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Electron BeamRadiation PatternSemiconductor DevicesMathematical TechniquesRectangular WaveguideMagnetic FieldStatistical CharacteristicsCross SectionRadio WavesFrequency CharacteristicsExperimental DataSpace ChargeElectromagnetic FieldElectric FieldI-V CharacteristicSignal ProcessingFrequency CharacteristicGain CoefficientWaveguideIntegral Equations