Microwave Pulse Compression Loops Using Magnetostatic Wave Delay Lines,
TEXAS UNIV AT ARLINGTON DEPT OF ELECTRICAL ENGINEERING
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Pulse compression systems utilizing surface acoustic wave SAW devices have been under intensive investigation for the past 10 years. These studies have concentrated primarily on linear chirps and the achievement of low time-sidelobes by appropriate amplitude weighting. Both active and passive generation have been utilized in the compression loops, and time-bandwidth products over 1000 with greater than 40 dB sidelobe suppression have been obtained. An experimental pulse compression loop has been built using a magnetostatic surface wave MSSW delay line as the compression filter and a microwave voltage controlled oscillator driven by a programmable voltage sweeper to provide the 3 GHz chirp signal. The recompressed pulse was observed at the output of the MSSW delay line using a sampling oscilloscope. This work demonstrates both theoretically and experimentally that the intrinsic MSW dispersion occurring in a simple MSSW delay line can be utilized effectively in a low loss pulse compression filter operating directly at microwave frequencies 1-20 GHz. Effects of Doppler shifts, delay line characteristics, and spectral weighting have been included. Theoretical studies indicate sidelobe suppression greater than 30 dB is attainable by using rack weighted MSW delay lines.