Abstract
The applications of terahertz (THz) devices in communication, imaging, and plasma diagnostic are limited by the lack of high-power, miniature, and low-cost THz sources. To develop high-power THz source, the high-harmonic traveling wave tube (HHTWT) is introduced, which is based on the theory that electron beam modulated by electromagnetic (EM) waves can generate high harmonic signals. The principal analysis and simulation results prove that amplifying high harmonic signal is a promising method to realize high-power THz source. For further improvement of power and bandwidth, two novel dual-beam schemes for high-power 346 GHz TWTs are proposed. The first TWT is comprised of two cascaded slow wave structures (SWSs), among which one SWS can generate a THz signal by importing a millimeter-wave signal and the other one can amplify THz signal of interest. The simulation results show that the output power exceeds 400 mW from 340 GHz to 348 GHz when the input power is 200 mW from 85 GHz to 87 GHz. The peak power of 1100 mW is predicted at 346 GHz. The second TWT is implemented by connecting a pre-amplification section to the input port of the HHTWT. The power of 600 mW is achieved from 338 GHz to 350 GHz. The 3-dB bandwidth is 16.5 GHz. In brief, two novel schemes have advantages in peak power and bandwidth, respectively. These two dual-beam integrated schemes, constituted respectively by two TWTs, also feature rugged structure, reliable performance, and low costs, and can be considered as promising high-power THz sources.
Highlights
Terahertz (THz) devices are widely used in high data-rate communication systems, plasma diagnostic, hazardous material detection, medical imaging, etc
In 2011, Istok proposed a series of Backward-wave oscillators (BWOs) in which the grating line is utilized as slow wave structure (SWS)
To reduce requirement of high-performance power source and obtain pure frequency spectrum of output power, we developed a kind of THz source, named high-harmonic traveling wave tube (TWT) (HHTWT) [6,21]
Summary
Terahertz (THz) devices are widely used in high data-rate communication systems, plasma diagnostic, hazardous material detection, medical imaging, etc. In 2011, Istok proposed a series of Backward-wave oscillators (BWOs) in which the grating line is utilized as slow wave structure (SWS) These devices can deliver several milliwatts output power at 1.4 THz [10]. Compared with conventional THz signal sources, the application of high-power E-band signal source in HHTWT can input considerable signal into SWS. It can avoid input signal being interfered with and even drown out noise, which is caused by electron gun and discordance of SWS fabrication. The radiation section operates at THz band, corresponding to the fourth harmonic of input signal. IInn tthhee mmoodduullaattiioonn sseeccttiioonn,, tthhee vveelloocciittyy ooff eeleectrron beam is modulated by the E-band iinnppuutt ssiiggnnaall. Modulation Section Modu2lamtimon Section 0.322 mmmm 0.6004..3624mmmmmm 0.501.51mmmm 0.008.08mmmm
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