Abstract

A compact high-power ultra-wideband bipolar pulse generator based on a modified Marx circuit is designed, which is mainly composed of a primary power supply, Marx generator, sharpening and cutoff subnanosecond spark gap switches, and coaxial transmission lines. The Marx generator with modified circuit structure has thirty-two stages and is composed of eight disk-like modules. Each module consists of four capacitors, two spark gap switches, four charging inductors, and a mechanical support. To simplify the design of the charging structure and reduce the number of switches, four groups of inductors are used to charge the capacitors of the Marx generator, two of which are used for positive voltage charging and the other two for negative voltage charging. When the capacitor of each stage is charged to 35 kV, the maximum output peak voltage can reach 1 MV when the Marx generator is open circuit. The high-voltage pulse generated by the Marx generator charges the transmission line and forms a bipolar pulse through sharpening and cutoff switches. All transmission lines used for bipolar pulse generation have an impedance of 10 Ω. When the 950 kV pulse voltage generated by the Marx generator is fed into the transmission line, the bipolar pulse peak voltage can reach 390 kV, the center frequency of the pulse is about 400 MHz, and the output peak power is about 15.2 GW.

Highlights

  • High-power ultra-wideband (UWB) electromagnetic pulse has the characteristics of high power, narrow pulse width, and wide spectrum

  • Due to the characteristics of short time-domain pulse, high-power UWB electromagnetic pulse is widely used in biological effects research [4, 5] and the radar target identification technique [6,7,8]. ere are two kinds of UWB electromagnetic pulse, one is monopole pulse and the other is bipolar pulse. e energy of monopole pulse is mainly concentrated in the lowfrequency part and the radiation efficiency is low, while the radiation efficiency of bipolar pulse is high because it has no DC component

  • A compact high-power UWB bipolar pulse generator is developed based on a modified circuit structure Marx generator. e structure Marx generator consists of 32 stages, including 8 disk-shaped modules, and each module contains four submodules. e structure combines ring and line structure. e disk-shaped modules are connected in a straight line, and each submodule is connected in a ring

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Summary

Introduction

High-power ultra-wideband (UWB) electromagnetic pulse has the characteristics of high power, narrow pulse width, and wide spectrum. Due to the characteristics of short time-domain pulse, high-power UWB electromagnetic pulse is widely used in biological effects research [4, 5] and the radar target identification technique [6,7,8]. E other is to use the Marx generator to generate high-voltage pulse for driving bipolar pulse [14,15,16,17]. A compact high-power UWB bipolar pulse generator is developed based on a modified circuit structure Marx generator. E structure Marx generator consists of 32 stages, including 8 disk-shaped modules, and each module contains four submodules. Compared with the bipolar pulse generated by Blumlein line [9], the bipolar pulse generated by a single line is simpler in structure and easier in insulation design and debugging under higher-power conditions (especially when the power exceeds 10 GW)

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Control circuit
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Conclusions
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