Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Progress in Water-Based Metamaterial Absorber: A Review   Increasing attention on microwave ultra-broadband metamaterial absorbers has
been paid due to their promising applications. While most microwave
ultra-broadband metamaterial absorbers developed so far are based on metallic
resonant structures, dispersive dielectric water-based metamaterial opens a
simpler and more versatile route for the construction of polarization- and
angle- insensitive ultra-broadband absorption. Here, we review the recent
progresses of water-based metamaterial absorber by providing an illustration of
the mechanisms to realize ultra-broadband, tunable and multi-functional
absorption. We also address the further development direction and some
potential novel applications.

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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: astro-ph
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an