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BICEP Array is a degree-scale Cosmic Microwave Background (CMB) experimentthat will search for primordial B-mode polarization while constraining Galacticforegrounds. BICEP Array will be comprised of four receivers to cover a broadfrequency range with channels at 30/40, 95, 150 and 220/270 GHz. The firstlow-frequency receiver will map synchrotron emission at 30 and 40 GHz and willdeploy to the South Pole at the end of 2019. In this paper, we give an overviewof the BICEP Array science and instrument, with a focus on the detector module.We designed corrugations in the metal frame of the module to suppress unwantedinteractions with the antenna-coupled detectors that would otherwise deform thebeams of edge pixels. This design reduces the residual beam systematics andtemperature-to-polarization leakage due to beam steering and shape mismatchbetween polarized beam pairs. We report on the simulated performance of single-and wide-band corrugations designed to minimize these effects. Our optimizeddesign alleviates beam differential ellipticity caused by the metal frame toabout 7% over 57% bandwidth (25 to 45 GHz), which is close to the level due thebare antenna itself without a metal frame. Initial laboratory measurements arealso presented.

Design and performance of wide-band corrugated walls for the BICEP Array detector modules at 30/40 GHz