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The Wideband Electromagnetic Pulse Generator Based on Switch Ocillator

Author: LiDan
Tutor: ZhangJianDe；YangHanWu
School: National University of Defense Science and Technology
Course: Pulsed power technology
Keywords: Switch oscillator Broadband electromagnetic pulse FDTD simulation Broadband antenna
CLC: TN782
Type: Master's thesis
Year: 2010
Downloads: 28
Quote: 1
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Abstract


As narrowband, ultra-wideband high power microwave supplement, broadband high power microwave are attracted widespread attention, miniaturized compact to achieve application requirements. Transmission line type switch oscillator is an important way to achieve broadband electromagnetic pulse generator, developed research work mechanism and physical operating characteristics of the transmission line type switch oscillator based on a quarter-wavelength transmission line type switch oscillator broadband electromagnetic pulse generator to produce a center frequency of 270MHz ~ 380MHz adjustable electromagnetic pulse generator part of the structural parameters of the output, and provide a reference for the future development of a more practical device. The main content of the paper include the following aspects: (1) compare broadband electromagnetic pulse generator and broadband antenna technology solutions through analysis to determine compact broadband source technology solutions. It uses a quarter-wavelength transmission line type switch oscillator to generate broadband electromagnetic pulse, as a self-breakdown switch oil switch, single cone antenna as a radiating antenna. It has a simple and compact structure. (2) a theoretical study of the quarter of the working mechanism of transmission line type switch oscillator. The analysis showed that the switch oscillator capable of generating a damped oscillation signal, the center frequency can be adjusted by adjusting transmission line length. Reasonable choice of the transition section of transmission line, not only can solve the problem of the switch oscillator and broadband antenna matching, output voltage can also be elevated. Circuit simulation, and verification of the above principle. (3) using electromagnetic simulation software based on the FDTD method, the simulation and analysis of the design of the coaxial feed into the single cone antenna, gives the single cone broadband antenna VSWR is less than 1.5, the radiation direction in the 0.2GHz ~ 0.8GHz The strongest angle of the axial angle of 55 ° results. By switching the oscillator output signal is fed into a single cone antenna simulation analysis, it is found that the switch Oscillator radial transfer portion directly affects the primary storage, the output signal of the center frequency and the percentage bandwidth parameters. Also given the physical image of the electromagnetic signal reflection oscillator oscillation through the full electromagnetic particle simulation of time-domain characteristics. Of the switching oscillator (4) in the electromagnetic simulation based on the withstand voltage design to optimize the device structure parameters, design outbound conductor of radius 62mm, the radius of the inner conductor of 56.8mm, the length of the switching oscillator 30mm, antenna size the diameter of the conical bottom 198mm the cone high 190mm broadband electromagnetic pulse generator. Single cone antenna calibration results show that the gain is greater than 4.2dB at 0.2GHz ~ 1.0GHz frequency range. Broadband radiation experiment, by changing the radial transmission parts, output center frequency is adjustable between 270MHz ~ 380MHz, the percentage of bandwidth in the range of 11% to 23%.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Pulse,pulse circuits > Pulse generation,pulse generator
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