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Optimization of large-area YBa_(2)Cu_(3)O_(7-δ)thin films by pulsed laser deposition for planar microwave devices

Chinese Physics B 2023年第7期32卷 186-190页

作者：熊沛雨陈赋聪冯中沛杨景婷夏钰东袁跃峰王旭袁洁吴云石兢金魁 School of Physical Science and Technology Wuhan UniversityWuhan 430072China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100490China Songshan Lake Materials Laboratory Dongguan 523808China School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 611756China

This paper presents high quality YBa_(2)Cu_(3)O_(7-δ)(YBCO)thin films on LaAlO_(3)substrate for microwave devices prepared by pulsed laser deposition(PLD).The double-sided YBCO films cover a large area and have been optimized for key parameters relevant to microwave device applications,such as surface morphology and surface resistance(R_(s)).This was achieved by improving the target quality and increasing the oxygen pressure during deposition,*** evaluate the suitability of the YBCO films for microwave devices,a pair of microwave filters based on microstrip fabricated on films from this work and a commercial company were *** results show that the YBCO films in this work could completely meet the requirements for microwave devices.

关键词： YBCO films pulsed laser deposition(PLD) surface resistance microwave devices

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The advancement of solid-state microwave and optoelectronic devices

The advancement of solid-state microwave and optoelectronic ...

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2002 3rd International Conference on microwave and Millimeter Wave Technology

作者： Zhao Zheng Ping Li Shuanqing Hebei Semiconductor Research Institute

ISBN: (纸本)078037486X

＜正＞*** In the middle of the 20th century,semiconductor single crystal material,semiconductor transistors and integrated circuits were invented in *** a result,a revolution in electronic industry was well under its *** the material-growing technologies have been progressing continually,especially with the successful development of semiconductor super lattice

关键词： microwave devices optoelectronic devices solid-state microwave devices solid-state optoelectronic devices China Si GaAs InP

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Operating Characteristics of Cathodes Used for microwave Vacuum-Electronic devices

Operating Characteristics of Cathodes Used for Microwave Vac...

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The 5th International Vacuum Electron Sources Conference(IVESC2004)

作者： V.G.Vorozheikin V.I. Kozlov RPC "Electron Systems" of FSUE RPE "ALMAZ" 1Panfilova str.Saratov410033Russia

＜正＞Ensuring the emissive reliability of microwave vacuum-electronic devices （MVED） is closely related to knowledge of the main operating characteristics of cathodes, primarily of cathode emissive ability and potential （resource） life. In research practice it is convenient to perform an estimate of cathode emissive ability via pre-heated curve [1] from which the knee temperature Tkn is found.

关键词： Cathodes microwave devices Current density Knee Electrons Vacuum systems Temperature dependence Production Nickel Additives

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Effect of Cu doping on the secondary electron yield of carbon films on Ag-plated aluminum alloy

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Chinese Physics B 2022年第4期31卷 681-685页

作者： Tiancun Hu Shukai Zhu Yanan Zhao Xuan Sun Jing Yang Yun He Xinbo Wang Chunjiang Bai He Bai Huan Wei Meng Cao Zhongqiang Hu Ming Liu Wanzhao Cui Key Laboratory for Physical Electronics and devices of the Ministry of Education School of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China National Key laboratory of Science and Technology on Space microwave China Academy of Space Technology(Xi’an)Xi’an 710100China Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric ResearchSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China

Reducing the secondary electron yield(SEY)of Ag-plated aluminum alloy is important for high-power microwave *** this work,Cu doped carbon films are prepared and the secondary electron emission characteristics are studied *** secondary electron coefficientδ_(max) of carbon films increases with the Cu contents increasing at first,and then decreases to 1.53 at a high doping ratio of *** the viewpoint of surface structure,the higher the content of Cu is,the rougher the surface is,since more cluster particles appear on the surface due to the small solid solubility of Cu in the amorphous carbon ***,from viewpoint of the electronic structure,the reduction of the sp2 hybrid bonds will increase the SEY effect as the content of Cu increases,due to the decreasing probability of collision with free ***,the two mechanisms would compete and coexist to affect the SEY characteristics in Cu doped carbon films.

