Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: When Liquid Meets Frequency-Selective Rasorber: Wideband and Switchable
  3-D Frequency-Selective Rasorber   In this paper, a switchable 3-D frequency selective rasorber (FSR) with wide
absorption bands without lumped components or commercial magnetic absorbers is
presented and investigated. The absorption path is constructed by embedding a
hybrid liquid microwave absorber (MA) inside a parallel plate waveguide (PPW)
to create an extra-wide absorption band. A reflection layer based on water is
placed behind the FSR to realize the reconstruction from FSR to a band-notched
absorber (BNA) by controlling the presence or absence of water. The
liquid-based absorber is firstly analyzed by a multimode dielectric resonant
circuit and the fundamental operating principle of the FSR is demonstrated with
the help of an equivalent circuit model (ECM). A design example is provided,
fabricated, and measured and it exhibits a passband at 5.10 GHz with a
transmission bandwidth of 18.5% for less than 3 dB insertion loss and
fractional bandwidth of 146.8% with reflectivity less than -10 dB in FSR mode.
In BNA mode, it has a minimum return loss of 0.72 dB and a good absorption band
from 2.5 to 4.6 GHz and 5.7 to 16.5 GHz. Good agreements among circuit
analysis, simulation results, and measurement results are finally obtained. The
switchable rasorber can be applied in a shared-aperture antennas system to
convert a broadband stealth radome into a BNA.

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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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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: eess
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: q-alg