Two Surface Formulations for Constructing Physical Characteristic Modes and Suppressing Unphysical Characteristic Modes of Material Bodies

Lian, Renzun; Pan, Jin; Guo, Xing-Yue

doi:10.1109/compem.2018.8496683

Cited by 9 publications

(2 citation statements)

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“…Recently, a unified manner [11] to implement the approaches in [7]- [10] was introduced, but no spurious modes were found for a specific example by using the schemes in [9]- [10]. In addition, instead of using the PMCHWT equations to construct the GEE, the external EFIE or MFIE were employed to play the role, while the internal equations were used to express the dependent relation of the electric and magnetic currents [12], which was reported able to suppress spurious modes for lossless cases, but lossy cases were not tested. Besides, a finding was reported that the spurious modes generated by the PMCHWT-based TCM did not meet the boundary condition of the internal domain [13], which provided a criterion to discard the intruded modes.…”

Section: Introductionmentioning

confidence: 99%

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Variant Characteristic Mode Equations Using Different Power Operators for Material Bodies

2021

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This paper is concerned with the electromagnetic theory of characteristic modes for general homogeneous material bodies using surface integral equations (SIEs), which are computationally more efficient than using volume integral equations (VIEs). However, the generalized eigenvalue equations (GEEs) based on SIEs are prone to generate spurious or extra modes, unlike their counterparts based on VIEs. In this work, several variant SIE-based GEEs are proposed to eliminate the spurious/extra modes and improve the numerical performances. These variant GEEs share a common point that the reactive power operator related to the material domain should be removed from the left-hand sides of GEEs by explicitly enforcing the boundary condition, because it seems sensitive to incur unwanted modes. These variant GEEs are diverse in choosing the active power operator related to the material domain on the right-hand sides to suit different medium parameters, which even can be dropped directly for lossless cases. Numerical results show that these variant GEEs do not generate spurious/extra resonant modes in observed frequency range, and at least one of the variants would have acceptable numerical accuracy.INDEX TERMS Characteristic modes, material bodies, power operators, spurious modes.

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Section: Introductionmentioning

confidence: 99%

“…, as well. The GEE (C) was previously given in[12], but the others are new. Compared with (A), these variant GEEs do not contain the operator 1 X on their left-hand sides, which seems prone to incur spurious or extra modes.…”

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confidence: 99%