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检索条件"机构=NEC Network and Sensor Systems"

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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...

引用

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

引用

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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Microholographic recording using single-sided optics with electrical beam control

Microholographic recording using single-sided optics with el...

引用

作者： Katayama, Ryuichi Komatsu, Yuichi Natsumeda, Masanao System Jisso Research Laboratories NEC Corporation Kawasaki 211-8666 Japan NEC Network and Sensor Systems Ltd. Fuchu Tokyo 183-8501 Japan

A single-sided optics with electrical beam control for microholographic recording has been proposed, and its principle has been experimentally demonstrated. The recording medium has a quarter-wave layer and a reflective layer, which makes it possible to restrict an unwanted interference during recording and to eliminate an unwanted beam during readout, thereby improving the recording and readout performances. Liquid crystal deflectors and liquid crystal variable-focus lenses were used for electrical beam control, which leads to high reliability and low power consumption. The former and the latter move the focal position in the in-plane and vertical directions, respectively. Three bits were successfully recorded and read out in both the in-plane and vertical directions. Future work includes the development and demonstration of a coaxial single-sided optics, which features robustness and simplicity. © 2010 The Japan Society of Applied Physics.

关键词： Liquid crystals

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K-Band Helix TWT for NASA Artemis Project 23

K-Band Helix TWT for NASA Artemis Project

引用

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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UNDERWATER NAVIGATING BODY DETECTION DEVICE AND UNDERWATER NAVIGATING BODY DISABLING DEVICE

UNDERWATER NAVIGATING BODY DETECTION DEVICE AND UNDERWATER N...

引用

作者： KOBAYASHI TETSUYA SHIMAZU SADAO

标准号: JP2018079791(A)

PROBLEM TO BE SOLVED: To provide an underwater navigating body detection device for surely detecting an underwater navigating body of a wake-forming ***: An underwater navigating body detection device includes: a capture net;a towing rope;a towing rope attachment unit;a capture net approach detection unit;and an underwater navigating body approach determination unit. The capture net is a net to be towed by the towing rope attached to the vessel by the towing rope attachment unit and the capture net is for capturing the underwater navigating body approaching from behind the vessel. When the vessel is navigated, since the towing rope is in a tensioned state, the distance between the towing rope attachment unit and the capture net is approximately constant. Here, when the underwater travelling body approaches the vessel from behind, the capture net is pushed in the navigating direction of the vessel and the capture net approaches the towing rope attachment unit. A capture net approach amount measuring unit measures this approach amount. The underwater navigating body approach determination unit monitors this approach amount and determines that the underwater navigating body has approached when a prescribed threshold is *** DRAWING: Figure 1

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MICROWAVE TUBE AND COLLECTOR OF THE SAME

MICROWAVE TUBE AND COLLECTOR OF THE SAME

引用

作者： SHIRAI HIDEO

标准号: JP2017228424(A)

PROBLEM TO BE SOLVED: To realize a microwave tube which has a small size and high reliability, and a collector of the microwave ***: A collector used for a microwave tube is constructed by a high frequency circuit part that amplifies a high frequency by a multi action of an electron gun part discharging the electron beam and the electron beam and a collector that collects the electron beam. The collector comprises: a vacuum envelope formed by a cylindrical conductive material;a cylindrical insulation ceramic of which an inner circumference is inscribed to the vacuum envelope;a cylindrical conductive pipe of which the inner circumference is inscribed to the insulation ceramic;and a conductive collector electrode which is welded to the conductive pipe in a welding part where an outer shape is formed in an almost cylinder, and is smaller than a half of an outer periphery of the almost cylinder, in which the outer periphery other than the welding part is not contacted with the conductive pipe during non-operation of the microwave tube, and at least one part of the outer periphery other than the welding part is contacted with the conductive pipe during the operation of the microwave *** DRAWING: Figure 10

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HOUSING STRUCTURE

HOUSING STRUCTURE

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作者： KIKUCHI HARUNOBU

标准号: JP2018170467(A)

