Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Graphene Field-Effect Transistor Based Analogue Phase Shifter for
  High-Frequency Applications   We present a graphene-based phase shifter for radio-frequency (RF)
phase-array applications. The core of the designed phase-shifting system
consists of a graphene field-effect transistor (GFET) used in a common source
amplifier configuration. The phase of the RF signal is controlled by exploiting
the quantum capacitance of graphene and its dependence on the terminal
transistor biases. In particular, by independently tuning the applied
gate-to-source and drain-to-source biases, we observe that the phase of the
signal, in the super-high frequency band, can be varied nearly 200 degrees with
a constant gain of 2.5 dB. Additionally, if only the gate bias is used as
control signal, and the drain is biased linearly dependent on the former (i.e.,
in a completely analogue operation), a phase shift of 85 degrees can be
achieved making use of just one transistor and keeping a gain of 0 dB with a
maximum variation of 1.3 dB. The latter design can be improved by applying a
balanced branch-line configuration showing to be competitive against other
state-of-the-art phase shifters. This work paves the way towards the
exploitation of graphene technology to become the core of active analogue phase
shifters for high-frequency operation.

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The categories of this paper are: quant-ph
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The categories of this paper are: econ
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The categories of this paper are: nucl-th
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The categories of this paper are: stat
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The categories of this paper are: math-ph
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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: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: physics