Design of Quasi-optical Components for Millimeter to THz Vacuum Electron Beam Devices PDF Download
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Author: John Jiang Yan
Publisher:
ISBN: 9781267760364
Category :
Languages : en
Pages :
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Book Description
With the emergence of high power, millimeter wave sources operating at 94 GHz and 220 GHz with output powers in excess of 10 kW and 50 W, respectively, creates a critical need to route and process these powers efficiently. Since fundamental mode waveguides become unreasonably lossy and run into the breakdown regime to handle these associated powers when operating at the millimeter wave to terahertz regime, quasi-optical techniques, which utilize higher beam modes and common optical techniques, are employed. Such techniques typically require stringent mode control and call for intercoupling wave propagation analysis to minimize mode conversion. These complicated analysis techniques stretch the capabilities of traditional differential equation formulations typically employed to analysis complex structures in the microwave regime. Additionally, these structures become electrically large due to the shrinking associated wavelengths of the propagating waves in the millimeter wave to terahertz spectrum making such analysis difficult-to-impossible under 'normal' computing conditions. To intelligently design and manufacture these components, the multiphysics behavior of these devices must be carefully understood. As a result, circuit models and quick solver methodologies are presented and used to analyze these electrically large systems. As a result of careful signal integrity engineering, quasi-optical components and systems are designed and the experimental results are presented to extract empirical values, benchmark numerical solutions, and for practical use. As a result of these studies, one can conclude that quasi-optical signal processing and overmoded transmission line systems are essential to efficiently process the high powers fields radiating from the described vacuum electron beam devices for next generation telecommunication, remote sensing, scientific instrumentation, and electronic warfare systems.
Author: John Jiang Yan
Publisher:
ISBN: 9781267760364
Category :
Languages : en
Pages :
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Book Description
With the emergence of high power, millimeter wave sources operating at 94 GHz and 220 GHz with output powers in excess of 10 kW and 50 W, respectively, creates a critical need to route and process these powers efficiently. Since fundamental mode waveguides become unreasonably lossy and run into the breakdown regime to handle these associated powers when operating at the millimeter wave to terahertz regime, quasi-optical techniques, which utilize higher beam modes and common optical techniques, are employed. Such techniques typically require stringent mode control and call for intercoupling wave propagation analysis to minimize mode conversion. These complicated analysis techniques stretch the capabilities of traditional differential equation formulations typically employed to analysis complex structures in the microwave regime. Additionally, these structures become electrically large due to the shrinking associated wavelengths of the propagating waves in the millimeter wave to terahertz spectrum making such analysis difficult-to-impossible under 'normal' computing conditions. To intelligently design and manufacture these components, the multiphysics behavior of these devices must be carefully understood. As a result, circuit models and quick solver methodologies are presented and used to analyze these electrically large systems. As a result of careful signal integrity engineering, quasi-optical components and systems are designed and the experimental results are presented to extract empirical values, benchmark numerical solutions, and for practical use. As a result of these studies, one can conclude that quasi-optical signal processing and overmoded transmission line systems are essential to efficiently process the high powers fields radiating from the described vacuum electron beam devices for next generation telecommunication, remote sensing, scientific instrumentation, and electronic warfare systems.
Author: Anisullah Baig
Publisher:
ISBN: 9781303537622
Category :
Languages : en
Pages :
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Book Description
The millimeter wave to THz region (0.1 - 1 THz) of the electromagnetic spectrum possesses unique properties which lead to potential applications ranging from non-intrusive security, high data rate communications, medical imaging, and industrial quality control. However, the unavailability of oscillators/amplifiers with adequate power in a compact package has led to the expression "THz Gap". Microwave Vacuum Electron Device (MVED) technology is considered by many to be the most promising approach for a THz source. The main focus of this dissertation has been in conjunction with the DARPA (Defense Advanced Research Project Agency) HiFIVE (High Frequency Integrated Vacuum Electronics) 220 GHz program. Some supportive work has also been conducted in support of W-band Sheet Beam Klystron and 94 GHz Gyrotron development efforts. A complete MEMS (micro-electro-mechanical-systems) process was developed to precision fabricate micro-metallic staggered vane waveguides 400 [mu]m tall and with the shortest cavity of 75 [mu]m in a single layer process. MEMS fabricated 220 GHz, Traveling Wave Tube Amplifier (TWTA) circuits were demonstrated with unprecedented results of RF transmission S21 ~ - 6 dB in a pass band 214 - 266 GHz, corresponding to a bandwidth > 50 GHz. 3D electromagnetic wave, particle dynamics and beam-wave interaction simulation codes were utilized for realistic device design and modeling of fabrication errors. Cold test measurements were conducted in the frequency range 160 - 280 GHz to characterize the TWT circuits using both a backward wave oscillator based scalar network analyzer and Agilent PNA-X. Hot test experiments were conducted for the 220 GHz TWTA with (a) no RF input, for zero drive stability analysis and (b) with RF drive. Millimeter wave frequency and power calibration/measurement techniques were employed to analyze the lower (2[pi])/upper (3[pi]) cutoff oscillations. TWTA gain was measured as a function of frequency and collector current. For the next generation compact, PCM (permanent cusp magnet) integrated TWTA approach, the complete assembly, including 220 GHz TWT circuit (19.5 kV, 200 mA), permanent magnets (NdFeB) based sheet beam transport, and RF windows was designed. The Nano-CNC fabrication has been completed and PCM is being assembled.
