  We discuss full-sky convolution of the instrumental beam with the CMB sky
signal in CMB single-dish and interferometry experiments, using the method
(Challinor et al. 2000) that the measured temperature and polarization
anisotropies are defined globally on the group manifold of the
three-dimensional rotation by means of Wigner D-functions. We re-derive the
anisotropy and polarization correlation functions incorporated with asymmetric
window functions, which are then explicitly calculated for a single-dish
elliptical Gaussian beam and an interferometric Gaussian beam.
