Short-pulse HPM measurements using a resistive sensor.

Resistive sensors for WRD250 and WRD750 double ridged waveguides are developed. Using the developed sensors, short high power microwave (HPM) pulses covering frequency ranges 2.6–7.8 and 7.5–18 GHz can be measured directly. The novelty of the proposed sensors is not only the measurement of a few ns duration HPM pulses but also the expansion of frequency bandwidth to WRD750 waveguide frequencies. The flat frequency response of the sensors is sacrificed to measure short HPM pulses, but a wide operating frequency band is still maintained. The response time of developed sensors was estimated using the time-domain reflectometry method, and by comparing the shapes of short HPM pulses registered by the sensor and microwave probe connected to the wide bandwidth oscilloscope. The measurement results show that the sensors demonstrate quite good general characteristics with a short response time of 1.05 and 0.7 ns for WRD250 and WRD750 sensors, respectively. The times of response are promising when using these sensors for measuring short monochromatic HPM pulses, the duration of which is around 5 ns. [ABSTRACT FROM AUTHOR]