Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental demonstration of a mmWave passive access point extender
  based on a binary reconfigurable intelligent surface   As data rates demands are exploding, 5G will soon rely on mmWaves that offer
much higher bandwidths. Yet at these frequencies, attenuation and diffraction
of waves require point to point communications with beamforming base stations
that are complex and power greedy. Furthermore, since any obstacle at these
frequencies completely blocks the waves, the networks must be extremely dense,
resulting in dramatic increase of its cost. One way to avoid this problem is to
redirect beams coming from base stations at many locations with Reconfigurable
Intelligent Surfaces, in order to increase their coverage even in cluttered
environments. Here we describe and experimentally demonstrate a binary tunable
metasurface operating at 28~GHz, based on standard PCB and off the shelves PIN
diodes. We show that it can be used as a Reconfigurable Intelligent Surface
that beamforms an incoming plane wave at a given angle to one or several
outgoing plane waves at angles reconfigurable in real time. Most importantly we
use this 20~cm$\times$20~cm reconfigurable Intelligent Surface alongside
software defined radio and up/down converters at 28~GHz, and demonstrate a
wireless link between an emitter and a receiver 10~meters away, in a non line
of sight configuration, hence proving the validity of the approach.

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The categories of this paper are: astro-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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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: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn