  Australia Telescope Compact Array (ATCA) observations in sky regions selected
to be low in foreground confusion have been used to infer limits on
arcmin-scale CMB anisotropy in total intensity and polarization. These deep
searches have, hitherto, been made using the East-West ATCA in an ultra-compact
1-D array configuration and in the highest available frequency band at 3-cm
wavelength. The ATCA is being upgraded for operation at mm wavelengths and in
2-D array configurations: the enhanced capabilities present a new opportunity
for pursuing CMB anisotropy related observations with reduced foreground
confusion and at smaller angular scales.
