  In the upcoming 5G communication, the millimeter-wave (mmWave) technology
will play an important role due to its large bandwidth and high data rate.
However, mmWave frequencies have higher free-space path loss (FSPL) in
line-of-sight (LOS) propagation compared to the currently used sub-6 GHz
frequencies. What is more, in non-line-of-sight (NLOS) propagation, the
attenuation of mmWave is larger compared to the lower frequencies, which can
seriously degrade the performance. It is therefore necessary to investigate
mmWave propagation characteristics for a given deployment scenario to
understand coverage and rate performance for that environment. In this paper,
we focus on 28 GHz wideband mmWave signal propagation characteristics at
Johnston Regional Airport (JNX), a local airport near Raleigh, NC. To collect
data, we use an NI PXI based channel sounder at 28 GHz for indoor, outdoor, and
indoor-to-outdoor scenarios. Results on LOS propagation, reflection,
penetration, signal coverage, and multi-path components (MPCs) show a lower
indoor FSPL, a richer scattering, and a better coverage compared to outdoor. We
also observe high indoor-to-outdoor propagation losses.
