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Accurate Bloch Analysis of 1-D Periodic Lines Through the Simulation of Truncated Structures

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5 Author(s)
Valerio, G. ; Dept. of Inf. Eng., Electron. & Telecommun., Sapienza Univ. of Rome, Rome, Italy ; Paulotto, S. ; Baccarelli, P. ; Burghignoli, P.
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A common approach to perform dispersive analyses of waveguides periodic along one direction is based on the electromagnetic simulation of a single spatial period of the structure. However, the resulting equivalent two-port network representation of the single cell may lead to inaccurate modal results, since mutual coupling between cells has been neglected. When a finite number of adjacent cells are simulated, with the aim of improving the accuracy of the analysis, spurious solutions are introduced; they are shown here to be related to the nonuniqueness of root-extraction operations in the complex plane. A simple automatic method is proposed to recover the correct solution and to test the convergence of the analysis as the number of simulated cells is increased.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:59 ,  Issue: 6 )

Date of Publication:

June 2011

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