11

S-Pol center fedantenna

Dual Offset-Feed Gregorian Dual Offset-Feed Gregorian Antenna SystemAntenna System

Operational March 2008

33

-38 cross-pol;-40 db in practice.

First sidelobe is31 db down.

Gain

Pattern for the “old” CHILL center fed parabolic antennaFrom Bringi and Chandrasekar (2001)

The 1994 CHILL center fed parabolic antennaFrom Bringi and Chandrasekar (2001)

First side lobe is25 db down. 31 dbdown for newantenna.

Cross-pole about-35 db.