共查询到17条相似文献,搜索用时 140 毫秒
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新型高收敛隐式空间映射算法设计微波滤波器 总被引:3,自引:0,他引:3
该文介绍了一种高收敛隐式空间映射算法,改进了隐式空间映射算法中粗糙模型到精细模型之间参数映射。它加入粗糙模型参数选择过程,避免了粗糙模型优化中的假收敛情况,加快精细模型与设计目标的逼近速度。参数选择过程不需要增加精细模型的计算次数,提高了优化效率。该文通过设计一个发卡形滤波器,并与以前的隐式空间映射算法计算结果进行比较,优化得到了比指标性能更优越的结果。同时证明了新算法比旧算法具有更快的逼近速度和更高的优化效率的优点。 相似文献
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介绍了一种快速收敛空间映射算法,改进了隐式空间映射算法中粗糙模型到精细模型之间参数映射。通过增加限定参数提取的方式,减少粗糙模型的参数空间而实现粗糙模型响应高效准确逼近精细模型响应。通过设计一个交叉耦合滤波器,与之前的隐式空间算法进行比较,更容易达到优化目标,证明了限定参数提取算法具有更快的逼近速度和更高的优化效率的优点。 相似文献
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交指型微机电系统(MEMS)滤波器是采用MEMS工艺制备出的交指型结构滤波器,针对交指型MEMS滤波器电磁优化算法中存在速度慢,占用计算资源大等问题,对交指型MEMS滤波器优化设计方法进行了研究。采用主动空间映射算法,在ADS和HFSS软件中建立滤波器电路结构模型和三维结构电磁模型,并分别将它们用于主动空间映射算法所需的粗糙仿真和精确仿真,仅进行了5次精确仿真就完成了一款Ku波段滤波器的优化设计。结果表明,设计的滤波器中心频率为14 GHz,顶部损耗为1.6 dB,-1 dB带宽为2.2 GHz,满足设计指标要求,同时验证了优化设计方法的可行性。 相似文献
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将差分进化算法用于隐式空间映射(ISM)的参数提取中,并对差分进化算法中的种群更新和交叉概率因子进行了改进,可以有效解决参数提取过程中算法的假收敛及收敛速度过慢的问题,改进了隐式空间映射算法中粗糙模型(CM)与精细模型(FM)之间的参数映射的相关性,迭代次数明显减少。通过设计一个微带双频带滤波器对该算法进行了验证,该双频带滤波器的中心频率分别为2.45GHz和5.25GHz,其粗糙模型和精确模型分别在Agilent ADS和Ansoft HFSS中进行计算分析。由结果可知,在精细模型中的仿真次数明显减少,有效地提高了滤波器的设计效率。 相似文献
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考虑到传统电磁优化仿真方法的低效性,在原始空间映射算法的基础上,构造一种有效的输入一输出空间映射算法,并用于优化设计一个微带带通滤波器,其替代模型和精确模型分别采用了基于电路原理的AgilentADS和基于矩量法的全波电磁仿真软件FEKO进行计算分析。仿真结果表明,该算法能够有效增加所设计器件的优化自由度,大大减少计算机优化时间,有效提高了微波器件的设计效率。 相似文献
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Laxminidhi T. Pavan S. 《IEEE transactions on circuits and systems. I, Regular papers》2007,54(7):1481-1488
We apply ldquospace-mappingrdquo optimization for design centering high-frequency integrated continuous-time filters. By appropriately choosing the coarse model, a significant simplification of the space mapping technique is possible, since the coarse model design space is almost a translated version of the fine model design space. Graphical intuition is given for the simplified technique. A design example of a fifth-order 71.4-500-MHz constant-C scaled Gm-C Chebyshev ladder filter is presented. Measurement results from fabricated ICs are given. 相似文献
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Ke-Li Wu Rui Zhang Ehlert M. Da-Gang Fang 《Components and Packaging Technologies, IEEE Transactions on》2003,26(2):399-406
A novel explicit knowledge embedded space mapping (SM) optimization technique is presented in this paper. It generalizes the implementation procedure of the efficient SM technique by introducing a buffer space called embedded knowledge space between the original coarse model space and the fine model space, where the ingredients of the coarse model space can be completely different from those of the fine model space. Therefore, this generic scheme can be used to map the coarse model space of arbitrary physical content to the fine model space of different physical content through the embedded knowledge space that is built up with the available radio frequency (RF) circuit CAD formula. The emphasis of the application of the proposed scheme is put on the design of low temperature cofired ceramic (LTCC) RF passive circuits in this paper, along with the required CAD formulas (knowledge) for typical embedded multilayer passives. The effectiveness of the proposed new scheme is demonstrated through two design examples of LTCC lumped element band pass filters for wireless applications. The detailed procedure and flowchart of the proposed implementation scheme are also given in the paper. 相似文献
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《Microwave Theory and Techniques》2006,54(10):3721-3730
