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State of the art TWT technology ~Leading the world with millimeter wave satellite communications~ 27

State of the art TWT technology ~Leading the world with mill...

27th Ka and Broadband Communications Conference and the 39th International Communications Satellite systems Conference, ICSSC 2022

作者： Kosugi, Naofumi Stewart, Travis Mori, Yoshinori Machida, Tetsuo NEC Network and Sensor Systems Ltd. 1120 Shimokuzawa Chuo-ku Kanagawa Sagamihara Japan NEC Corporation of America CA95054 United States

The growth of technology has been greater in the last ten years than the previous ten years, or any of the decades prior. Mankind ability to imagine products and services that bring solutions to societies needs is key to the growth of technology. Ideas that sometimes originate in science fiction stories come to reality through the accumulated growth and application of many technologies. Ideas, such as satellites, and Satellite Communications. The movement of information, communications, has evolved significantly. Today, audio, video, and other forms of information are moved through electronic communication on the World Wide Web as well as secure private networks. A massive global infrastructure of equipment provides the foundation to the information superhighway. Satellite Communications is at the core of this infrastructure and has been a key part of the growth of technology and the global movement of digitized information. Satellite Communications technology has evolved significantly over the last several decades and is expected to continue as global demand for the movement of information increases. The connected world is demanding faster access for the movement of data, consisting of larger files that are of greater digital density. The result is an increasing demand for bandwidth in the infrastructures that power the world of communications. The term "bandwidth" is used here to refer the bandwidth allocated to application. The Traveling Wave Tube (TWT) Has been the primary source of Electromagnetic (EM) as known as RF amplification within transmitters for decades and will continue to play a key and pivotal role into the future as the technology is alive and thriving throughout the industrial world today. As the global demand for communications traffic, the Satellite Communications industry has migrated to higher frequencies where more contiguous bandwidth is available to fulfil the demands. Operations in C-band and Ku-band, with less than a gigahertz of bandwidt

关键词： Bandwidth

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Q-band 190W Helix TWT with Two Stage Collector 23

Q-band 190W Helix TWT with Two Stage Collector

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23rd International Vacuum Electronics Conference, IVEC 2022

作者： Higashibata, Sosuke Kosugi, Naofumi Matsumoto, Daiki Munehiro, Takatsugu MacHida, Tetsuo Mori, Yoshinori Nakajima, Kenji Stewart, Travis Nec Network and Sensor Systems Ltd Engineering Department Kanagawa252-5298 Japan Nec Corporation of America Business Development Department CA95054 United States

Q-band satellite communications are increasing daily, utilizing high data rate capabilities, and broad bandwidth. nec network and sensor systems, Ltd. (NETS) has developed a new high power, broad-band, Q-band TWT that... 详细信息

ISBN: (纸本)9781665443258

关键词： Millimeter waves

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K-Band Helix TWT for NASA Artemis Project 23

K-Band Helix TWT for NASA Artemis Project

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23rd International Vacuum Electronics Conference, IVEC 2022

作者： Nishioka, Miki Kosugi, Naofumi Matsumoto, Daiki Munehiro, Takatsugu MacHida, Tetsuo Mori, Yoshinori Nekejima, Kenji Stewart, Travis Nec Network and Sensor Systems Ltd. Engineering Department Kanagawa252-5298 Japan Nec Corporation of America Business Development Department CA95054 United States

ISBN: (纸本)9781665443258

nec network and sensor systems, Ltd. has developed a K-band (22.5-23.5GHz) 400Wpeak/300Wcw Traveling Wave Tube (TWT). This paper outlines the challenges for the K-band TWT development, and the development process and key methods implemented to develop a robust and reliable TWT without the need for trial production with proto-type models. © 2022 IEEE.

关键词： Traveling wave tubes

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Volcano-structured Double-gated Field Emitter Arrays;Emission Characteristics and Applications 24

Volcano-structured Double-gated Field Emitter Arrays;Emissio...

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24th International Vacuum Electronics Conference, IVEC 2023

作者： Mimura, Hidenori Neo, Yoichiro Nagao, Masayoshi Tsutaki, Kunio Kajikawa, Yoshihiro Munehiro, Takatsugu Research Institute of Electronics Shizuoka Uiversity Hamamatsu Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan NEC Network and Sensor Systems Ltd. Microwave Tubes Division Sagamihara Japan

ISBN: (纸本)9781665473217

Volcano-structured double-gated field emitter arrays (VDG-FEAs) have realized both highly focusing electron beam and high emission current. The prototype image sensor using Spindt-type VDG-FEA has obtained a reproduced image with uniform image intensity without magnetic focusing. we describe a compact image sensor using the VDG-FEA. We are developing a 300 GHz band traveling wave tube (TWT) using a thermal cathode. We believe that the VDG-FEA is a promising cathode for the 300 GHz TWT in the future. © 2023 IEEE.

