Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Stored Energies and Radiation Q   This paper discusses the methods for evaluating the stored electromagnetic
energies and the radiation Q for an arbitrary lossless antenna. New expressions
for the stored electromagnetic energies are derived by using the Poynting
theorem in the complex frequency domain, and they are compared with previous
theory and are validated by numerical examples. The minimization of radiation Q
is also investigated. There exists an optimal current distribution that
minimizes the radiation Q for specified antenna geometry. The optimized Q and
the optimal current distribution may be determined by solving a generalized
eigenvalue equation obtained from the Rayleigh quotient for the radiation Q.

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The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
18
The categories of this paper are: econ
16
The categories of this paper are: stat
1
The categories of this paper are: cs