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A microstrip filter direct-coupled amplifier based on active coupling matrix synthesis Research Articles

Yang Gao, Fan Zhang, Yingying Qiao, Jiawei Zang, Lei Li, Xiaobang Shang,gaoyang678@outlook.com,lilei@zzu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 9,   Pages 1260-1269 doi: 10.1631/FITEE.2000292

Abstract: This paper presents a methodology of designing an integrated with a filter using an active . The filter is directly coupled to the active device, and the integrated filter can achieve filtering as well as matching functionalities, simultaneously, eliminating the need for separate matching networks. The filter is represented by an active , with additional columns and rows in the matrix corresponding to the active transistor. The matrix can be used to calculate the S-parameter responses (i.e., the return loss and the gain) and the initial dimensions of the integrated device. Moreover, the integration of a filter and an leads to a reduced loss and a more compact architecture of the devices. An X-band filter has been designed and demonstrated as an example. technology has been chosen because of its appealing advantages of easy fabrication, low cost, and most importantly, easy integration with active devices.

Keywords： 放大器；滤波–放大器集成；微带线；耦合矩阵    

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High linearity U-band power amplifier design: a novel intermodulation point analysis method Research Article

Jie CUI, Peipei LI, Weixing SHENG,cuijie@njust.edu.cn

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 1,   Pages 176-186 doi: 10.1631/FITEE.2200082

Abstract: A ’s linearity determines the emission signal’s quality and the efficiency of the system. Nonlinear distortion can result in system bit error, out-of-band radiation, and interference with other channels, which severely influence communication system’s quality and reliability. Starting from the third-order intermodulation point of the s, the circuit’s nonlinearity is compensated for. The analysis, design, and implementation of linear class AB mm-Wave s based on GlobalFoundries 45 nm technology are presented. Three single-ended and differential stacked s have been implemented based on cascode cells and triple cascode cells operating in U-band frequencies. According to nonlinear analysis and on-wafer measurements, designs based on triple cascode cells outperform those based on cascode cells. Using single-ended measurements, the differential achieves a measured peak power-added efficiency (PAE) of 47.2% and a saturated output power () of 25.2 dBm at 44 GHz. The amplifier achieves a higher than 23 dBm and a maximum PAE higher than 25% in the measured bandwidth from 44 GHz to 50 GHz.

Keywords： CMOS silicon-on-insulator (SOI)     Linearity analysis     Milimeter wave (mm-Wave)     Power amplifier    

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Energy-efficient power amplifiers and linearization techniques for massive MIMO transmitters: a review Review Articles

Xin LIU, Guan-sheng LV, De-han WANG, Wen-hua CHEN, Fadhel M. GHANNOUCHI

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1,   Pages 72-96 doi: 10.1631/FITEE.1900467

Abstract: Highly efficient power amplifiers (PAs) and associated linearization techniques have been developed to accommodate the explosive growth in the data transmission rate and application of massive multiple input multiple output (mMIMO) systems. In this paper, energy-efficient integrated Doherty PA monolithic microwave integrated circuits (MMICs) and linearization techniques are reviewed for both the sub-6 GHz and millimeter-wave (mm-Wave) fifth-generation (5G) mMIMO systems; different semi-conductor processes and architectures are compared and analyzed. Since the 5G protocols have not yet been finalized and PA specifications for mMIMO are still under consideration, it is worth investigating novel design methods to further improve their efficiency and linearity performance. Digital predistortion techniques need to evolve to be adapted in mMIMO systems, and some creative linearity enhancement techniques are needed to simultaneously improve the compensation accuracy and reduce the power consumption.

Keywords： Energy-efficient     Linearization     Massive multiple input multiple output (mMIMO)     Monolithic microwave integrated circuit (MMIC)     Power amplifier    

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Wideband cryogenic amplifier for a superconducting nanowire single-photon detector Research Article

Lianming Li, Long He, Xu Wu, Xiaokang Niu, Chao Wan, Lin Kang, Xiaoqing Jia, Labao Zhang, Qingyuan Zhao, Xuecou Tu,Lianming.LI@seu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 12,   Pages 1551-1684 doi: 10.1631/FITEE.2100525

