Study and Experimentation of RF Pulse Generating and Amplifying Techniques for Improving Radar Emission Characteristics

摘要

The report covers the theoretical investigations, designs, fabrication, and testing of a breadboard transmitting system for improving radar emission characteristics. The system, operating in the 2.7 to 2.9 GHz frequency band, consists of a low-level, dual-channel driver and a parallel high-power klystron amplifier stage. The technique produces a shaped pulse with a very narrow spectrum by combining the outputs of two amplifier chains. The chains amplify rectangular pulses which are phase modulated so that when they are combined in a magic-T hybrid, a shaped pulse is formed. Measurements demonstrated that the technique, with its associated equipment, achieved a majority of the specified goals, and, for the most part, the measured results agreed with the mathematical model. Measurements revealed deviations from the mathematical model which are due to gating spikes and signal noise levels. Measurements also showed that long-term drift effects may be stabilized through the incorporation of a long-time constant closed-loop servo network. This report also discusses the results obtained using a single klystron driven by a shaped output pulse from the dual-channel driver. (Author)