Band E�ciency Emissivity Polarization E�ciency

90GHz 0.957± 0.009 0.012± 0.005 0.988± 0.004150GHz 0.941± 0.009 0.020± 0.005 0.980± 0.005

HWP

Secondary Mirror PB2 Receiver Cryostat

190cm

50cm

60 80 100 120 140 160 180Frequency [GHz]

0.5

0.6

0.7

0.8

0.9

1.0

Mod

ulat

ion

Effi

cien

cy"(

⌫)

1 plate3 plates

90GHz 150GHz

80 100 120 140 160Frequency [GHz]

0.70

0.75

0.80

0.85

0.90

0.95

1.00

Tran

smis

sion

TheoryData

90GHz 150GHz

HWP Polarization Efficiency

Unpolarized Transmission

Config "(90GHz) "(150GHz)

Single HWP 0.721 0.780AHWP 0.99± 0.01 0.99± 0.01

Stack Element Thickness [inch] Index of Refraction Loss Tangent [10�4]

Top Anti-reflection Layer: HDPE 0.015± 0.002 1.55± 0.01 0.5± 0.4Bottom Anti-reflection Layer: RO3006 0.010± 0.001 2.52± 0.01 18± 1.4

Sapphire Ordinary Axis 0.148± 0.001 3.047± 0.03 1.0± 1.1Sapphire Extraordinary Axis 0.148± 0.001 3.384± 0.03 2.0± 1.1