A virtual cathode oscillator with a stainless-steel mesh anode of various transparencies and wire diameters was studied experimentally for improvement of microwave power and its repetitive operations. The maximum microwave power was observed to be about 20 MW at 12 GHz for the diode voltage of 250 kV and the electron beam current of 39 kA using the anode mesh with the wire diameter of 0.22 mm and the transparency of 67 %. The microwave emission enhanced with decreasing the wire diameter as the mean beam scattering angle decreased with the smaller wire diameter. Also the increased transparency of fine mesh caused an enhancement of microwave emission. Use of mesh anode allowed us a few repetitive operations.
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