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Differential Antennas: Fundamentals and Applications

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Electromagnetic Science 2023年第1期1卷 1-17页

作者： yueping zhang Nanyang Technological University 639698Singapore

Driven by the great demand for highly integrated wireless system-on-chip and system-in-package devices,there has recently been increas-ing interest in the research and development of differential *** studies on the design,analysis,and measurement of differential antennas have been *** paper presents an overview of the fundamentals and applications of differential ***,it compares differential to bal-anced and single-ended to unbalanced antennas and explains why the new terms(differential and single-ended antennas)should be adopted instead of the old terms(balanced and unbalanced antennas).Second,it addresses the quantitative relationship between a differential antenna and its single-ended counterpart,which is important and useful because the properties of either the differential or single-ended antenna can be determined from the other with a known ***,it describes how differential antennas can be measured,with a special emphasis on the balun ***,it classifies dif-ferential antennas into wire,slot,microstrip,printed,and dielectric resonator antennas to better present their suitability and ***,it pro-vides application examples of differential antennas from simple discrete wire to sophisticated microstrip ***,it is argued that the old paradigms of lower gains and bulkier sizes of differential antennas as compared to single-ended antennas do not always hold true;for instance,differen-tial microstrip patch antennas can possess comparable or even smaller sizes and higher gain values than single-ended microstrip patch antennas.

关键词： Differential antennas Single-ended antennas Balanced antennas Unbalanced antennas Antenna-in-package Antenna-on-chip

Differential Quasi-Yagi Antenna and Array

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ZTE Communications 2023年第3期21卷 37-44页

作者： ZHU Zhihao zhang yueping Key Laboratory of Ministry of Education of Design and Electromag-netic Compatibility of High-Speed Electronic Systems Shanghai Jiao Tong UniversityShanghai 200240China Nanyang Technological University Singapore 639798Singapore

A novel differential quasi-Yagi antenna is first presented and compared with a normal single-ended *** simulated and measured results show that the differential quasi-Yagi antenna outperforms the conventional single-ended *** differential quasi-Yagi antenna is then used as an element for linear arrays.A study of the coupling mechanism between the two differential and the two singleended quasi-Yagi antennas is conducted,which reveals that the TE0 mode is the dominant mode,and the driver is the decisive part to account for the mutual ***,the effects of four decoupling structures are respectively evaluated between the two differential quasi-Yagi ***,the arrays with simple but effective decoupling structures are fabricated and *** measured results demonstrate that the simple slit or air-hole decoupling structure can reduce the coupling level from−18 dB to−25 dB and meanwhile maintain the impedance matching and radiation patterns of the array over the broad *** differential quasi-Yagi antenna should be a promising antenna candidate for many applications.

关键词： differential quasi-Yagi antenna and array mutual coupling surface wave

Tailoring Meta-Liquid Crystal for Larger Tunability

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Electromagnetic Science 2023年第4期1卷 41-50页

作者： Jun Shu yueping zhang Key Laboratory of Ministry of Education of Design and Electromagnetic Compatibility of High Speed Electronic Systems Shanghai Jiao Tong UniversityShanghai 200240China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

Liquid crystals are pivotal innovations in the field of tunable ***,in the millimeter wave band,the relatively low tunability of liquid crystal limits its applicability.A design method utilizing metamaterial characteristics to enhance the tunability of a liquid crystal is *** design method is based on two theoretical *** models embed metamaterial structures into a liquid crystal,thus tailoring a new tunable material,namely,a meta-liquid *** appropriately designing the metamaterials to meet the corresponding conditions derived in different models,the tunability of the meta-liquid crystal can be higher than that of the original liquid *** application of beam scanning is provided to verify this *** beam steerable antenna arrays are designed,fabricated and *** beam scanning range of the meta-liquid crystal antenna array is much wider than that of the original liquid crystal antenna array,which confirms the enhancement of ***,this work fills the research gap in improving the performance of liquid crystals in the millimeter wave ***,a bridge is established between two significant materials:tunable materials and *** results imply that the performance of tunable materials can be manipulated by metamaterials.

关键词： Epsilon negative Metamaterials Liquid crystal Steerable antenna.

