Simulation Research on a Compact High Power Microwave Source Based on Gyromagnetic Nonlinear Transmission Lines

Compared with the traditional high power microwave sources based on the electronic vacuum tube, the wide-band high power microwave sources based on the Gyromagnetic NonLinear Transmission Line (GNLTL) does not need the electron beam, the confining magnetic field and the vacuum system. It is a simple, compact and solid-state scheme. It has the advantages of adjustable frequency and repetitive operation. It can not only improve the energy utilization rate, but also break through the limitation of single operation of electromagnetic pulse projectile. In this paper, the RF pulse formation dynamics and sharpening characteristics of the gyromagnetic nonlinear transmission line are analyzed in theory. The visible two-dimensional model is composed for numerical analysis of the modulated pulse waveforms in time domain and frequency domain under a varied incident voltage or a varied axial biasing magnetic field. The simulation results show that when the incident voltage increases, the modulated peak voltage grows, the modulated depth rises and then declines to some constant value, the rise time of the modulated pulse reduces and then ceases, and the central frequency augments. When the axial biasing magnetic field increases, the modulated peak voltage and the modulated depth both rises and then declines, the rise time of the modulated pulse and the central frequency both reduces and then increases.