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An efficiency-improved high power virtual cathode oscillator with coaxial waveguide is presented. The virtual cathode oscillation is axially excited by low magnetic field guiding annular electron beam. Electron beam pre-modulation, microwave feedback structure and coaxial diode are employed to increase the device efficiency. In S-band, this device radiates 2.4GW microwave power and over 21% efficiency...
A compact concentric array radial line slot antenna (CA-RLSA) operating at $K_{u}$ -band for high-power microwave (HPM) application is proposed in this paper. The efficiency of HPM-RLSA becomes lower as the aperture size reduces due to rotational asymmetry of the illumination. The HPM-CA-RLSA was designed to overcome this difficulty with notable power handing capacity. It is fed by circularly polarized...
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