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In this paper we report precision MEMS Fabrication using novel LIGA technique for 0.22 THz micro-metallic staggered double-vane TWT circuits. For this high aspect ratio structure negative tone photo-resist KMPR was used. The entire fabrication process starting from spin coating, UV-lithography, electroforming and mold removal processing was fully characterized. Finally, the high tolerance TWT structure...
We report periodic permanent magnet modeling for an efficiently focused sheet beam (~7:1) transport achieved in a relatively long (40 mm) drift tube. To perform a quick pulsed device (TWT) test, it is planned for a high aspect ratio electron gun (12:1, designed by CPI1 for solenoidal field focused beam) to be used for currently designed PPM focused ~7:1 aspect ratio sheet beam, with drift tube to...
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...
In the course of the DARPA HiFIVE (High Frequency Integrated Vacuum Electronics) program, we have investigated various MEMS techniques for micro-fabrication of electronic circuits built in a 0.22 THz traveling wave tube (TWT) amplifier. The so-called “Barnett-Shin” circuit is a TE-mode waveguide structure of ultra wideband epsilon negative (ENG) metamaterial, comprised of a half-period staggered double...
A compact, high power terahertz (THz) sheet beam traveling wave tube (TWT) amplifier is being developed for communication, sensing, and imaging applications. This research is aimed at realizing MEMS fabrication/integration of a CW coherent radiation source with 1000 W-GHz power-bandwidth product. In order to achieve this goal, we investigate (1) electric negative index metamaterial (ENG, surface plasmon)...
0.22 THz sheet beam traveling wave tube amplifier (TWTA) circuits fabricated by microelectro mechanical system (MEMS) processes are under investigation for submillimeter wave applications. Currently, we are investigating three different methods; KMPR UV-LIGA and nano CNC machining. Eigenmode transient simulations show that, accounting for realistic values of our currently achievable fabrication tolerances,...
An 0.22 THz sheet beam TWT amplifier is under development in the DARPA HiFIVE program. In our prior work, FDTD-PIC simulation predicted that the plasmonic band circuit of a staggered double grating array produces 150 to 275 W, corresponding to 3-5.5% efficiency, at 0.22 THz over ~30% bandwidth with greater than 12 dB/cm growth rate, assuming a beam power of 5 kW. Subsequent Ka-band dispersion and...
A novel slow-wave vacuum electron device circuit, consisting of a half-period-staggered double-vane array and a high-aspect ratio sheet electron beam, has been conceived for a high-power wideband submillimeter-wave generation. A particle-in-cell simulation, which is based on a finite-difference time-domain algorithm, has shown that this circuit has a very wide intrinsic bandwidth (in excess of 50...
A novel slow wave vacuum electron device circuit, the so-called ldquoBarnett-Shin traveling wave tube (TWT) circuitrdquo, which consists of a half-period-staggered double vane array and a high aspect ratio sheet beam, has been conceived for high power millimeter and submillimeter wave amplification/ oscillation applications requiring extremely wide bandwidth as well as compact size and light weight...
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