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A compact, high performance staggered double grating (SDG) slow wave structure (SWS) circuit has been designed for a 263 GHz sheet beam traveling wave tube amplifier (SB-TWTA) for use in an electron paramagnetic resonance (EPR) spectrometer system being developed at UC Davis under National Science Foundation (NSF) Multidisciplinary Research Initiative (MRI) funding. By adopting a phase matching choke,...
To satisfy the growing interest in high power (∼1–200 W) THz sources, our research group has been working on various technologies to miniaturize vacuum electronic devices while keeping the power levels high and offering wide instantaneous bandwidth operation. We have manufactured two different designs of 0.22 THz circuit structures including input/output couplers to WR4 waveguide. We have used nano...
Extensive numerical analysis has resulted in the conclusion that the THz (H-band) sheet beam traveling wave tube (TWT) amplifier circuit, comprised of a staggered double grating array waveguide, has the 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...
The device components of 0.22 THz sheet beam TWT amplifier, comprised of a staggered double grating array waveguide, have been designed for broadband THz operation (~ 30 %) of the fundamental passband (TE-mode). The optimally designed input coupler has ≤1 dB insertion loss at 0.22 THz with ~ 75 GHz (34 %) 1-dB matching bandwidths. The designed RF window utilizing thin mica provides a coupling bandwidth...
To satisfy the growing interest in high power (~1-200 W) THz sources, our research group has been working on various technologies to miniaturize vacuum electronic devices while keeping the power levels high and offering wide instantaneous bandwidth operation. We are exploring several methods for manufacturing 0.22 THz circuits including LIGA, silicon DRIE, and nano machining. Manufacturing circuits...
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