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This abstract describes the design, fabrication and testing of microfabricated 100 GHz coupled-cavity backward wave oscillator (CCBWO), which is operated in space harmonics -1 at 12 kV and 50 mA with round-beam radius 0.18 mm. The RF performance has studied using 3-D electromagnetic field simulator and particle-in-cell code. The cold-test assembly has been fabricated. The complete device assembly...
For the generation of millimeter wave from vacuum electron devices, the microfabrication of an interaction circuit is one of the key factors. Two different technologies, a deep etch X-ray lithography (x-ray LIGA) and a deep reactive ion etching (DRIE), were employed for the comparative study and the realization of a backward-wave oscillator. Both methods showed accurate and reliable results, which...
Electrothermal tuning mechanisms for nanoelectromechanical resonators are demonstrated. Voltages induced by oscillation of Al/SiC nanoresonators around 10MHz in a moderate magnetic field are measured using a room-temperature tabletop setup in moderate vacuum. The dynamic range as well as the resonance frequency of the resonator can be reversibly controlled by electrothermal tuning using DC voltage...
Effects of electrothermal tuning mechanisms for nanoelectromechnical resonators are demonstrated. Voltages induced by oscillation of Al/SiC nanoresonators in a moderate magnetic filed are measured using a room-temperature tabletop setup in moderate vacuum. The dynamic range as well as the resonance frequency of the resonator can be reversibly controlled by electrothermal tuning using DC voltage. This...
Owing to its simple scheme and no magnet requirement, a reflex klystron is considered as a suitable device for a compact, high frequency vacuum electron device. There exists an effort to develop a terahertz reflex klystron, so-called nanoklystron.(H. Manohara et al., 2005). To increase the output power, our research group have devised a photonic crystal reflex klystron which employs a high-order-mode...
Our research group has designed a photonic crystal reflex klystron which employs a high-order-mode resonator and multi-electron beams. Here a photonic crystal resonator with TM330 mode is employed in a reflex klystron for X-band proof-of-principle experiment. For the electron beam generation, carbon nanotube cathode is used as multi-beam (3 times 3 beams) source.
We re-classify this two-stage and highly tapered gyro-device as distributed interaction two-cavity gyroklystron since this device has a finite interaction length at each operating frequency in a highly tapered waveguide. Here the ballistic bunching theory previously driven is used for the estimation of the maximum bunching distance for each operating frequency. The third harmonic multiplying scheme...
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