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Central adjoint variable method for sensitivity analysis with structured grid electromagnetic solvers

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3 Author(s)
S. M. Ali ; Dept. of Electr. & Comput. Eng., McMaster Univ., Hamilton, Ont., Canada ; N. K. Nikolova ; M. H. Bakr

Recently, approximate adjoint sensitivity techniques with structured-grid electromagnetic solvers have been proposed. In this letter, we propose a central adjoint sensitivity formula for response sensitivity with structured-grid solvers, whose accuracy is an order higher than that of the preceding techniques. The formula is derived from a backward problem, which is considered here for the first time, and the forward problem utilized in the previous techniques. Our technique maintains the computational efficiency typical for adjoint-based methods. We illustrate it through applications with a frequency-domain transmission line method solver.

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IEEE Transactions on Magnetics  (Volume:40 ,  Issue: 4 )