研究目的
Investigating the use of strip-line type antennas with transmitting coaxial cables as ultra-wideband sensors for measuring E(t)-field impulses in electromagnetic traveling-waves at free space, and compensating for the attenuation and distortion of sub-nanosecond signals caused by the cable.
研究成果
The MsO4m microstrip sensor with a 4m transmitting cable was successfully developed, demonstrating a sensitivity of 0.36 V/(kV/m), a rise-time of approximately 50 ps, and a time-gap of 4.2 ns. The study showed that compensating for cable losses by increasing sensor sensitivity is feasible, though it introduces some parasitic oscillations. The sensor's performance was validated through simulations and experiments, making it suitable for measuring sub-nanosecond pulsed electromagnetic waves.
研究不足
The main limitation is the presence of parasitic oscillations in the signal shape when measuring EMP-waves with quick fronts. The sensor's time-gap limits its application for measuring pulses longer than the time-gap.
1：Experimental Design and Method Selection:
The study involves the design and testing of microstrip-line sensors with long coaxial cables to measure sub-nanosecond pulsed electromagnetic waves. Computer models of coaxial cables are used to simulate signal attenuation and distortion.
2：Sample Selection and Data Sources:
The MsO4m microstrip sensor with a 4m cable is used for laboratory experiments. Data is collected from simulations and experimental measurements.
3：List of Experimental Equipment and Materials:
Includes the MsO4m microstrip sensor, RK50-4-21 coaxial cable, TEM-line-cell for calibration, and digital oscilloscope TMR7118 for signal recording.
4：Experimental Procedures and Operational Workflow:
The sensor is calibrated using a TEM-line-cell. The signal from the sensor is transmitted through the coaxial cable and recorded. Simulations are conducted to model the transient response of the cable.
5：Data Analysis Methods:
The data is analyzed to determine the sensor's sensitivity, rise-time, and time-gap. The effectiveness of compensating for cable losses by increasing sensor sensitivity is evaluated.
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