Performance of a Nano-CNC Machined 220-GHz Traveling Wave Tube Amplifier
Autor: | John Atkinson, Calvin Domier, Anisullah Baig, Diana Gamzina, Logan Himes, Neville C. Luhmann, Takuji Kimura, Branko Popovic, Robert Barchfeld, Mark Field |
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Rok vydání: | 2017 |
Předmět: |
010302 applied physics
Engineering Klystron Preamplifier business.industry Heterojunction bipolar transistor Amplifier Electrical engineering Traveling-wave tube 01 natural sciences 010305 fluids & plasmas Electronic Optical and Magnetic Materials law.invention law 0103 physical sciences Optoelectronics Insertion loss Electrical and Electronic Engineering business Monolithic microwave integrated circuit Voltage |
Zdroj: | IEEE Transactions on Electron Devices. 64:2390-2397 |
ISSN: | 1557-9646 0018-9383 |
DOI: | 10.1109/ted.2017.2682159 |
Popis: | We report on hot test measurements of a wide-bandwidth, 220-GHz sheet beam traveling wave tube amplifier developed under the Defense advanced research projects agency (DARPA) HiFIVE program. Nano-computer numerical control (CNC) milling techniques were employed for the precision fabrication of double vane, half-period staggered interaction structures achieving submicrometer tolerances and nanoscale surface roughness. A multilayer diffusion bonding technique was implemented to complete the structure demonstrating wide bandwidth (>50 GHz) with an insertion loss of about −5 dB achieved during transmission measurements of the circuit. The sheet beam electron gun utilized nanocomposite scandate tungsten cathodes that provided over 438-A/cm2 current density in the 12.5:1 ratio sheet beam. An InP HBT-based monolithic microwave integrated circuit preamplifier was employed for TWT gain measurements in the stable amplifier operation region. In the wide-bandwidth operation mode (for gun voltage of 20.9 kV), a gain of over 24 dB was measured over the frequency range of 207–221 GHz. In the high-gain operation mode (for gun voltage of 21.8 kV), over 30 dB of gain was measured over the frequency range of 197–202 GHz. High-power tests were conducted employing an extended interaction klystron. |
Databáze: | OpenAIRE |
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