Abstract: We present a low-power inductorless wideband differential using a 0.13-μm SiGe BiCMOS process for a . With a shunt–shunt feedback and capacitive coupling structure, theoretical analysis and simulations were undertaken, highlighting the relationship of the amplifier gain with the tunable design parameters of the circuit. In this way, the design and optimization flexibility can be increased, and a required gain can be achieved even without an accurate cryogenic device model. To realize a flat terminal impedance over the frequency of interest, an RC shunt compensation structure was employed, improving the amplifier’s closed-loop stability and suppressing the amplifier overshoot. The -parameters and transient performance were measured at room temperature (300 K) and cryogenic temperature (4.2 K). With good input and output matching, the measurement results showed that the amplifier achieved a 21-dB gain with a 3-dB bandwidth of 1.13 GHz at 300 K. At 4.2 K, the gain of the amplifier can be tuned from 15 to 24 dB, achieving a 3-dB bandwidth spanning from 120 kHz to 1.3 GHz and consuming only 3.1 mW. Excluding the chip pads, the amplifier chip core area was only about 0.073 mm.

Keywords： 超低温放大器；宽带放大器；超导纳米线单光子探测器    

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A 17–26.5 GHz 42.5 dBm broadband and highly efficient gallium nitride power amplifier design Correspondences

Ming LI, Zhiqun LI, Quan ZHENG, Lanfeng LIN, Hongqi TAO,liming_2018@seu.edu.cn,zhiqunli@seu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 2,   Pages 346-350 doi: 10.1631/FITEE.2000513

Abstract: A wideband power amplifier is one of the key components in mobile communication systems and radar systems because it is a key component of radio frequency (RF) front-end systems, and its performance occupies a dominant position in the entire system function. GaN as the representative of the third generation of wide band gap semiconductors has the advantages of wide band gap, high electron mobility, and high breakdown field strength (Mishra et al., 2008; Millán et al., 2014). The power density of the device far exceeds that of Si and GaAs. Because of its high frequency, high power, high efficiency, high temperature resistance, high radiation resistance, and other excellent characteristics, GaN MMICs have broad application prospects in the microwave and millimeter wave bands.

Keywords： K波段；高效率；宽带；氮化镓（GaN）；功率放大器    

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A novel method for extending the output power back-off range of an asymmetrical Doherty power amplifier Research Article

Mingyu LI, Xiaobing CHENG, Zhijiang DAI, Kang ZHONG, Tianfu CAI, Chaoyi HUANG

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 3,   Pages 470-479 doi: 10.1631/FITEE.2200250

Abstract: A novel method is proposed to extend the range of the . This study reveals that the OPBO range of the DPA can be extended by tuning the of the peaking stage away from infinity and changing the phase delay of the output matching network of the carrier power amplifier. Based on this theory, a large-OPBO-range high-efficiency asymmetrical DPA working band from 1.55 to 2.2 GHz (35% relative bandwidth) is designed to verify the proposed method. Experimental results show that the DPA operates from 1.6 to 2.1 GHz. The range of the measured efficiency is 42.2%–52.1% in the OPBO state and 47%–62.7% in the saturation state. The OPBO range is 11.1–13.2 dB.

Keywords： Doherty power amplifier (DPA)     Output power back-off (OPBO)     Output impedance     Network phase    

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A 9.8–30.1 GHz CMOS low-noise amplifier with a 3.2-dB noise figure using inductor- and transformer-based

Hongchen Chen, Haoshen Zhu, Liang Wu, Wenquan Che, Quan Xue,hongdoublechen@gmail.com,zhuhs@scut.edu.cn,wuliang@cuhk.edu.cn,eewqche@scut.edu.cn,eeqxue@scut.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 4,   Pages 586-598 doi: 10.1631/FITEE.2000510

Abstract: A 9.8–30.1 GHz (LNA) with a 3.2-dB minimum noise figure (NF) is presented. At the architecture level, a topology based on (CG) cascading with a common-source (CS) amplifier is proposed for simultaneous wideband input matching and relatively high gain. At the circuit level, multiple techniques are proposed to improve LNA performance. First, in the CG stage, loading effect is properly used instead of the conventional feedback technique, to enable simultaneous impedance and noise matching. Second, based on in-depth theoretical analysis, the inductor- and -based techniques are employed for the CG and CS stages, respectively, to enhance the gain and reduce power consumption. Third, the floating-body method, which was originally proposed to lower NF in CS amplifiers, is adopted in the CG stage to further reduce NF. Fabricated in a 65-nm technology, the LNA chip occupies an area of only 0.2 mm and measures a maximum power gain of 10.9 dB with −3 dB bandwidth from 9.8 to 30.1 GHz. The NF exhibits a minimum value of 3.2 dB at 15 GHz and is below 5.7 dB across the entire bandwidth. The LNA consumes 15.6 mW from a 1.2-V supply.

