The receiver temperature has two main contributions.
to
.
shows the variations of the dichroic
receiver temperature as a function of the radio frequency. This
contribution has a non-negligible contribution to the overall receiver
temperature budget. We thus only add it when in dual band mode. Moreover
it varies much as a function of the radio frequency. We thus model it as
the sum of a linear contribution, plus a Gaussian centered around
240 GHz. This last bump corresponds to a physical phenomenon, named Wood
anomaly, which occurs in the dichroic when it operates in reflection
under oblique incidence.