关键词： Field emission

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PILLBOX-TYPE RF WINDOW AND MANUFACTURING METHOD THEREFOR

PILLBOX-TYPE RF WINDOW AND MANUFACTURING METHOD THEREFOR

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作者： Naofumi KOSUGI Kenji NAKAJIMA

标准号: US20220384926(A1)

A pillbox-type RF window having an input/output window in a microwave tube, the pillbox-type RF window includes a disc-shaped member having a metallization layer formed on an outer peripheral portion of a disc-shaped ceramic body;a pair of ring-shaped members constituted by metal bodies having substantially the same outer diameters as the disc-shaped member, arranged to sandwich the disc-shaped member from both sides, and integrated with the outer peripheral portion of the disc-shaped member;a tube-shaped member constituted by a metal body having an inner diameter substantially equal to the outer diameters of the pair of ring-shaped members and the disc-shaped member, for holding the pair of metal components and the disc-shaped member on an inside thereof;and a restriction member for suppressing rotation between the ring-shaped members and the tube-shaped member.

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Development of Extended Q-band 200W Helix TWT with Two Stage Collector

Development of Extended Q-band 200W Helix TWT with Two Stage...

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International Conference on Vacuum Electronics

作者： Sosuke Higashibata Naofumi Kosugi Takatsugu Munehiro Tetsuo Machida Yoshinori Mori Kenji Nakajima Travis Stewart NEC Network and Sensor Systems Ltd. Shimokuzawa Chuo-ku Sagamihara Kanagawa Japan NEC Corporation of America Silicon Valley Design Center San Jose CA USA

Demand for Q-band satellite communications are increasing daily, utilizing high data rates and wide bandwidth. nec network and sensor systems, Inc. (NETS.) has developed a new high-power, wideband, Q-band TWT operatin... 详细信息

ISBN: (数字)9798350348705

ISBN: (纸本)9798350348712

关键词： sensor systems Broadband communication Vacuum electronics Reliability Electron sources Wideband Satellite communications

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Extended V-Band Helix TWT for Future High Throughput Satellite Uplink Applications

Extended V-Band Helix TWT for Future High Throughput Satelli...

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International Conference on Vacuum Electronics

作者： Naofumi Kosugi Sosuke Higashibata Tetsuo Machida Takatsugu Munehiro Yoshinori Mori Travis Stewart NEC Network and Sensor Systems Ltd. 1120 Shimokuzawa Chuo-ku Sagamihara Kanagawa Japan NEC Corporation of America Silicon Valley Design Center San Jose CA USA

ISBN: (数字)9798350348705

ISBN: (纸本)9798350348712

nec network and sensor systems, Ltd. has developed extended V-band (47.2 - 52.4GHz) 250W peak 150W cw TWT(Traveling-Wave-Tube) with 2-stage collector. This was accomplished with attention to detail in the design of performance and reliability in support of future VHTS(Very High Throughput Satellites) uplink application. This paper presents the summary of this development, which is based on nec's standard V-band (47.2 - 51.4 GHz) TWT[1].

关键词： Satellites Seals Throughput Reliability engineering sensor systems Vacuum electronics Electron sources Uplink Standards Radio spectrum management

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Q-band 190W Helix TWT with Two Stage Collector

Q-band 190W Helix TWT with Two Stage Collector

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International Conference on Vacuum Electronics

作者： Sosuke Higashibata Naofumi Kosugi Daiki Matsumoto Takatsugu Munehiro Tetsuo Machida Yoshinori Mori Kenji Nakajima Travis Stewart Engineering Department NEC Network and Sensor Systems Ltd Kanagawa Japan Business Development Department NEC Corporation of America CA USA

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K-Band Helix TWT for NASA Artemis Project

K-Band Helix TWT for NASA Artemis Project

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International Conference on Vacuum Electronics

作者： Miki Nishioka Naofumi Kosugi Daiki Matsumoto Takatsugu Munehiro Tetsuo Machida Yoshinori Mori Kenji Nekejima Travis Stewart Engineering Department NEC Network and Sensor Systems Ltd. Kanagawa Japan Business Development Department NEC Corporation of America CA USA

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Development of 30 kW-Class X-Band Solid State Power Amplifier for the Misasa Deep Space Station

NEC Technical Journal

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nec Technical Journal 2021年第1期16卷 158-161页

作者： Nakahara, Toshihaya Yamada, Youhei Otake, Toshiya Asao, Hiroyuki Izukura, Kenji Kohigashi, Kousuke Space Systems Division Japan Radio & Sensor Engineering Department Technology Development Division NEC Network and Sensor Systems Ltd Japan Radio & Sensor Engineering Department Technology Development Division Japan Structural Design Engineering Department Technology Development Division NEC Network and Sensor SystemsLtd Japan

Under contract with the Japan Aerospace Exploration Agency (JAXA), nec Corporation has delivered a 30 kW-class X-band solid state power amplifier to the Misasa Deep Space Station (Ground station for deep space exploration and telecommunication: GREAT) located in Saku City, Nagano Prefecture. To date, klystrons have been used for the high power X-band transmitters required for deep-space probe operations, but nec has succeeded in implementing the world’s first X-band solid state power amplifier in the 30 kW-class by multiple-stage combining of power amplification units using domestically produced gallium nitride (GaN) devices. © 2021 nec Mediaproducts. All rights reserved.

关键词： Gallium nitride

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