Switched Oscillators and Their Integration Into Helical Antennas

In this paper, the problem of designing switched oscillators at four different frequencies (200, 300, 400, and 500 MHz) has been addressed. These oscillators are quarter-wavelength long coaxial transmission lines with a nitrogen spark gap switch at one end. Two of these switched oscillators at 200 a...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2010-06, Vol.38 (6), p.1411-1426
Main Authors: Giri, D V, Tesche, Frederick M, Abdalla, Michael D, Skipper, Michael C, Nyffeler, Markus
Format: Article
Language:English
Subjects:
Antennas
Bandwidth
Bandwidths
Battery
Coaxial components
Electric potential
Electric power lines
Frequencies
Frequency
Helical antenna
Helical antennas
helix impedance
Nitrogen
Oscillators
Plasma
Power transmission lines
radiation patterns
spark-gap
Sparks
switched oscillator
Switches
Testing
Transmission lines
Voltage
Voltage-controlled oscillators
Waveforms
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Summary:In this paper, the problem of designing switched oscillators at four different frequencies (200, 300, 400, and 500 MHz) has been addressed. These oscillators are quarter-wavelength long coaxial transmission lines with a nitrogen spark gap switch at one end. Two of these switched oscillators at 200 and 500 MHz with a charge voltage of 30 kV have also been fabricated. These two oscillators are modeled using PSpice and their output into a 100 Ω load is estimated and tested by fabricating a 100 Ω transmission line. Use is made of a modified commercial helical antenna with a bandwidth of 400-600 MHz and a switched oscillator has been integrated into this helical antenna. Measurements have been made of the S 11 , the voltage into the antenna, and also the transient fields at two distances. Indeed, starting from electrical power from a 12 V battery, electrical field strengths in excess of 10 kV/m with damped sinusoidal waveforms at 500 MHz (for example) have been demonstrated.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2010.2047657