This paper presents a comprehensive approach to engineering design optimization exploiting space mapping (SM). The algorithms employ input SM and a new generalization of implicit SM to minimize the misalignment between the coarse and fine models of the optimized object over a region of interest. Output SM ensures the matching of responses and first-order derivatives between the mapped coarse model and the fine model at the current iteration point in the optimization process. We provide theoretical results that show the importance of the explicit use of sensitivity information to the convergence properties of our family of algorithms. Our algorithm is demonstrated on the optimization of a microstrip bandpass filter, a bandpass filter with double-coupled resonators, and a seven-section impedance transformer. We describe the novel user-oriented software package SMF that implements the new family of SM optimization algorithms. 相似文献
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Jun Ouyang Feng Yang Li Guan Shiwen Yang Zaiping Nie Zhiqin Zhao 《Journal of Infrared, Millimeter and Terahertz Waves》2010,31(2):162-168
Space mapping (SM) technique is applied in conformal antenna design. The main idea of this technique is to map the coarse
model of a planar layer structure microstip antenna to fine structure of a conformal antenna including platform through space
mapping. This technique is very suitable for conformal antenna optimization where long computational time is required to achieve
an accurate solution. As the convergence speed of this technique is related to the response functions, some response functions
are researching for accelerating the optimization. Two examples are studied to validate the advantages of the feasible response
functions for accelerating the convergence speed of SM technique. 相似文献
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Bakr M.H. Bandler J.W. Madsen K. Rayas-Sanchez J.E. Sondergaard J. 《Microwave Theory and Techniques》2000,48(12):2297-2306
A powerful new space-mapping (SM) optimization algorithm is presented in this paper. It draws upon recent developments in both surrogate model-based optimization and modeling of microwave devices, SM optimization is formulated as a general optimization problem of a surrogate model. This model is a convex combination of a mapped coarse model and a linearized fine model. It exploits, in a novel way, a linear frequency-sensitive mapping. During the optimization iterates, the coarse and fine models are simulated at different sets of frequencies. This approach is shown to be especially powerful if a significant response shift exists. The algorithm is illustrated through the design of a capacitively loaded 10:1 impedance transformer and a double-folded stub filter. A high-temperature superconducting filter is also designed using decoupled frequency and SMs 相似文献
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《Microwave Theory and Techniques》2009,57(2):383-394
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Bandler J.W. Mohamed A.S. Bakr M.H. Madsen K. Sondergaard J. 《Microwave Theory and Techniques》2002,50(12):2741-2750
We present a family of robust techniques for exploiting sensitivities in electromagnetic (EM)-based circuit optimization through space mapping (SM) technology. We utilize derivative information for parameter extractions and mapping updates. We exploit a partial SM (PSM) concept, where a reduced set of parameters is sufficient for parameter extraction optimization. It reflects the idea of tuning and execution time is reduced. Upfront gradients of both EM (fine) model and coarse surrogates can initialize possible mapping approximations. We introduce several effective approaches for updating the mapping during the optimization iterations. Examples include the classical Rosenbrock function, modified to illustrate the approach, a two-section transmission-line 10:1 impedance transformer and a microstrip bandstop filter with open stubs. 相似文献