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Once the topology of an antenna is determined, optimization of various antenna parameters is conducted to achieve the desired objectives. A fast and effective optimization algorithm is significant to shorten the antenna design period. With the use of a comprehensive objective function which fuses multiple targets arid constraints into one single function, the antenna is optimized end-to-end by employing Bayesian optimization algorithm. Based on the online updated dataset, the Gaussian process estimates the posterior distribution of the comprehensive objective function, and afterwards acquisition function is utilized for the iteration. To demonstrate the proposed method, two antenna models are simulated and optimized. The results show that because the proposed method is implemented in an end-to-end way through a mapping from the antenna parameters to a comprehensive objective function, it can achieve better optimization results and higher optimization efficiency compared with the conventional methods. [ABSTRACT FROM AUTHOR]

Fiber materials are commonly used in sound absorption. As the raw material of fiber material, the difference of fiber parameters will determine the sound absorption performance of fiber material. In this study, polyester fiber panels with different fiber parameters are prepared. The influence of fiber cross-sectional shape, fiber fineness and fiber length on the sound absorption performance of polyester fiber panel is analyzed. The response surface methodology is adopted to optimize the fiber parameters of polyester fiber panels. The research results show that the sound absorption performance of noncircular section polyester fibers is better than that of ordinary circular polyester in the mid-frequency stage, and the polyester fiber material with flat section has the best sound absorption performance. Polyester fibers with small fiber fineness have better sound absorption performance, while fiber length has little effect on sound absorption performance. The optimal fiber parameters by response surface optimization analysis are obtained. When the fiber section is flat, the fiber fineness is 3D with fiber length of 65 mm. The average sound absorption coefficient of 8 mm thick polyester panel with 20 air cavity depth reaches 0.54. [ABSTRACT FROM AUTHOR]