Experimental research of triode with virtual cathode radiation field

The results of experimental research of a triode with virtual cathode (VC) radiation field in the far-zone are given in (A. N. Didenko et al, Proc. of 3rd Int. Top. Conf. on High Power Electron and Ion Beam, v.2, p.683-691,1979). Power flux density and frequency dependences upon radiation direction at different time moments of pulse generation are obtained. It is shown that radiation from the triode with a VC has a radiation pattern of complex shape with a different frequency composition. In this work, the measurements of the power flux density and radiation frequency on the imaginary hemisphere in the radiation far-zone are represented. According to the measurement results, the triode radiation field in space has a complication structure and different frequency composition. This proves its multimode generation character.