Keywords： CMOS；跨导提升技术；低噪声放大器；变压器；共栅级    

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Bisimulation-based stabilization of probabilisticBoolean control networkswith state feedback control Research Articles

Nan JIANG, Chi HUANG, Yao CHEN, Jürgen KURTHS

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 2,   Pages 268-290 doi: 10.1631/FITEE.1900447

Abstract: This study is concerned with probabilistic Boolean control networks (PBCNs) with state feedback control. A novel definition of bisimilar PBCNs is proposed to lower computational complexity. To understand more on bisimulation relations between PBCNs, we resort to a powerful matrix manipulation called semi-tensor product (STP). Because stabilization of networks is of critical importance, the propagation of stabilization with probability one between bisimilar PBCNs is then considered and proved to be attainable. Additionally, the transient periods (the maximum number of steps to implement stabilization) of two PBCNs are certified to be identical if these two networks are paired with a bisimulation relation. The results are then extended to the probabilistic Boolean networks.

Keywords： Probabilistic Boolean control network     Bisimulation     Stabilization with probability one     State feedback control    

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Analysis and design of transformer-based CMOS ultra-wideband millimeter-wave circuits for wireless applications: a review Review Articles

Yi-ming YU, Kai KANG

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1,   Pages 97-115 doi: 10.1631/FITEE.1900491

Abstract: With a lot of millimeter-wave (mm-Wave) applications being issued, wideband circuits and systems have attracted much attention because of their strong applicability and versatility. In this paper, four transformer-based ultra-wideband mm-Wave circuits demonstrated in CMOS technologies are reviewed from theoretical analysis, implementation, to performance. First, we introduce a mm-Wave low-noise amplifier with transformer-based Gm-boosting and pole-tuning techniques. It achieves wide operating bandwidth, low noise figure, and good gain performance. Second, we review an injection-current-boosting tech-nique which can significantly increase the locking range of mm-Wave injection-locked frequency triplers. Based on the injection- locked principle, we also discuss an ultra-wideband mm-Wave divider with the transformer-based high-order resonator. Finally, an E-band up-conversion mixer is presented; using the two-path transconductance stage and transformer-based load, it obtains good linearity and a large operating band.

Keywords： CMOS     Millimeter-wave (mm-Wave)     Ultra-wideband     Transformer     Low-noise amplifier     Injection-locked fre-quency tripler     Injection-locked frequency divider     Mixer    

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Compact input-reflectionless balanced bandpass filter with flexible bandwidth using three-line coupled structure Research Article

Yahui ZHU, Jing CAI, Wei QIN, Wenwen YANG, Jianxin CHEN

Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 2,   Pages 314-326 doi: 10.1631/FITEE.2200261

Abstract: A compact input-reflectionless with flexible bandwidth (BW) using a is presented in this paper. For the , the TLCS is applied to achieve the bandpass response; meanwhile, the input coupled-feed line of the TLCS is reused in the input absorption network. This design shows a good fusion of the absorptive and BPF sections, effectively reducing the circuit size, and the BWs of the two sections that can be controlled separately result in a flexibly controllable DM response BW of the proposed input-reflectionless balanced BPF. Detailed analyses of the ratio of the two-part BWs have been given for the first time, which is vital for the passband flatness and reflectionless feature. In the codesign of this work, the input-reflectionless DM bandpass response can be optimized easily, while wideband noise absorption is achieved by the input absorption network. To verify the design method, a prototype with a compact layout (0.52×0.36) is designed and measured in the 0‍‒‍7.0 GHz range. The DM center frequency () is 2.45 GHz with a measured 3 dB fractional bandwidth of 31.4%. The simulation and measurement results with good agreement are presented, showing good performance, e.g., low insertion loss (0.43 dB), wide upper stopband for the DM bandpass response (over 20 dB rejection level up to 2.72), and wideband DM reflectionless and CM noise absorption (fractional absorption bandwidth of 285.7%).