PROBLEM TO BE SOLVED: To realize a sealed housing which can achieve high cooling efficiency and high density mounting with a simple ***: A housing structure has housings. The housing structure has cooling structures. The housing structure has pipes. That is, the housing structure has the housings, the cooling structures, and the pipes. The multiple housings of the housing structure allow devices to be attached therein. The cooling structures of the housing structure are provided in at least parts of outer peripheral surfaces of the multiple housings. The pipes of the housing structure connect the multiple *** DRAWING: Figure 1

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SONAR DEVICE AND METHOD FOR DETECTING OBJECT BY THE SONAR DEVICE

SONAR DEVICE AND METHOD FOR DETECTING OBJECT BY THE SONAR DE...

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作者： SATO SHOICHI SHIMAZU SADAO

标准号: JP2017194279(A)

PROBLEM TO BE SOLVED: To reduce labors for reducing adjusting the sound pressure level and the reception sensitivity of transmission ***: A sonar device 100 includes: a transmission system circuit 101 for transmitting a transmission wave into water;a reception system circuit 103 for receiving a sound wave in the water and detecting an echo as the transmission wave reflected by an object in the water, from a reception wave;a control circuit 105 for outputting a transmission wave transmission instruction to the transmission system circuit 101 and then detecting an object in the water based on whether the echo has been detected by the reception system circuit 103;and a transmission system storage unit 102 for storing a transmission correction value for correcting the sound pressure level of the transmission wave. The transmission system circuit 101 transmits a transmission wave of the sound pressure level corrected by the transmission correction value in advance when receiving the transmission *** DRAWING: Figure 1

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SURVEY DEVICE, SURVEY METHOD, AND PROGRAM

SURVEY DEVICE, SURVEY METHOD, AND PROGRAM

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作者： MOCHIZUKI TAKAYUKI SHIMAZU SADAO

标准号: JP2018146399(A)

PROBLEM TO BE SOLVED: To provide a survey device, a survey method and a program for underway sailing objects, with which it is possible to precisely and efficiently discriminate a protrusion existing on the sea ***: A survey device 100, designed to survey an underwater sailing object, comprises a signal detection unit 10 and a signal discrimination unit 20. The signal detection unit 10 detects, as a signal, an acoustic echo derived from an explosion sound emitted from a sounding bullet thrown down to the sea floor as it is echoed by a protrusion on the sea floor. Meanwhile, the signal discrimination unit 20 determines, from the result of frequency analysis of the detected signal, whether a resonance sound caused to occur by a space filled with gases is included in the acoustic echo, and thereby discriminates whether or not the protrusion on the sea floor is an underwater sailing object. At this time, it is determined that the resonance sound is included when, with regard to the material of an airtight chamber of the assumed underwater sailing object, the signal strength of a frequency band equivalent to a wavelength that is twice the estimated length of the airtight chamber is larger than other frequency *** DRAWING: Figure 1

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SWITCH MECHANISM AND MANUFACTURING METHOD OF THE SAME

SWITCH MECHANISM AND MANUFACTURING METHOD OF THE SAME

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作者： AIZAWA TETSUO KANEMOTO YO

标准号: JP2017152254(A)

PROBLEM TO BE SOLVED: To provide a switch capable of being easily operated, which can be properly used in ***: A switch mechanism comprises: a housing having an opening part;a pressing force type switch which is arranged in an inner part of the opening part;a push button cover which is arranged so as to over the opening part on an outer side of the housing, and is made of a soft material projected and formed to a direction opposite to the switch;and a cover plate which is integrally formed with the push button cover and is fixed to the housing. The push button cover comprises a projection part for pressing the switch in which the side surface part has a rotor shape expanding outwardly from top to bottom, and which is projected from the inner side of an upper surface part of the push button cover toward the direction of the switch. A distance from a tip surface of the projection part facing an upper surface of the switch to the upper surface of the switch is larger than a displacement magnitude of the projection part in a state where almost even weight is operated to the upper surface part and side surface part of the push button *** DRAWING: Figure 1

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