Journal ArticleDOI
An adjoint variable method for time-domain transmission-line modeling with fixed structured grids
TLDR
In this paper, a novel algorithm for efficient estimation of objective function sensitivities for time-domain transmission-line modeling (TLM) with nondispersive boundaries is presented, which is illustrated through the estimation of the sensitivities of objective functions with respect to the dimensions of waveguide discontinuities.Abstract:
We present a novel algorithm for efficient estimation of objective function sensitivities for time-domain transmission-line modeling (TLM) with nondispersive boundaries. The original electromagnetic structure is simulated using TLM. An adjoint TLM simulation that runs backward in time is derived and solved. The sensitivities of the objective function with respect to all designable parameters are estimated using only the original and adjoint simulations. Our approach is illustrated through the estimation of the sensitivities of objective functions with respect to the dimensions of waveguide discontinuities. A very good match is obtained between our sensitivity estimates and those obtained through the accurate and time-intensive central difference approximation.read more
Citations
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Journal ArticleDOI
A High-Gain Broadband Gradient Refractive Index Metasurface Lens Antenna
TL;DR: In this paper, a high-gain broadband gradient refractive index (GRIN) planar lens fed by an antipodal exponential taper slot antenna (ATSA) is presented.
Journal ArticleDOI
Sensitivity analysis with the FDTD method on structured grids
TL;DR: In this paper, an adjoint-variable approach to design-sensitivity analysis with time-domain methods based on structured grids is proposed. But it does not require analytical derivatives of the system matrices and is simple to implement with existing computational algorithms such as the finite-difference timedomain (FDTD) technique.
Journal ArticleDOI
Sensitivity analysis of scattering parameters with electromagnetic time-domain simulators
TL;DR: An efficient adjoint-variable approach to the sensitivity analysis of S-parameters obtained from full-wave electromagnetic time-domain simulations that allows the computation of the S- parameter derivatives with respect to the design variables with negligible overhead.
Journal ArticleDOI
Self-adjoint S-parameter sensitivities for lossless homogeneous TLM problems
TL;DR: A novel efficient algorithm for the estimation of S-parameter sensitivities in homogeneous and lossless transmission line modelling (TLM) problems by applying a transformation to the original TLM simulation to establish an isomorphism between the original and the adjoint problem.
Journal ArticleDOI
Theory of self-adjoint S-parameter sensitivities for lossless non-homogenous transmission-line modelling problems
TL;DR: In this article, a comprehensive theory for self-adjoint S-parameter sensitivities of non-homogenous transmission-line modelling problems is presented, for the first time, and the efficiency and accuracy of their algorithms are illustrated through a number of examples.
References
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Journal ArticleDOI
The Transmission-Line Matrix Method--Theory and Applications
TL;DR: The basic algorithm for simulating wave propagation in two- and three-dimensional transmission-live networks is derived and the introduction of boundaries, dielectric and magnetic materials, losses, and anisotropy are discussed in detail.
Journal ArticleDOI
Circuit optimization: the state of the art
John W. Bandler,S.H. Chen +1 more
TL;DR: A unified hierarchical treatment of circuit models forms the basis of the presentation, and the concepts of design centering, tolerance assignment, and postproduction tuning in relation to yield enhancement and cost reduction suitable for integrated circuits are discussed.
Journal ArticleDOI
Feasible adjoint sensitivity technique for EM design optimization
TL;DR: The adjoint variable method for frequency domain design sensitivity analysis is proposed for the optimization of wire and printed structures analyzed by the Method of Moments.
Journal ArticleDOI
Optimal design method for microwave device using time domain method and design sensitivity analysis. II. FDTD case
TL;DR: A new optimal shape design method for microwave passive devices for better performances in a broadband is proposed, which is based on vector finite element time domain (FETD) method and design sensitivity analysis (DSA).
Journal ArticleDOI
Space mapping optimization of microwave circuits exploiting surrogate models
TL;DR: A powerful new Aggressive Space Mapping (ASM) optimization algorithm is presented in this paper, which draws upon recent developments in both surrogate-based optimization and microwave device neuromodeling.