Author: Goldsmith
Publisher: Springer
ISBN: 9780412839405
Category : Technology & Engineering
Languages : en
Pages : 0
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Book Description
Combining a general introduction to Gaussian beams and quasioptical propagation with practical applications, Quasioptical Systems provides a state-of-the-art treatment of the design of low-loss, broadband systems at microwave to submillimeter wavelengths. The approach presented involves utilizing a beam with a Gaussian distribution of field strength perpendicular to its axis, which in turn propagates in a simple, predictable fashion.
Author:
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 810
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Book Description
Author: Machavaram V. Kartikeyan
Publisher: Springer Science & Business Media
ISBN: 3662076373
Category : Technology & Engineering
Languages : en
Pages : 234
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Book Description
Drawing on the author's wide experience, this book gives a comprehensive review of the state of the art in gyrotron technology, covering the theory, design and applications. The book includes an extensive references list which provides an excellent guide to the related literature.
Author: J.M. Chamberlain
Publisher: Springer Science & Business Media
ISBN: 940115760X
Category : Technology & Engineering
Languages : en
Pages : 412
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Book Description
A detailed study of the science, engineering and applications of terahertz technology, based on room-temperature solid-state devices, which are seen as the key technology for wider applications in this frequency range. The relative merits of electronic and optical devices are discussed and new device principles identified. Issues of terahertz circuit design, implementation and measurement are complemented by chapters on current and future applications in communications, sensing and remote surveillance. Audience: The unique coverage of all aspects of terahertz technology will appeal to both new and established workers in the field, as well as providing a survey for the interested reader.
Author: Gregory S. Nusinovich
Publisher: JHU Press
ISBN: 1421429411
Category : Science
Languages : en
Pages : 352
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Book Description
As unique sources of coherent high-power, microwave, and millimeter-wave radiation, gyrotrons are an essential part of the hunt for controlled fusion. Presently, gyrotrons are actively used for electron cyclotron resonance plasma heating and current drive in various controlled fusion reactors. These sources have been under development in many countries for more than forty years. In spite of their widespread use, however, there is as yet no single book to introduce non-specialists to this vital field. Now Gregory S. Nusinovich, an early pioneer of the gyrotron and widely regarded today as the world's leading authority on the subject, explains the fundamental physical principles upon which gyrotrons and related devices operate. Nusinovich first sets forth some "rules of thumb" that allow readers to understand gyrotron operation in simple terms. He then explores the fundamentals of the general theory of gyrotrons and offers an overview of the various types of gyro-devices, including gyromonotrons, gyroklystrons, gyro-traveling-wave tubes, and gyrotwystrons. He explains not only the theory, linear and nonlinear, but also the practical challenges that users of such devices face. This book will be of interest to undergraduate and graduate students as well as to those who develop gyrotrons or who use them in various applications. It should also appeal to plasma physicists interested in charged-particle dynamics, as well as to applied physicists needing to know more about micro- and millimeter-wave technologies.
Author: Richard G. Carter
Publisher: Cambridge University Press
ISBN: 0521198623
Category : Technology & Engineering
Languages : en
Pages : 843
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Book Description
Get up-to-speed on the theory, principles and design of vacuum electron devices.
Author: Ho-Jin Song
Publisher: CRC Press
ISBN: 9814613096
Category : Science
Languages : en
Pages : 606
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Book Description
Terahertz waves, which lie in the frequency range of 0.1-10 THz, have long been investigated in a few limited fields, such as astronomy, because of a lack of devices for their generation and detection. Several technical breakthroughs made over the last couple of decades now allow us to radiate and detect terahertz waves more easily, which has trigg
Author: University of Virginia
Publisher:
ISBN:
Category :
Languages : en
Pages : 694
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Book Description
