부산대학교 도서관

Compact, high-power, and wide band amplifiers, operating in the GHz frequency regime, have a number of important applications, ranging from rf communications with ground and airborne systems to electronic disruption. Amplifiers in this frequency range are key to achieving the necessary waveform diversity and agility for these applications. In this work the fundamental limits of the Cherenkov Maser Amplifier (CMA) in generating high-power levels over a wide frequency range is analyzed. In the CMA, a high-current, relativistic electron beam is injected and propagates in a dielectrically lined waveguide. The dielectric layer reduces the phase velocity of the hybrid TEM-TM mode of the wave guide to equal the electron beam velocity. This coupling allows for GW output powers throughout the 1–4 GHz range. Conversion efficiency can be enhanced by pre-modulating the electron beam or tapering the phase velocity along the length of the wave guide.