천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제42권1호
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- Pages.57.1-57.1
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- 2017
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- 1226-2692(pISSN)
Improvement and quasi optical analysis of wide band prototype feedhorn for ASTE focal plane array
- Lee, Bangwon (Korea Astronomy & Space Science Institute) ;
- Gonzalez, Alvaro (National Astronomical Observatory of Japan) ;
- Lee, Jung-won (Korea Astronomy & Space Science Institute)
- 발행 : 2017.04.10
초록
As an upgrade we report the current ASTE ultra-wideband corrugated horn design. The length of the feedhorn gets shortened from 12.5 mm to 11 mm, and it shows better side lobe level at the far-field patterns compared with the previous design. We looked into possible quasi-optical solution to match the feedhorn beam to the optics of the current ASTE telescope, starting from frequency-independent solution using two ellipsoidal mirrors to which wideband performance of the feedhorn naturally fits. We used a commercial physical optics package (GRASP) with an user-defined optimizer to give physical constraints to evaluated optical designs for highest efficiency.
키워드