Microstrip resonator with it's high Q character is always known unsuitable for broadband designing .Efforts were made to use it in broadband equalizer designing .In this paper, a improved branch microstrip resonator with a thin-film resistor loading is analyzed, and a good matched broad-band microstrip equalizer using this structure is developed. The influence of the the resistor on the microstrip resonator is investigated through numerical simulations and experiments. By loading a thin-film resistor in the branch resonator, an adjustable quality factor and attenuation are achieved. High Frequency Structure Simulator (HFSS) is used to show them. According to the different value of the thin-film resistor, four different resistor loaded branch resonator are used to realize a 12GHz broadband microstrip equalizer which matchs the TWTA's output curve respectively. The fabricated figure, the simulation results and the measured data are also given. The simulations and experiments results show that this structure is quite suitable to construct broadband microstrip equalizer.
Abstract. The explosive risk evaluation of LPG tank under fire is important for putting forward the safety measurement, in order to improve the evaluation correctness, and the fisher fishing algorithm and the grey relational analysis are applied in it. Firstly, the explosion characteristics of LPG tank under fire are discussed. Secondly, the basic theory of fisher fishing algorithm and grey relational analysis are studied. Thirdly, explosive risk evaluation simulation of LPG tank under fire are carried out based on the comprehensive algorithm, and results show that new evaluation method can evaluate the explosive risk of LPG under fire effectively.
In this paper, we continue to study the chaotic characteristics of two curved surface mapping which forms a function in a unit area, and find that when one of the two curved surfaces is a standard curved surface and subjected to strong oscillation, and the other is randomly generate, the occurrence of chaos is more prone. Many different chaotic attractors are drawn by this method, adjusting the random surface to become subjective, the probability of chaotic attractor appearing can reach a half or more, which means that when certain conditions are meet, chaos is extremely common. Through calculating Lyapunov exponent and drawing the bifurcation diagram to analyze characteristics of chaos of the function, according to the bifurcation diagram of parameters and the Lyapunov exponent curve to look for more chaotic mapping function, a lot of chaotic attractors can be obtained. Finally a three-dimensional trigonometric function and two randomly generated three-dimensional polynomial functions are iterated, and many fancy three-dimensional attractors are obtained.
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