关键词： copper-doped carbon secondary electron yield microwave devices surface roughness

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An Ultra-Miniature Cell-Type Rb Atomic Clock Based on a Novel Waveguide Cavity

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Chinese Physics Letters 2014年第9期31卷 167-170页

作者：白丽娜曹远洪刘类骥杨林郑兴世周渭 Department of Measurement and Instrument Xidian University Xi'an 710071 Technologic Center of Atomic Clock Spaceon Co. Ltd. Chengdu 611731 State Key Laboratory of Astronautic Dynamics Xi'an 710043

We introduce a novel waveguide cavity for ultra-miniature cell-type Rb atomic clock. In the cavity, a coupling ring shaped to be a semi-circle imports an rf signal from electronics, a screw regulator acts as a medium coupler to transmit the microwave signM into the absorption cell, and both the parts serve as a filter to suppress useless components except 6.8 GHz. Furthermore, the waveguide cavity can be used to design a miniature Rb atomic clock, and spread it to a chip-scale atomic clock. We have completed the design of the smallest cell-type Fib atomic clock in the world based on this waveguide cavity. It has not only a small size but also obviously better key performances than those of other miniature Rb atomic clocks. This ultra-miniature cell-type/75 atomic clock aging is 4 × 10-13/d, which is obviously slower than that of other miniature Rb atomic docks.

关键词： ATOMIC clocks RESEARCH WAVEGUIDES microwaveS CAVITY resonators microwave devices

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In-service monitor for chromatic dispersion using microwave technology in a 40-Gbit/s optical fiber communication system

In-service monitor for chromatic dispersion using microwave ...

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20th Congress of the International Commission for Optics

作者： Jin Zhang*a Wencai Jinga Yan Lia Jinlong Yub Yimo Zhanga Dagong Jiaa Ge Zhoua Yanan Lib Hao Huba College of Precision Instrument & Opto-electronics Engineering Tianjin University Tianjin 300072 P. R. China Key Laboratory of Opto-electronics Information and Technical Science (Tianjin University) Ministry of Education Tianjin 300072 China b College of Electronic Information Engineering Tianjin University Tianjin 300072 P.R.China Key Laboratory of Optical Fiber Communicaton (Tianjin University) Ministry of Education Tianjin 300072 China

A feasible and cost-effective online chromatic dispersion (CD) monitoring scheme for high speed optical communication system is demonstrated in this paper. Based on the formerly verified theoretical m

关键词： chromatic dispersion monitoring electrical power microwave devices dynamic dispersion compensation

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Field Emission Properties of Nanocrystalline Carbon Films Generated in microwave Gas Discharge Plasma

Field Emission Properties of Nanocrystalline Carbon Films Ge...

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The 5th International Vacuum Electron Sources Conference(IVESC2004)

作者： S.Yu.Suzdaltsev R.K.Yafarov Institute of Radio Engineering and Electronics of RAS Saratov Department410009 Saratov P.B.1072

＜正＞The carbon film synthesis in a low-pressure microwave （MW） gas discharge plasma is one of promising procedures to obtain carbon electronics materials used in device operating under extreme *** is due to the fact that,by its nature,carbon can generate materials with various chemical bond types compatible, in limiting cases,to the allotropic modifications of graphite,diamond,fullerenes,carbine, and others.

关键词： Plasma properties Carbon dioxide microwave generation Discharges Plasma materials processing Organic materials microwave devices Plasma chemistry Plasma devices Diamond-like carbon

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microwave component mechanics

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1000年

作者： Harri Eskelinen Pekka Eskelinen.

Includes bibliographical references and index.

ISBN: (纸本)158053368X (alk. paper)

Includes bibliographical references and index.

关键词： microwave devices

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