Demonstration of a Ku-Band Continuous Wave Tunable Klystron With Tuning Range of 1.2 GHz

This article introduces the design and experimental study of a Ku-band continuous wave tunable klystron. The device mentioned above adopts a single electron beam and six tunable resonant cavities, it operates at a cathode voltage of 9.5 kV, and the cathode emission current is 1.05 A with an axial guiding magnetic field of 0.34 T. To reduce the heat dissipation of the collector and improve the efficiency, the device adopts a four-stage depressed collector design, and the collector adopts forced air cooling for heat dissipation. Finally, the assembled sample tube is tested in detail. The dc beam transmission is over 99% and the high-frequency beam transmission rate is above 97%. The device can output continuous wave power of over 2.6 kW in 1.2-GHz tuning frequency range, with 1-dB instantaneous bandwidth (BW) exceeding 60 MHz at each working frequency channel. Tube gain exceeds 51 dB, and efficiency exceeds 40%. The experimental results are in good agreement with those obtained by the 1-D and 3-D simulation. The development of this device provides important technical reference for wideband mechanically tuned klystron products and has significant importance.