Characteristic Mode Equations for Impedance Surfaces

Pasi Yla-Oijala; Joni Lappalainen; Seppo Jarvenpaa

doi:10.1109/TAP.2017.2772873

Characteristic Mode Equations for Impedance Surfaces

Pasi Yla-Oijala, Joni Lappalainen, Seppo Jarvenpaa

Department of Electronics and Nanoengineering

Research output: Contribution to journal › Article › Scientific › peer-review

23 Citations (Scopus)

Abstract

Characteristic mode formalism is presented for closed surfaces modelled with the impedance boundary condition (IBC). The characteristic equations are expressed in terms of the electric, magnetic and combined field integral operators (EFIO, MFIO and CFIO). Similarly as for perfectly conducting (PEC) surfaces, the modal solutions based on EFIO (MFIO) are corrupted by spurious solutions as the frequency coincides with the internal resonance frequency of a cavity with PEC (PMC) walls, whereas the CFIO-based approach gives physically correct modal solutions.

Original language	English
Pages (from-to)	487-492
Number of pages	7
Journal	IEEE Transactions on Antennas and Propagation
Volume	66
Issue number	1
DOIs	https://doi.org/10.1109/TAP.2017.2772873
Publication status	Published - Jan 2018
MoE publication type	A1 Journal article-refereed

Keywords

Boundary conditions
Characteristic modes
combined field integral equation
Eigenvalues and eigenfunctions
Impedance
impedance boundary condition
Integral equations
Mathematical model
Resonant frequency
spurious solutions
Surface impedance
surface integral equation method

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title = "Characteristic Mode Equations for Impedance Surfaces",

abstract = "Characteristic mode formalism is presented for closed surfaces modelled with the impedance boundary condition (IBC). The characteristic equations are expressed in terms of the electric, magnetic and combined field integral operators (EFIO, MFIO and CFIO). Similarly as for perfectly conducting (PEC) surfaces, the modal solutions based on EFIO (MFIO) are corrupted by spurious solutions as the frequency coincides with the internal resonance frequency of a cavity with PEC (PMC) walls, whereas the CFIO-based approach gives physically correct modal solutions.",

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AU - Jarvenpaa, Seppo

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N2 - Characteristic mode formalism is presented for closed surfaces modelled with the impedance boundary condition (IBC). The characteristic equations are expressed in terms of the electric, magnetic and combined field integral operators (EFIO, MFIO and CFIO). Similarly as for perfectly conducting (PEC) surfaces, the modal solutions based on EFIO (MFIO) are corrupted by spurious solutions as the frequency coincides with the internal resonance frequency of a cavity with PEC (PMC) walls, whereas the CFIO-based approach gives physically correct modal solutions.

AB - Characteristic mode formalism is presented for closed surfaces modelled with the impedance boundary condition (IBC). The characteristic equations are expressed in terms of the electric, magnetic and combined field integral operators (EFIO, MFIO and CFIO). Similarly as for perfectly conducting (PEC) surfaces, the modal solutions based on EFIO (MFIO) are corrupted by spurious solutions as the frequency coincides with the internal resonance frequency of a cavity with PEC (PMC) walls, whereas the CFIO-based approach gives physically correct modal solutions.

KW - Boundary conditions

KW - Characteristic modes

KW - combined field integral equation

KW - Eigenvalues and eigenfunctions

KW - Impedance

KW - impedance boundary condition

KW - Integral equations

KW - Mathematical model

KW - Resonant frequency

KW - spurious solutions

KW - Surface impedance

KW - surface integral equation method

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JO - IEEE Transactions on Antennas and Propagation

JF - IEEE Transactions on Antennas and Propagation

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ER -

Characteristic Mode Equations for Impedance Surfaces

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Keywords

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