The 3D printing technology is catching attention nowadays. It has certain advantages over the traditional fabrication processes. We give a chronical review of from time it was invented. This also been used to fabricate millimeter-wave (mmWave) and terahertz (THz) passive devices. Though promising results have demonstrated, challenge lies in tolerance improvement such as dimensional surface roughness. propose design methodology high order device circumvent suggest specific modelling roughness...

In this letter, the design and performance of a Ka-band 5-b monolithic microwave integrated circuit phase shifter is presented. 180° bit, developed switched-path-type topology employed in order to extend bandwidth achieve good shifting characteristics. The fabricated demonstrates an rms error less than 4.7° amplitude 0.6 dB over frequency band from 31 40 GHz. input output return loss measured be better 9 dB, chip size 2.55 mm × 1.3 mm.

To make downstream dc-dc converters compatible with both single and three phases PFC stages for system integration, a novel three-level full bridge resonant converter was proposed. This combines the LLC topology, which maintains merits as ZVS all primary side main switches ZCS secondary diodes under wide range inputs, technique, is suitable high voltage input applications, together. In addition, configuration endows power capability to proposed converter. The detail operation principles,...

A mechanically foldable and stretchable filter with stable filtering performance is presented in this letter. The manufactured liquid metal injected into microfluidic channels, which are realized material of polydimethylsiloxane using soft lithography. elastic dielectric enable the deformation capability mechanical stability along any direction. Frequency response, insertion loss, return loss bended stretched filters investigated compared their original state through simulations experiments....

A tri‐band superconducting filter at L‐band comprising three high‐pole single‐band sub‐filters with sharp band‐edges is presented to meet the high selectivity requirement. Matching junctions high‐impedance branch lines are used connect and reduce channel interactions. MgO LaAlO 3 substrates utilised in design fabrication procedure size achieve a performance. The whole has compact of 43 × 39.1 mm, measured results match well simulations.

Water content measurement of municipal solid waste (MSW) is critical to water balance analysis landfill, leachate collection and recirculation, acceleration MSW degradation. Time domain reflectometry (TDR) commonly applied soils for the content. Application TDR methods moisture in difficult, because a heterogeneous highly conductive material. This study investigated application surface reflection method determination apparent dielectric constant MSW. A series experiments were conducted...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A compact superconducting ultra-wideband filter with a passband from 125 to 260 MHz is demonstrated. The consists of ten shunt short-circuited stubs separated by connecting lines. are grounded via grounding strip that attached the box wall number SiAl bonding wires. realized on two 2 in <formula formulatype="inline"> <tex Notation="TeX">${\rm YBCO/LaAlO}_{3}$</tex></formula> substrates, which...

This article presents a liquid-metal Galinstan alloy bandpass filter (BPF) with good flexibility, which is fabricated by an improved soft lithography process. The enclosed in the microfluidic channels of elastomeric polydimethylsiloxane (PDMS) substrates. Together PDMS substrates, based features bending, twisting and stretching capabilities along any direction. A second-order open-loop resonator 2.4 GHz center frequency 15% fractional bandwidth was designed to verify this concept....

In view of the fact that conventional millimeter wave fuze antenna cannot meet requirements miniaturization, high gain and specific direction pointing in a single antenna, microstrip beamforming array is designed. The made an alumina thin film dielectric plate as substrate, size shape etched on surface. Experimental tests show center frequency 34.5GHz, reflection parameter S11 less than -10dB 1GHz bandwidth at 34.02-35.05GHz. diameter 16mm, which 50% smaller size. beam width 36°, angle...

To overcome the duty ratio limitation issue existing in dual switch forward converter (DSFC) and improve efficiency, a novel resonant reset asymmetrical DSFC was proposed, which, compared with former DSFCs, maintains advantage of lowering voltage stress on each switch, at same time, possesses merits as can exceed 50% conventional PWM operation capability. In addition, ZVS transition for all switches under conditions is achieved while auxiliary circuit comparatively simple cost effective: no...

Warped wafers can affect device performance, reliability, and linewidth control in various processing steps. We propose this paper an situ fault detection technique for wafer warpage lithography. The use of advanced process results very small temperature disturbance making it suitable industrial implementation

This paper discussed the aging behaviour of Kevlar fibre reinforced flexible pipe subjected to long-term monotonic internal pressure. Multi-group pressure tests that last for 10,000 h were conducted. The pressure-time curves each test samples collected. Two typical failure modes specified. Linear regression analysis original data was conducted and expression between characteristic P service time T, which is capable provide fast evaluation qualification, presented. Based on suitable selection...

This paper describes the design and measured performance of a high-efficiency linearity-enhanced K-band MMIC amplifier fabricated with 0.15 μm GaAs pHEMT processing technology. The linearization enhancement method utilizing parallel nonlinear capacitance compensation diode was analyzed verified. three-stage operating at 20–22 GHz obtained an improved third-order intermodulation ratio (IM3) 20 dBc 27 dBm per carrier output power while demonstrating higher than dB small signal gain 1-dB...

This letter proposes a broadband high-efficiency quasi Class E internally matched power amplifier with compact bandpass output matching structure. By setting all the harmonic impedances following ideal mode, specific load-pull analysis is employed to achieve optimum fundamental impedance region both high and efficiency. In order further improve efficiency of amplifier, second range obtained by similar analysis. A structure only three inductors two capacitors utilized realize mode amplifier....

Abstract This article presents a six‐pole high‐temperature superconducting (HTS) filter with fractional bandwidth (FBW) of 0.09% at 3.3 GHz. Twin‐spiral resonators high quality factor ( Q u ) 69,000 are used in the design procedure. The measured results exhibit low insertion loss 0.62 dB and good agreement simulated ones. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:435–438, 2011; View this online wileyonlinelibrary.com. DOI 10.1002/mop.25700

A compact 6 W AlGaAs/InGaAs/GaAs monolithic microwave integrated circuit (MMIC) high power amplifier (HPA) is proposed for Ku-band applications. This three-stage with layout size of 14.35 mm2 (4.39 mm×3.27 mm) designed to fully match 50 O input and output impedance. 8 V 3300 mA DC bias condition, the MMIC delivers 30.4 dB small-signal gain, 37.8 dBm saturated 23.4 % added efficiency from 12 15 GHz. 38.5 maximum 27 peak at 13.3 GHz can be achieved. fabricated in 0.25 μm pseudomorphic...

This paper presents a high-efficiency continuous class B power amplifier MMIC (Monolithic Microwave Integrated Circuit) from 8 GHz to 10.5 GHz, fabricated with 0.25 μm GaN-on-SiC technology. The Pedro load-line method was performed calculate the optimum load of GaN field-effect transistor (FET) for efficiency enhancement. Optimized by an output second-harmonic tuned network, fundamental impedance, mapping established point-to-point within broad frequency band, which approached classic mode...

A compact dual-band printed flltering antenna fed by CPW(co planar wave guide) is presented. Though printing on the same substrate board like as a conventional antenna, proposed structure not only own unit of radiator but also second-order band-pass fllter, with two fllter poles provided rectangular -- circle stub. According to speciflcations, design process for depicted in enough detail. And operating bandwidth broadened and high selectivity improved correspondingly. The measured results...

A novel wide range input front-end dc-dc converter featuring in optimized overall efficiency is presented this paper. This proposed combines the two kinds of dual switch ZVS forward-flyback topologies together, while DC Gain for these different and that secondary full-bridge rectifier doubled than current-doubler rectifier. Therefore has an extended duty cycle under high-line condition which results improved maintaining low-line conversion ratio. By assistance a micro controller unit...