  Due to heavy congestion in lower frequency bands, engineers are looking for
new frequency bands to support new services that require higher data rates,
which in turn needs broader bandwidths. To meet this requirement, extremely
high frequency (EHF), particularly Q (36 to 46 GHz) and V (46 to 56 GHz) bands,
is the best viable solution because of its complete availability. The most
serious challenge the EHF band poses is the attenuation caused by rain. This
paper investigates the effect of the rain on Q and V bands' performances in
Bangladeshi climatic conditions. The rain attenuations of the two bands are
predicted for the four main regions of Bangladesh using ITU rain attenuation
model. The measured rain statistics is used for this prediction. It is observed
that the attenuation due to rain in the Q/V band reaches up to 150 dB which is
much higher than that of the currently used Ka band. The variability of the
rain attenuation is also investigated over different sessions of Bangladesh.
The attenuation varies from 40 dB to 170 dB depending on the months. Finally,
the amount of rain fade required to compensate the high rain attenuation is
also predicted for different elevation angles.
