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Application of C-COM for microwave integrated-circuit modeling | IEEE Conference Publication | IEEE Xplore

Application of C-COM for microwave integrated-circuit modeling


Abstract:

The concurrent complementary operators method (C-COM) is extended for the FDTD simulation of microwave integrated circuits for the first time. Fields in the boundary laye...Show More

Abstract:

The concurrent complementary operators method (C-COM) is extended for the FDTD simulation of microwave integrated circuits for the first time. Fields in the boundary layers are computed twice with the dispersive boundary condition (DBC) and its complementary operator to truncate the FDTD lattices. The two simulations are averaged to annihilate the first order reflections from the truncated boundary. Numerical error analysis show that the reflections are further suppressed by at least 20 dB due to the implementation of complementary operators, and the setup of parameters becomes easier and more robust. A flexible and highly efficient absorbing boundary condition for guided wave problems is thus obtained through the combination of C-COM and DBC. Simulation results for a modified microstrip transmission line and a microstrip impedance transformer are given to validate this method.
Date of Conference: 02-07 June 2002
Date Added to IEEE Xplore: 07 August 2002
Print ISBN:0-7803-7239-5
Print ISSN: 0149-645X
Conference Location: Seattle, WA, USA

I. INTRODUCTION

Recently, the complementary operators method (COM) was presented as a new FDTD boundary truncation scheme [1]. This method uses two complementary boundary operators whose reflection coefficients are identically opposite. The first order reflections from the truncated boundary are canceled by performing two independent simulations. In the concurrent version of this method, termed C-COM [2], the two complementary operators are employed concurrently in the same simulation, thus the computation is reduced about one half. In C-COM, the errors caused by the first order reflection for traveling waves and evanescent waves can be annihilated completely in any directions, and the errors will only be in the order of the second order reflections. If a high quality absorbing boundary condition (ABC) is used as the fundamental operator, the errors will be very small. Using Higdon's ABC as the fundamental operator, C-COM has been utilized to simulate the radiation of line sources and scattering from perfectly conducting cylinders [1] [2]. It has been shown that the performance of this scheme is comparable with, or even superior to, that of the PML technique [3] for some applications.

References

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