Waveguide system for high-power microwave pulse compression

McStravick, M. and Cross, A.W. and He, W. and Ronald, K. and Whyte, C.G. and Phelps, A.D.R. and Konoplev, I.V. and McInnes, P. (2009) Waveguide system for high-power microwave pulse compression. In: Proceedings of the IEEE International Vacuum Electronics Conference. IEEE International Vacuum Electronics Conference IVEC . Optical Society of America, New York, pp. 62-63. ISBN 978-1-4244-3500-5

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X-band passive microwave pulse compression is an interesting area of research in vacuum electronics. Applications include radar technology, plasma diagnostics etc. [1] The scientific study of producing high-power nanosecond microwave pulses, using passive sweep-frequency compression, was undertaken. Two novel helically corrugated waveguides were investigated; 3-fold and 5-fold, respectively. The 3-fold structure couples a TE1,1 travelling wave with a near cut-off TE2,1 wave producing a region far from cut-off with a large change in group velocity as a function of frequency. A 2.08 metre long copper helical waveguide was used to compress a 80ns, 5.5kW frequency-swept pulse from a high power TWT (TMD PTC6321), driven by an arbitrary waveform generator and vector signal generator, to a 1.5ns, 135kW pulse containing similar to 75% of the energy of the input pulse. To enhance the power capabilities of the microwave pulse compressor a more overmoded larger diameter 5-fold helical waveguide structure which adiabatically couples a TE3,1 traveling wave and a near cut-off TE2,2 wave was studied. Analysis of the dispersion characteristics carried out using CST MWS will be presented.