Broad-band pulse performance of short helices

Dunham, Mark E.; Light, Max; Holden, D. N.

doi:10.1109/8.467636

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Cited by 4 publications

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Radiation of high-power ultrawideband pulses with elliptical polarization by four-element array of cylindrical helical antennas

et al. 2015

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A high-power source of ultrawideband radiation with elliptical polarization of the field has been created. The source includes a monopolar pulse generator, a bipolar pulse former, a wave transformer with the power divider, and a four-element array of cylindrical helical antennas. The array was excited by bipolar pulses of the length 1 ns and amplitude 225 kV. In the experiments, the pulses of the elliptically polarized radiation with the effective potential of 440 kV and high stability at a pulse repetition rate of 100 Hz were obtained.

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Radiation of high-power ultrawideband pulses with elliptical polarization by four-element array of cylindrical helical antennas

et al. 2015

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A source of high-power pulses of elliptically polarized ultrawideband radiation

Andreev

Efremov

Koshelev

et al. 2014

Review of Scientific Instruments

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Here, we describe a source of high-power ultrawideband radiation with elliptical polarization. The source consisting of a monopolar pulse generator, a bipolar pulse former, and a helical antenna placed into a radioparent container may be used in tests for electromagnetic compatibility. In the source, the helical antenna with the number of turns N = 4 is excited with a high-voltage bipolar pulse. Preliminary, we examined helical antennas at a low-voltage source aiming to select an optimal N and to estimate a radiation center position and boundary of a far-field zone. Finally, characteristics of the source in the operating mode at a pulse repetition rate of 100 Hz are presented in the paper as well. Energy efficiency of the antenna is 0.75 at the axial ratio equal to 1.3. The effective potential of radiation of the source at the voltage amplitudes of the bipolar pulse generator equal to -175/+200 kV reaches 280 kV.

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