Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetic-Power-based Characteristic Mode Theory for Perfect
  Electric Conductors   In this paper, an ElectroMagnetic-Power-based Characteristic Mode Theory
(CMT) for PEC systems (PEC-EMP-CMT) is built. The PEC-EMP-CMT is valid for the
PEC systems which are surrounded by any electromagnetic environment, and it can
construct the complex characteristic currents and non-radiative Characteristic
Modes (CMs). In this paper, some traditional concepts, such as the system input
impedance and modal input impedance etc., are redefined; the traditional
characteristic quantity, Modal Significance (MS), is generalized; a series of
new power-based CM sets are introduced. It is proven in this paper that various
power-based CM sets of a certain objective PEC structure are independent of the
external environment and excitation; the non-radiative space constituted by all
non-radiative modes is identical to the interior resonance space constituted by
all interior resonant modes of closed PEC structures, and the non-radiative CMs
constitute a basis of the space. Based on above these, the normal Eigen-Mode
Theory (EMT) for closed PEC structures is classified into the PEC-EMP-CMT
framework. In addition, a variational formulation for the external scattering
problem of PEC structures is provided in this paper, based on the conservation
law of energy.

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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th