Keywords： Input-reflectionless filter     Balanced bandpass filter (BPF)     Differential mode (DM)     Common mode (CM)     Three-line coupled structure (TLCS)    

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Simulation on Scaling-up for Coupling to Oxalic Acid in Gaseous Phase

Wang Baowei,Ma Xinbin,Li Zhenhua,Xu Genhui

Strategic Study of CAE 2001, Volume 3, Issue 2,   Pages 79-85

Abstract:

The synthesis of oxalic acid by CO coupling reaction in gaseous phase is a circulating system with multi-step reactions. The best catalyst was prepared and the reaction mechanism was proposed in the past work. It was found that the key problem for scaling-up this process is to match the CO coupling reaction rate with the regeneration rate. In this thesis, these two reactions were simulated by analyzing the sensitivity of operating parameters based on the acquired reaction kinetics. It was proposed that the match of these two reactions is a complex non-linear process. The key technique was investigated during the scale-up experiments of catalyst preparation and CO coupling reaction. By analyzing the simulation and experimental results, the key problem for the match of CO coupling with regeneration reaction was resolved. The scale-up circulating system for oxalic production was continuously run for 1000 hours and no intermediates was vented. It was proved that the match of these two reactions was achieved and an environmentally benign process for oxalic acid production has been set-up after a series of study. It provides a new technology for industrial production of oxalic acid.

Keywords： CO coupling     oxalic acid     scale-up experiment     catalytic engineering    

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Study on the Fermentation Processes at Multi-levels in Bioreactor and Its Application for Special Purposes——Optimization and Scaling Up of the Fermentation Process Based on the Parameter Correlation Method

Zhang siliang

Strategic Study of CAE 2001, Volume 3, Issue 8,   Pages 37-45

Abstract:

After reviewing the basic idea, methods of optimization and scale up for fermentation process adopted by many researchers for quite a long time, the author believes that the static optimizing method based on the kinetic conception with conventional optimum operating condition, in fact, is only an extension of kinetic conception of chemical engineering to the fermentation process. Such being the case, the existence of cellular metabolic flux is often neglected. Thus, the viewpoint to emphasize the metabolic flux analysis and control in bioreactor is put forward in this paper. Through several further experiments, the optimization technology of fermentation process at multi-levels based on the parameter correlation methodology and scaling-up strategy with multi parameters modulation have been realized. With the development of process sensing and computer technology, the new concept bioreactor (FUS-50L(A)) is used for fermentation processes optimization and scale up. This new bioreactor aimed at the measurement of material flux has been successfully applied to the fermentation of penicillin, erythromycin, aureomycin, inosine, guanosine, as well as the cultivation of recombinant human serum albumin, malaria vaccine, etc. As a result, thirty percent to several folds increase in titers were achieved. The process can be directly used for the scale up of Permentor from 50 liters to several hundred liters, even to 100 m3.

Keywords： bioreactor     fermentation     optimization     scale up    

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Electrochemical Removal of Chlorophenol Pollutants by Reactive Electrode Membranes: Scale-up Strategy for Engineered Applications Article

Shuzhao Pei, Yi Wang, Shijie You, Zhanguo Li, Nanqi Ren

Engineering 2022, Volume 9, Issue 2,   Pages 77-84 doi: 10.1016/j.eng.2021.11.017

Abstract:

Chlorophenols (CPs) are significant refractory pollutants that are highly toxic to humans and other organisms. Reactive electrode membranes (REMs) show considerable potential in the electrochemical removal of refractory pollutants by allowing flow-through operations with convection-enhanced mass transfer. However, relevant studies are commonly performed on the laboratory scale, and there is no straightforward method that guarantees success in scaling up engineered REM reactors. In this study, we demonstrated that a tubular concentric electrode (TCE) configuration with a titanium suboxide ceramic anode and a stainless-steel cathode is suitable for large-scale CPs removal. Both theoretical and experimental results showed that the TCE configuration not only allows the electrode surface to be orthogonal to electric field lines everywhere, but also has an ohmic resistance that is inversely proportional to the length of the electrode. In addition, the TCE configuration can be operated in either the anode-to-cathode (AC) or the cathode-to-anode (CA) mode based on the flow direction, creating adjustable conditions for selective degradation of CPs. This was confirmed by 98% removal of 2,4-dichlorophenol (2,4-DCP) and 72.5% removal of chemical oxygen demand (COD) in the CA mode, in which the kinetic constant was one order of magnitude higher than that for the AC mode under flow-through single-pass operations. This can be explained by the lower activation energy and free energy in the CA mode, as revealed by theoretical calculations and experimental measurements. The TCE configuration is also suitable for a numbering-up strategy to scale up the electrochemical reactor without increasing the ohmic resistance or decreasing the specific electrode area, achieving 99.4% removal of 2,4-DCP with an energy consumption of 1.5 kW·h·m−3 when three TCE modules were employed. This study presents a suitable electrode design configuration for the REM reactor, offering effective strategies to bridge the “Valley of Death” encountered when scaling up the electrochemical removal of CP pollutants.

