An adjoint variable method for sensitivity calculations of multiport devices

Recently, an adjoint variable method (AVM) for sensitivity calculations has been proposed for use with the method of moments solvers. In this paper, we extend this method to be suitable for application to multiport devices. The target objective function is usually represented in terms of the device&...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2004-02, Vol.52 (2), p.589-599
Main Authors: Soliman, E.A., Bakr, M.H., Nikolova, N.K.
Format: Article
Language:English
Subjects:
Algorithm design and analysis
Associate members
Band pass filters
Computational modeling
Design optimization
Finite difference methods
Microstrip filters
Moment methods
Transmission line matrix methods
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Summary:Recently, an adjoint variable method (AVM) for sensitivity calculations has been proposed for use with the method of moments solvers. In this paper, we extend this method to be suitable for application to multiport devices. The target objective function is usually represented in terms of the device's S-parameters. Our AVM obtains the sensitivities of the S-parameters with respect to all design variables using only one full simulation with additional overhead. This overhead is usually less than the computation time of a full simulation. An analytical expression for the adjoint excitation is derived, leading to stable sensitivities. The potential of the proposed technique is demonstrated by analyzing low-pass and bandpass filters. The results show very good agreement between the proposed AVM and the conventional finite-difference approach (FDA). Moreover, the AVM is always faster than the FDA. The speed-up factor increases as the size of the problem increases.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2003.821934