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Between the BICEP2 and Keck Array experiments, we have deployed over 1500dual polarized antenna coupled bolometers to map the Cosmic MicrowaveBackground's polarization. We have been able to rapidly deploy these detectorsbecause they are completely planar with an integrated phased-array antenna.Through our experience in these experiments, we have learned of severalchallenges with this technology- specifically the beam synthesis in theantenna- and in this paper we report on how we have modified our designs tomitigate these challenges. In particular, we discus differential steeringerrors between the polarization pairs' beam centroids due to microstrip crosstalk and gradients of penetration depth in the niobium thin films of ourmillimeter wave circuits. We also discuss how we have suppressed side loberesponse with a Gaussian taper of our antenna illumination pattern. Theseimprovements will be used in Spider, Polar-1, and this season's retrofit ofKeck Array.

Antenna-coupled TES bolometers for the Keck Array, Spider, and Polar-1