through again and be repulsed by the cathode and attracted towards the anode. The rapidly accelerating and decelerating electrons, as they oscillate back and forth between the real and virtual cathode through the mesh anode at microwave frequencies, then produce electromagnetic radiation. Sources , High power microwave generator using relativistic electron beam in waveguide drift tube, to Donald J. Sullivan, 1982 , "Virtual cathode microwave generator having annular anode slit," Thomas J. T. Kwan, 1988 Donald J. Sullivan, "High Power Microwave Generation From a Virtual Cathode Oscillator (Vircator)," IEEE Trans. Nucl. Sci., vol. NS-30, No. 4, 3426-3428 (Aug. 1983) Thomas J. T. Kwan, "High-Power Coherent Microwave Generation from Oscillating Virtual Cathodes," Phys. Fluids 27 (1), 228-232 (Jan. 1984) Libor DRAŽAN, Roman VRÁNA, "Axial Vircator for Electronic Warfare Applications" Energy weapons Microwave technology Vacuum tubes