If the antenna coupler and shielding cover are closed, a
standing wave may be generated between the floor of the
coupler and the ceiling of the shielding cover. To reduce
this effect, the ceiling of the shielding cover is lined with a
foam material to attenuate the magnetic field, which is at
its maximum at the metal surface. In addition, the electric
field component is attenuated by a pyramid-shaped absorber.
The shielding cover upgrades the antenna coupler
to a high-grade RF shielded chamber that prevents interference
radiated by base stations or other neighboring test
and service sets from affecting the measurement results
of the DUT. This is particularly important in BER measurements.
The closing mechanism can easily be operated
with only one hand and ensures very high shielding effectiveness
of >50 dB by producing a defined contact pressure.