Experimental Study of a $Ku$ -Band RBWO Packaged With Permanent Magnet

A high power microwave (HPM) device packaged with permanent magnet is realized experimentally based on a relativistic backward wave oscillator (RBWO). The experimental results show that the frequency of the $\textit {Ku}$ -band device is 16.15 GHz and the microwave power is 1.06 GW with an efficiency of about 25% in the case in which the diode voltage is 620 kV, the beam current is 6.9 kA, and the guiding magnetic flux density is 0.94 T. The result of continuous operation for 1 s at a repetition rate of 50 Hz indicates that the RBWO with permanent magnet can operate at a high repetition rate.