Keywords： Chlorophenols     Reactive electrode membrane     Tubular concentric electrode     Scale-up    

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Correspondence: Monopulse transmitarray antenna fed by aperture-coupled microstrip structure Correspondence

Na KOU, Shixing YU, Zhao DING, Zhengping ZHANG,nkou@gzu.edu.cn,sxyu1@gzu.edu.cn,zding@gzu.edu.cn,zpzhang@gzu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 3,   Pages 502-510 doi: 10.1631/FITEE.2000547

Abstract: Monopulse technique, also known as the simultaneous beam comparison method, is used mainly to measure the direction of arrival (DOA) (Sherman and Barton, 2011). Before the advent of monopulse technology, the method most widely used in radar direction finding was the lobe-switching technique (sequential lobing) (Lo, 1999). Compared with the sequential lobing method, the monopulse antenna can obtain information such as the pitch angle, azimuth angle, and distance of the target in a single pulse period (Vazquez-Roy et al., 2019). Due to the need for higher accuracy of angle measurement, the monopulse technique has been widely applied in SOTM missile guidance (Roy et al., 2019). When a monopulse system is working, multiple independent channels are adopted to receive signals reflected by targets at the same time. Then signals enter the comparator and finally the distance and angle information of targets can be obtained. There are three main types of monopulse antennas: lenses, reflectors, and arrays. A dielectric lens is generally a convex lens (Raman et al., 1998), which is difficult to manufacture due to its curved shape, high volume, and large mass. For common reflectors such as dish antennas, the feed and supporting structure are in front of the aperture, so a shielding effect will result in energy loss, sidelobe increase, and angle measurement error (Kou and Cheng, 2019). A more effective reflector is the Cassegrain antenna, which is more compact with dual reflectors (Zheng et al., 2016, 2017). However, the Cassegrain antenna has the problem of shielding effect caused by a secondary reflector and support rods. With growing demand for low cost and lightweight monopulse antennas in modern radar and telecommunications systems, array antennas are increasingly applied in monopulse antennas due to their characteristics of high gain and easy control of the beam direction. A typical example is the waveguide slot array, which has the advantages of low loss, low sidelobe level, and no aperture shielding problem (Vosoogh et al., 2018). The microstrip has attracted much attention in monopulse antennas because of its advantages of low profile, simple structure, and low cost (Yu et al., 2009; Kumar and Kumar, 2018). However, monopulse microstrip array antennas usually have a complex feed network, which often makes them large and expensive. In addition, substrate integrated waveguides (SIWs) (Cao et al., 2017; Zhu et al., 2018; Liu et al., 2019; Yang et al., 2019) and leaky wave antennas (LWAs) (Poveda-García et al., 2019) have been applied in monopulse antennas, with good results. Recently, reflectarrays have been proposed for use in monopulse antennas, and have shown good performance (Zhao et al., 2017, 2018). As an alternative to reflectarrays, transmitarrays not only have the advantages of reflectarrays, but also have no shielding effect from the feeds. Di Palma et al. (2016) proposed a 400-element reconfigurable transmitarray antenna to synthesize monopulse radiation patterns. However, the sum and difference patterns generated by the reconfigurable transmitarray antenna, which is controlled electronically by switches instead of by a SUM-DIFF comparator, are in time division.

Keywords： 孔径耦合；单脉冲天线；微带；透射阵列    

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System Integration and Innovation of Operating 20 kt Combined Heavy-haul Train on Datong—Qinhuangdao Line

Geng Zhixiu

Strategic Study of CAE 2008, Volume 10, Issue 3,   Pages 31-43

Abstract:

Datong—Qinhuangdao line, as the first electrified double-track heavy-haul line dedicated to coal transportation in China, extends from Beitongpu line in the west,reaches Qinhuangdao in the east,and opened in Dec., 1992, totaling 653 km with designed volume of 1×108 t/a. In order to meet the requirements of national economical development, the transport capacity of the line must be expanded rapidly. Depending on independent innovation, MOR,for the first time in the world,realized the integration between GSM-R and Locotrol, the integration between 800 MHz digital radio and Locotrol, and the integration between a single set of Locotrol and SS4. Meanwhile, it developed auxiliary equipment for heavy-haul transportation through combining 2 Hexie heavy-duty locomotives with controllable train ends. Relying on integration innovation, it succeeded in operating 20 kt-level combined heavy-haul train on Datong—Qinhuangdao line, which triples the annual volume of the line from 1×108 t in 2002 to 3×108 t in 2007.