Gastric vagal afferent inputs reach the glycemia-sensitive neurons of lateral hypothalamic area in the rat

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Chinese Science Bulletin 2003年第6期48卷 577-581页

作者： zhang yueping ZHU Jingning JIANG Jianming WANG Jianjun Department of Biological Science and Technology Nanjing UniversityNanjing 210093China

The glycemia-sensitive neuron in lateral hypothalamic area (LHA) is one of the important central neural events involved in the feeding control. Electrophysio-logical studies have demonstrated that gastrointestinal vagal afferent inputs could convey the meal-related information of gastrointestinal tract to the hypothalamus. In this study, we examined whether the gastric vagal afferent inputs could reach the glycemia-sensitive neurons of the LHA by using in vivo extracellular recording technique in the rat. The results showed that stimulation of gastric vagal nerves elicited two types of the LHA neurons responses: the phasic response (93/116, 80.2%) and the change in cells firing pattern (23/116, 19.8%). Within the 93 cells that responded to the gastric vagal stimulation with a phasic response, 67 (72.0%) showed an inhibition in the cells firing rate, 26 (27.4%) were excited. Of the 23 cells that showed a change in the firing pattern, 13 responded to the gastric vagal stimulation with a long-lasting increase or decrease in firing rate, the remaining 10 cells turned their discrete spiking to the burst discharging. In addition, of 101 LHA neurons including the two types of responsive neurons, 73 (72.3%) were identified to be glyce-mia-sensitive neurons. These results demonstrated that the gastric vagal afferent inputs could reach the LHA and pre-dominantly reach those glycemia-sensitive neurons in the LHA. Presumably, the modulation of glycemia-sensitive neurons of LHA by the gastric vagal afferent inputs may play an important role in the short-term regulation of feed-ing behavior.

关键词：大鼠下丘脑外侧区胃迷走神经传入纤维摄食调节血糖感受神经元

Modification of acidity of Mo-Fe/HZSM-5 zeolite via argon plasma treatment

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Frontiers of Chemical Science and Engineering 2008年第1期2卷 55-58页

作者： Xinli ZHU Kailu YU Dangguo CHENG yueping zhang Qing XIA Changjun LIU Key Laboratory for Green Chemical Technology School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Department of Chemistry Tianjin UniversityTianjin 300072China

TheNH_(3)-TPDcharacterization wasconducted to confirm that the acidity of Mo-Fe/HZSM-5 zeolite could be selectively modified via the glow discharge plasma *** plasma catalyst treatment could totally change the distribution of aromatic products with higher methane conversion compared to the untreated *** polycyclic aromatics such as anthracene,pyrene and phenanthrene were also produced over the plasma treated catalyst,in addition to benzene,toluene and naphthalene,which were normally obtained over the untreated catalyst.

关键词： methane aromatization plasma acidity Mo-Fe/HZSM-5 zeolite

Editorial:Special Topic on Antennas and RF Technologies for 5G/B5G Mobile Communications

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ZTE Communications 2020年第3期18卷 1-2页

作者： LI Ronglin zhang yueping MA Jianguo School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore

The 5G mobile communication systems are being deployed worldwide and China has been a global leader in the new *** number of base stations for 5G mobile communications is increasing by more than ten thousand every week in *** the end of this year,about 500000 base stations will be built up nationwide,covering more than 300 *** beyond 5G(B5G)mobile systems with enhanced transmission technologies are also being developed and attracting much *** emerging millimeter wave(mmW)and massive multiple-input multiple-output(MIMO)technologies are expected to become key enabling technologies for 5G/B5G mobile *** China,the mmW bands 24.75–27.5 GHz and 37–42.5 GHz have been allocated for future 5G/B5G trials and it is anticipated that the 5G/B5G mobile communication systems based on mmW massive MIMO technologies will be ready for commercial use in *** the key components in these communication systems,antennas and RF front ends play an important role in implementing ubiquitous connection among hundreds of different devices in 5G/B5G networks.

关键词： millimeter communication massive

Rapid and visual RPA-CRISPR/Cas12a detection for Staphylococcus pseudintermedius and methicillin-resistant *** in clinical samples of dogs and cats

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One Health Advances 2023年第1期1卷 149-161页

作者： Pingping Gao Shuobo Shi Di zhang yueping zhang National Key Laboratory of Veterinary Public Health and Safety College of Veterinary MedicineChina Agricultural UniversityBeijing 100193China Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Life Science and TechnologyBeijing University of Chemical TechnologyBeijing 100029China Beijing Zhongnongda Veterinary Hospital Co. LtdBeijing 100193China.

