Modeling Investigation of an Ultrawideband Terahertz Sheet Beam Traveling-Wave Tube Amplifier Circuit

Autor:	Neville C. Luhmann, Young-Min Shin, John Pasour, Anisullah Baig, Paul B. Larsen, Larry R. Barnett
Rok vydání:	2011
Předmět:	Physics business.industry Oscillation Terahertz radiation Amplifier Traveling-wave tube Electronic Optical and Magnetic Materials law.invention Transverse mode Perfectly matched layer Optics law Return loss Electrical and Electronic Engineering business Passband
Zdroj:	IEEE Transactions on Electron Devices. 58:3213-3218
ISSN:	1557-9646 0018-9383
DOI:	10.1109/ted.2011.2159842
Popis:	Extensive numerical analysis has demonstrated that a terahertz (H-band) sheet beam traveling-wave tube (TWT) amplifier circuit, composed of a staggered double grating array waveguide, has very broad bandwidth (~30%) of the fundamental passband (TE mode) with a 7:1 aspect ratio sheet beam without excitation of n = 1 space harmonic backward-wave modes. Particle-in-cell (PIC) simulations utilizing MAGIC3D and CST PS predict that the designed circuit produces ~150-300-W output power, corresponding to ~3%-5.5% intrinsic electronic efficiency (~35-38-dB saturated gain from 50-mW input driving power), over ~25% bandwidth, which is in good agreement with CHRISTINE 1-D code predictions. Simulations, using a perfectly matched layer boundary (~ -30-dB return loss), show that the circuit stably operates without noticeable oscillation. With a more realistic matching condition (~ -9.5-dB return loss), it becomes unstable. However, simulations show that the incorporation of an attenuating sever with tapered conductivity suppresses the instability in tube operation.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7fcddeb9310a2c2faba2921dacc35474 https://doi.org/10.1109/ted.2011.2159842 Zobrazit plný text záznamu