates at 5.69 GHz an output power of 57 mW. The half-power beamwidths in the E- and H-plane patterns are 46 64°, respectively. crosspolarisation level is nearly 20 dB down from maximum.

The general theory for oscillator and mixer design is applied to develop an X-band self-mixing antenna. antenna uses a Gunn diode as the active device that provides oscillations operations. circuit slotline ring resonator frequency stabilization can be modified include varactor wide-band tuning. performance compared with theoretical results derived from simple transmission-line models. radiation patterns of are also those measured similarly configured passive Since radiated power serves...

A new concept for solid state wireless microwave power transmission is presented. 2.45 GHz rectenna element that was designed over 85% RF to DC conversion efficiency has been used oscillate at 3.3 with an approximate 1% efficiency. The radiation obtained from the same circuit by supplying output reverse polarity power.

We report on the reduction of 1/f noise current by utilizing non-equilibrium carrier transport in AlInAs/InGaAs HBTs. A 10-dB equilibrium input density is obtained reducing base thickness from 100 nm to 70 mn for transistors with emitter dimensions 3/spl times/5 /spl mu/m/sup 2/. As result, a corner frequency 1.55 kHz obtained. This lowest amongst any compound semiconductor devices reported date.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A coplanar waveguide (CPW)-fed slotline ring resonator has been developed and integrated with varactor diodes to create an electronically tunable planar resonator. The can be tuned over a 23% bandwidth from 3.03 3.83 GHz 4.5+or-1.5-dB variation in insertion loss. wider tuning range obtained for greater loss variation. is truly planar, offering ground planes center conductor on one side of the substrate which allows easy series or shunt devices. Monolithic implementation accomplished without...

A new type of active antenna appropriate for coupled Gunn oscillator driven spatial power combining arrays was developed. The uses a ring stabilized to slot antenna. circuit should be useful in communications, radar, and sensor systems.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A new uniplanar coplanar waveguide (CPW) magic-T and a reverse-phase CPW hybrid-ring coupler were developed. Both circuits provide good amplitude phase characteristics over broad bandwidth. Experimental results showed that the has one octave bandwidth from 2 to 4 GHz 60% 3.6 GHz.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

In this paper, the preparation and properties of polyvinyl alcohol (PVA)/silver nanoparticles (AgNPs) composite nanofiber mask material were studied. Firstly, PVA spinning solution was prepared, nanofibers with different mass fractions (5 wt%, 7 8 9 wt% 11 wt%) prepared by electrospinning technology. The morphology observed under electron microscope, results showed that had best morphology. AgNPs (0.02 0.03 0.04 0.05 0.06 dispersed in pure water blended to prepare PVA/AgNPs electrospinning....