Journal ArticleDOI
Space mapping technique for electromagnetic optimization
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TLDR
In this article, the authors propose space mapping (SM) for circuit optimization utilizing a parameter space transformation, which is demonstrated by the optimization of a microstrip structure for which a convenient analytical/empirical model is assumed to be unavailable.Abstract:
We offer space mapping (SM), a fundamental new theory to circuit optimization utilizing a parameter space transformation. This technique is demonstrated by the optimization of a microstrip structure for which a convenient analytical/empirical model is assumed to be unavailable. For illustration, we focus upon a three-section microstrip impedance transformer and a double folded stub microstrip filter and explore various design characteristics utilizing an electromagnetic (EM) field simulator. We propose two distinct EM models: coarse for fast computations, and the corresponding fine for a few more accurate and well-targeted simulations. The coarse model, useful when circuit-theoretic models are not readily available, permits rapid exploration of different starting points, solution robustness, local minima, parameter sensitivities, yield-driven design and other design characteristics within a practical time frame. The computationally intensive fine model is used to verify the space-mapped designs obtained exploiting the coarse model, as well as in the SM process itself. >read more
Citations
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Journal ArticleDOI
Fast optimization, tolerance analysis, and yield estimation of H-/E-plane waveguide components with irregular shapes
TL;DR: In this article, an algorithm for wide-band optimization of H- and E-plane waveguide components with irregular shapes is presented, based on the boundary-integral-resonant-mode expansion method, used in conjunction with a variational technique.
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Two new variants of the manifold‐mapping technique
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Functional waveguide mode transformers
TL;DR: In this article, field transformers with irregular scattering elements in a rectangular waveguide are introduced as a means to achieve frequency-dependent mode conversion, mode-selective reflection, multiple mode conversion and phase shifting.
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Predictable Equation-Based Analog Optimization Based on Explicit Capture of Modeling Error Statistics
TL;DR: This paper advances a novel optimization strategy that explicitly handles the error of the model in the course of optimization, and introduces an automated method for identifying a true feasible solution through minimal relaxation of design targets.
Journal ArticleDOI
Use of Group Delay of Sub-Circuits in Optimization of Wideband Large-Scale Bandpass Filters and Diplexers
TL;DR: In this article, a new method is proposed for the design of large-scale wideband resonator-coupled bandpass filters and diplexers, which is based on dividing the structures into many sub-circuits and calculating the group delay responses of the reflection from which the coupling parameters and cavities' resonant frequencies can be extracted.
References
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Journal ArticleDOI
Microstrip filter design using direct EM field simulation
TL;DR: For the first time, minimax filter design is presented with electromagnetic simulations driven directly by a gradient-based optimizer and the results of expensive EM simulations are stored in a dynamically updated database.
Journal ArticleDOI
Huber optimization of circuits: a robust approach
TL;DR: In this article, the authors introduce an approach to robust circuit optimization using Huber functions, both two-sided and one-sided, and compare Huber optimization with l/sub 1/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18/19/20/21/22/23/24
Journal ArticleDOI
Yield-driven electromagnetic optimization via multilevel multidimensional models
TL;DR: The authors present the foundation of a sophisticated hierarchical multidimensional response surface modeling system for efficient yield-driven design that makes it possible, for the first time, to perform direct gradient-based yield optimization of circuits with components or subcircuits simulated by an electromagnetic simulator.
Proceedings ArticleDOI
Electromagnetic design of high-temperature superconducting microwave filters
TL;DR: In this article, the authors present novel approaches to electromagnetic design of high-temperature superconducting quarter-wave parallel coupled-line microstrip filters, which dramatically reduce the CPU time for the design process.
Proceedings ArticleDOI
A CAD environment for performance and yield driven circuit design employing electromagnetic field simulators
TL;DR: A CAD environment for performance and yield driven circuit design with electromagnetic (EM) field simulations employed within the optimization loop is described and microstrip structures are accurately simulated and their responses are incorporated into the overall circuit analysis.