94 GHz High-Average-Power Broadband Amplifier.

摘要

A state-of-the-art gyro-TWT amplifier operating in the low loss TE01 mode has been developed with the objective of producing an average power of 140 kW in the W-Band with a predicted efficiency of 28%, 50dB gain, and 5% bandwidth. The primary objective is to increase the bandwidth of W-band gyrotron amplifiers to several percent by employing a stable high performance gyro-TWT circuit. The amplifier was developed for the extremely important electromagnetic W-Band for future DoD millimeter-wave applications, in particular for the WARLOC radar. Our innovative amplifier has further improved upon the characteristics of the recent NRL-industry high average power W-Band TE01 gyro-klystron and gyro- twstron amplifiers. The bandwidth has been increased by nearly an order of magnitude. The suppression of gyro-BWO oscillation was a critical factor in the design of the TErn gyro-TWT. However, it should be noted that this negative- feedback interaction can be very useful by itself. In particular, a dual mode gyro-BWO has been designed to yield high power in the W-Band over a broad bandwidth, which will provide vital capability for future ECM applications. The two tuning modes of our gyro-BWO are fast tuning by changing the cathode voltage and slow tuning by changing the magnetic field. It will utilize much of the TEO gyroTWT circuit. The tapered device is predicted to generate 10 kW near 94 GHz with over 10% tuning and 20% efficiency.