Oral Presentation

ASTE receiver optics design using ultra-wideband corrugated horn at combined ALMA band 7 and band 8 frequencies

Author(s): Bangwon Lee(Seoul National Univ.), Jung-won Lee(Korea Astronomy & Space Science Institute), Alvaro Gonzalez (National Observatory of Japan)

Presenter: Bangwon Lee (Seoul National Univ., KASI)

We report the detailed design of an unprecedented wideband(band7+8) corrugated feed horn in ASTE focal plane array aiming for future ALMA receiver. We have found that such design constraints as return loss, cross-polarization level, beam width and phase curvature can be controlled by optimizing critical corrugation parameters at the throat and flare region of the horn. The success of optimization manifests itself through simulated aperture efficiency over 80 % at the entire frequency range.