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An optimization approach to the frequency-domain inverse problem for a nonuniform LCRG transmission line

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2 Author(s)
Norgren, M. ; Dept. of Electromagn. Theory, R. Inst. of Technol., Stockholm, Sweden ; Sailing He

The inverse problem for a nonuniform LCRG transmission line is considered in the frequency domain. Imbedding equations for the reflection and transmission coefficients are derived through the concept of wave-splitting. An optimization approach is applied to reconstruct the line parameters as functions of the position using band-limited reflection and/or transmission data. Exact and explicit expressions for the gradients are derived, and the reconstruction algorithm (based upon a conjugate gradient method) is tested with both clean and noisy data, The problem of the nonuniqueness is also discussed

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:44 ,  Issue: 8 )