Staphylococcus pseudintermedius can cause severe infections of the skin,ear and other tissues in dogs and ***-cillin-resistant ***(MRSP)has recently become more prevalent,posing a severe threat to companion animals and public ***,rapid and accurate diagnosis of *** and MRSP infections in dogs and cats is essential for timely controlling *** development of CRISPR/Cas technology offers an innovative solution for rapid ***,we established an assay combining recombinant polymerase amplification(RPA)and CRISPR/*** separately detecting the spsJ gene,the specific gene of ***,and the mecA gene,the methicillin resistance gene,this method allows for the direct detection of methicillin-susceptible ***-intermedius(MSSP)and MRSP in clinical samples at 37℃for a total of 40 min,The results can be directly visualized by the naked eye under blue *** limits of detection of the RPA-CRISPR/Cas12a assay were 103 copies per reaction for the spsJ gene and 104 copies per reaction for the mecA *** RPA-CRISPR/Cas12a detection successfully detected and differentiated clinical isolates of MSSP and MRSP without cross-reactivity with other tested bacteria *** evaluation of the detection performance of RPA-CRISPR/Cas12a with 47 clinical samples(without culture)from dogs and cats showed that the results of detection were 100%consistent with those of clinical culture and colony sequencing,which was more sensitive than ***-CRISPR/Cas12a assay can quickly and sensitively detect *** and MRSP in clinical samples without expensive instruments,making it suitable for small veterinary clinics.

关键词： clinical methicillin resistant

AB-8大孔树脂对葡萄籽原花青素的吸附过程

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化工学报 2013年第3期64卷 980-985页

作者：赵平张月萍任鹏河北科技大学化学与制药工程学院河北石家庄050018 河北省药物化工工程技术研究中心河北石家庄050018 河北省石油化工设计院有限公司河北石家庄050061

研究葡萄籽原花青素粗提液在AB-8大孔树脂上的吸附过程,建立了AB-8大孔树脂吸附原花青素的相平衡方程和动态吸附模型,计算了不同流速、不同进料浓度下的总传质系数、传质区长度及穿透时间。实验结果表明,原花青素静态吸附符合Langmuir... 详细信息

研究葡萄籽原花青素粗提液在AB-8大孔树脂上的吸附过程,建立了AB-8大孔树脂吸附原花青素的相平衡方程和动态吸附模型,计算了不同流速、不同进料浓度下的总传质系数、传质区长度及穿透时间。实验结果表明,原花青素静态吸附符合Langmuir吸附等温方程式;AB-8树脂对原花青素的动态吸附属于外扩散控制过程;穿透时间计算值与实验值一致。建立的数学模型可用于指导实际生产操作,为吸附柱的设计提供参考。

关键词：大孔树脂原花青素吸附理论模型

How to Evaluate the Rice Cultivation Suitability?

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Asian Agricultural Research 2013年第12期5卷 59-64页

作者： Wenxi LI yueping zhang Changsong WANG Wei MAO Tianwen HANG Ming CHEN Bingning zhang Yangzhou Station of Soil and Fertilizer Yizheng Station of Soil and Fertilizer

To rationally allocate farmland resources,and scientifically make farming industrial planning,we take Yizheng City in Jiangsu Province as the research object,and select 13 *** on Farmland Resources Management Information System in Yizheng City,we establish AHP model,and membership function model,for the evaluation of farmland suitability of *** results show that the farmland area in the highly suitable areas accounts for 10.2%of the total farmland area;the farmland area in the suitable areas accounts for 56.08%of the total farmland area;the farmland area in the marginally suitable areas accounts for 25.50%of the total farmland area;the farmland area in the unsuitable areas accounts for 8.22%of the total farmland *** is significant positive correlation between the actual yield of rice surveyed and suitability index obtained through evaluation(R2=0.1964,319 samples);the actual yield of rice in the highly suitable areas is higher than in the marginally suitable areas and suitable areas,and the rice yield is the lowest in the unsuitable areas.

关键词： Rice Farmland suitability Suitability index Evalua