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The U.S. Naval Research Laboratory has been developing a novel UV-LIGA process to create amplifier circuits from 100 GHz through the THz. A 670 GHz EIK ladder test piece has been successfully fabricated with a 0.004 inch diameter beam tunnel, and demonstrates sub-micron fabrication accuracies. The technique is being extended to showcase capabilities at 850 GHz, and 1.03, 1.35 and 1.50 THz.
The design of a W-band serpentine TWT with >200 W of power over a 4 GHz bandwidth (>100 W over 7 GHz) is presented. The amplifier is driven by a 122mA, 20 kV electron beam generated by a slightly modified version of the demonstrated 670 GHz beamstick at a reduced magnetic field. The design was performed by both the established MAGIC-3D and the recently validated NRL code Neptune, with good agreement...
We are developing a wideband 95-GHz, 200-W TWT powered by a 20-kV, 122-mA electron beam. The serpentine waveguide circuit is fabricated by UV-LIGA using an embedded monofilament, which produces an all-copper structure with beam tunnel. Simulations predict 37 dB small-signal gain and 245 W maximum output power.
We present a parallelization framework prototype for efficient physics-based computer simulation of hyperspectral time-dependent waveforms (i.e., wideband with a large number of frequency components) in nonlinear power amplifiers with memory. It relies on an adaptive algorithm for signal splitting and splicing in the time domain and uses a well-established pseudospectral multifrequency large-signal...
Wideband, distributed beam amplifiers are under development at NRL. We report on microfabrication techniques used to construct several types of millimeter wave planar amplifier circuits using Ultraviolet Lithography (UV-LIGA).
Serpentine traveling-wave tubes (TWTs) are a class of vacuum electronic devices capable of wideband (25%), high power performance. However, their bandwidth depends critically on the path length along a half-period of the serpentine waveguide (from gap to gap). At THz frequencies (200 to 1000 GHz), beam tunnel diameters well below 200 μm are required to achieve bandwidth ~20%. On this scale, fabrication...
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