  This paper presents 73 GHz human blockage measurements for a point-to-point
link with a 5 m transmitter-receiver separation distance in an indoor
environment, with a human that walked at a speed of approximately 1 m/s at a
perpendicular orientation to the line between the transmitter and receiver, at
various distances between them. The experiment measures the shadowing effect of
a moving human body when using directional antennas at the transmitter and
receiver for millimeter-wave radio communications. The measurements were
conducted using a 500 Megachips-per-second wideband correlator channel sounder
with a 1 GHz first null-to-null RF bandwidth. Results indicate high shadowing
attenuation is not just due to the human blocker but also is due to the static
directional nature of the antennas used, leading to the need for phased-array
antennas to switch beam directions in the presence of obstructions and
blockages at millimeter-waves. A simple model for human blockage is provided
based on the double knife-edge diffraction (DKED) model where humans are
approximated by a rectangular screen with infinite vertical height, similar to
the human blockage model given by the METIS project.
