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An HPM System Based on Klystron and Radial Line Helical Array Antenna

An S-band high power microwave generation and radiation system with a center frequency of 2856 MHz based on conventional high power klystron and rectangular helical array antenna fed from a radial waveguide has been fabricated and tested for both high average power and high peak power requirements. The klystron providing a peak power of 50 MW can run stably at modest repetitive pulse in pulse durations of several microseconds level, especially with good phase stability suited to power combining. The helical array antenna is composed of 16×16 helixes used as radiation elements. A radial line power divider using probe coupling is adopted to realize the equal-amplitude in-phase multiport power division of the high power microwave from the klystron.