Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.arcetri.astro.it/~nesti/pdfs/lfi_pg10.pdf Дата изменения: Fri Aug 17 15:33:27 2001 Дата индексирования: Tue Oct 2 08:47:30 2012 Кодировка: Поисковые слова: observatory

Planck/LFI
Dual-profiled Circular Corrugated Horn Design (10) Goals:
1. 2. 3. 4. 5. Frequency: 30 GHz Bandwidth: 20% Edge taper: 30dB@22° Cross-polar level: <-25 dB Return loss: >25 dB

Features:
1. 2. 3. 4. Compactness Phase centre near to the radiating aperture Noticeable secondary lobe level in the upper frequency band Noticeable pattern differences over the band

Related notes:
1. Improved throat features for machine tool 2. Improved pattern performances


Horn profile and phase centre location:

Return loss (-S11[dB]) and cross-polar level:


Copolar pattern (27 GHz):

Copolar pattern (30 GHz):


Copolar pattern (33 GHz):

45°-cut phase pattern:
(The reference point for the phases is the 20 dB-taper phase centre)