Generation of Ultrawide Band Electromagnetic Pulse from Blumlein Pulse Forming Line

Jin, Yun Sik;Kim, Jong Soo;Cho, Chuhyun;Roh, Young Su

  • Received : 2013.04.01
  • Accepted : 2013.11.20
  • Published : 2014.03.01


A high voltage pulse generator was fabricated to radiate ultrawide band electromagnetic pulse. A coaxial type of Blumlein pulse forming line is employed to produce a pulse of high voltage (>300 kV) and short pulse duration (~5 ns). A helical strip/wire type of air-cored pulse transformer was used to charge the Blumlein pulse forming line up to more than 300 kV. A peaking switch is essential to make the pulse rise time as fast as possible. Typically, the rise time is ~500 ps. The output pulse of the generator is radiated into air through an exponentially tapered TEM horn antenna. The electric field intensity of a radiated pulse was measured as a function of the distance from the transmitting horn as well as the output voltage of the peaking switch. The peak-to-peak value of the electric field intensity at 10 m from the TEM antenna was~100 kV/m.


Blumlein PFL;High voltage;TEM antenna;Ultrawide band;EMP


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