Abstract
Planar broadband THz travelling wave tube is being designed for ultra broadband high speed data rate communication and imaging. A simplified analytical approach is developed for designing of a planar staggered double vane rectangular waveguide slow-wave structure (SDVSWS) for a broadband 0.22 THz 100W TWT. The structure is inherently compatible for sheet beam operation, and it is designed for an electron beam of voltage 20 kV and current 50 mA. 3D e.m. field simulator code CST-MWS was used for simulating the SDVSWS using the analytical design parameters. It is found that the dispersion characteristic by the analytical method matches well within 5% with the simulated dispersion characteristic of the structure. Effects of various parameters of a double-vane SWS on dispersion and impedance characteristics are evaluated for achieving a planar TWT of bandwidth more than 40 GHz with high gain. It is shown that pitch and vane height are most significant parameters and half-period staggering of double vanes in the structure provides wider bandwidth, high impedance and high symmetric RF electric field for efficient beam-wave interaction.
Highlights
High power terahertz frequencies from 0.1 THz to 10 THz of the electromagnetic spectrum are being explored for numerous scientific and technological applications like ultra-broadband communication, security, medical imaging, remote sensing, planetary exploration and spectroscopy [1,2,3,4,5]
Broadband high power high gain travelling wave tubes (TWTs) of 0.22 THz centre frequency is of significant importance for ultra-broadband high data rate wireless communication and imaging because of the available atmospheric spectral window over wideband from 0.20 THz to 0.30 THz
Slow-wave structure is the most critical component of a TWT because it decides the rf performance of a device
Summary
High power terahertz frequencies from 0.1 THz to 10 THz of the electromagnetic spectrum are being explored for numerous scientific and technological applications like ultra-broadband communication, security, medical imaging, remote sensing, planetary exploration and spectroscopy [1,2,3,4,5]. Ultra broadband communication and sensing applications demand extremely broad bandwidth (>10 GHz) and high power (>10 W) linear devices at THz frequencies. Efficient and compact vacuum electronic devices (VEDs) can amplify tens of watts output power at THz frequencies. Among various vacuum tube amplifiers, travelling wave tubes (TWTs) are most preferred choice as a high power THz amplifier for communication and sensing applications due to their high beam-wave energy conversion efficiency over an extremely wide bandwidth, large RF thermal capacity and high gain amplification at THz frequencies. TWTs can have amplified output power in tens of watts at such high frequencies with gain more than 20 dB and efficiency around 5-10%. The simulation results are presented in section 3. equation (1)
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