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This paper presents observation of oscillations in TWT simulations at a frequency close to the band edge frequency when the electron beam is not well-focused and well-aligned. The cause of the oscillations is suggested to be backward-wave oscillations.
A novel BWO based on a planar helix slow-wave structure with straight-edge connections is presented. Simulation results show that the operating frequency of the BWO varies from 15.5–20 GHz when the beam voltage is tuned from 4.5 KV to 9KV. A cylindrical annular electron beam is applied to improve the interaction between the beam and the em field.
Backward-wave oscillation is frequently a problem in TWT amplifiers that use the conventional circular helix slow-wave structure (SWS). Circular contra-wound helix SWS, proposed in the past to solve this problem, is hard to fabricate at high frequencies. In this paper, we propose a planar contra-wound planar helix SWS with potential for microfabrication. It is shown with the help of simulated dispersion...
A planar slow-wave structure (SWS) for application in traveling-wave tubes (TWTs), unconnected pair of planar helices with straight edge connections (PH-SEC), is presented here. Two versions of the unconnected pair, co-wound and contra-wound, are analyzed and compared for the first time. Analysis for both versions is carried out as special cases of a generic structure consisting of 4 parallel unidirectionally...
Molecular imprinting technology (MIT) is a new polymer composite technology which is developed in recent years. The molecular imprinted polymer (MIPs) which are prepared by MIT can be used for sensor recognition element with the highly specific recognition property. In this paper, the molecularly imprinted piezoelectric sensor which is made of the molecular imprinting technique combined with piezoelectric...
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