Keywords： China railways     Datong—Qinhuangdao line     20 kt-level combined heavy-haul train     integration innovation    

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Title Author Date Type Operation

A microstrip filter direct-coupled amplifier based on active coupling matrix synthesis

Yang Gao, Fan Zhang, Yingying Qiao, Jiawei Zang, Lei Li, Xiaobang Shang,gaoyang678@outlook.com,lilei@zzu.edu.cn

Journal Article

High linearity U-band power amplifier design: a novel intermodulation point analysis method

Jie CUI, Peipei LI, Weixing SHENG,cuijie@njust.edu.cn

Journal Article

Energy-efficient power amplifiers and linearization techniques for massive MIMO transmitters: a review

Xin LIU, Guan-sheng LV, De-han WANG, Wen-hua CHEN, Fadhel M. GHANNOUCHI

Journal Article

Wideband cryogenic amplifier for a superconducting nanowire single-photon detector

Lianming Li, Long He, Xu Wu, Xiaokang Niu, Chao Wan, Lin Kang, Xiaoqing Jia, Labao Zhang, Qingyuan Zhao, Xuecou Tu,Lianming.LI@seu.edu.cn

Journal Article

A 17–26.5 GHz 42.5 dBm broadband and highly efficient gallium nitride power amplifier design

Ming LI, Zhiqun LI, Quan ZHENG, Lanfeng LIN, Hongqi TAO,liming_2018@seu.edu.cn,zhiqunli@seu.edu.cn

Journal Article

A novel method for extending the output power back-off range of an asymmetrical Doherty power amplifier

Mingyu LI, Xiaobing CHENG, Zhijiang DAI, Kang ZHONG, Tianfu CAI, Chaoyi HUANG

Journal Article

A 9.8–30.1 GHz CMOS low-noise amplifier with a 3.2-dB noise figure using inductor- and transformer-based

Hongchen Chen, Haoshen Zhu, Liang Wu, Wenquan Che, Quan Xue,hongdoublechen@gmail.com,zhuhs@scut.edu.cn,wuliang@cuhk.edu.cn,eewqche@scut.edu.cn,eeqxue@scut.edu.cn

Journal Article

Bisimulation-based stabilization of probabilisticBoolean control networkswith state feedback control

Nan JIANG, Chi HUANG, Yao CHEN, Jürgen KURTHS

Journal Article

Analysis and design of transformer-based CMOS ultra-wideband millimeter-wave circuits for wireless applications: a review

Yi-ming YU, Kai KANG

Journal Article

Compact input-reflectionless balanced bandpass filter with flexible bandwidth using three-line coupled structure

Yahui ZHU, Jing CAI, Wei QIN, Wenwen YANG, Jianxin CHEN

Journal Article

Simulation on Scaling-up for Coupling to Oxalic Acid in Gaseous Phase

Wang Baowei,Ma Xinbin,Li Zhenhua,Xu Genhui

Journal Article

Study on the Fermentation Processes at Multi-levels in Bioreactor and Its Application for Special Purposes——Optimization and Scaling Up of the Fermentation Process Based on the Parameter Correlation Method

Zhang siliang

Journal Article

Electrochemical Removal of Chlorophenol Pollutants by Reactive Electrode Membranes: Scale-up Strategy for Engineered Applications

Shuzhao Pei, Yi Wang, Shijie You, Zhanguo Li, Nanqi Ren

Journal Article

Correspondence: Monopulse transmitarray antenna fed by aperture-coupled microstrip structure

Na KOU, Shixing YU, Zhao DING, Zhengping ZHANG,nkou@gzu.edu.cn,sxyu1@gzu.edu.cn,zding@gzu.edu.cn,zpzhang@gzu.edu.cn

Journal Article

System Integration and Innovation of Operating 20 kt Combined Heavy-haul Train on Datong—Qinhuangdao Line

Geng Zhixiu

Journal Article