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In this paper, the authors present the design and implementation of a microwave oscillator circuit with ultra-fast amplitude control for an inspection system appropriate for real-time measurements of continously streaming materials. The material passing through the resonator of the oscillator changes the resonance frequency and the quality factor of the resonator. This influences the oscillation frequency...
In this paper, we present a novel ultra-fast material inspection system for continuously streaming dielectric materials, such as paper, plastic films, non-aqueous liquids etc. The material stream is being passed through a cavity resonator whose electrical parameters are altered by the presence of the material, due to its interaction with the electric field inside the resonator. The latter is employed...
In this paper, we present a novel ultra-fast system for continuously monitoring the electrical parameters of a microwave cavity resonator, which can be used to assess the complex dielectric constant of a time-variant material sample within the resonator. The resonator is excited near a selected resonance mode by a digitally generated multisine signal. A receiver system using a Fast Fourier Transform...
The paper presents a new method for designing a digital beamformer using a uniform linear (or planar) array. By employing a spatial interpolation process at the digital signal processing section, the number of antenna elements, and the corresponding RF modules, analog/digital (A/D) converters, etc., are significantly reduced, while still retaining the same main beamwidth and the same sidelobe level...
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