Development of a 50 Watts Ultra-Broadband TWT

An ultra-broadband TWT have been developed in the laboratory, and the parameters are generally in accordance with the designs and simulations. In the frequency range of 2.7 GHz to 18GHz, the fundamental power can reach above 50Watts. And the current of helix is lower than 10mA while duty cycle is continuous wave. Slightly oversaturated input is beneficial to harmonic suppression at the low frequency side. At the frequency 2.7GHz, the 2nd, 3rd and 4th harmonics are -3.01dB, - 4.85dB and -8.07dB respectively.