Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2009-04-29
2011-11-08
Lee, John (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S339140, C250S342000, C343S721000
Reexamination Certificate
active
08053720
ABSTRACT:
Provided are a multi-frequency millimeter-wave very long baseline interferometry (VLBI) receiving system and a method of designing a quasi optical circuit for the multi-frequency millimeter-wave VLBI receiving system. The multi-frequency millimeter-wave VLBI receiving system includes a plurality of low pass filters, offset ellipsoidal mirrors, and flat mirrors for dividing a cosmic radio wave signal incident through the troposphere. A beam propagated from a celestial point is introduced into a receiver room via a 45-degree flat mirror and is divided into a plurality of beams by using a plurality of low pass filters having different bandwidths and mirrors, and the divided beams are transmitted to corresponding quasi-optical receivers having different bandwidths via a plurality of mirrors. Therefore, radio astronomic observations can be simultaneously performed in 22 GHz, 43 GHz, 86 GHz, and 129 GHz bands, and phase variations of electromagnetic waves in the bands can be compensated for.
REFERENCES:
patent: 4356494 (1982-10-01), Katagi et al.
patent: 4439012 (1984-03-01), Christy
patent: 6028300 (2000-02-01), Rhoads et al.
patent: 7379515 (2008-05-01), Johnson et al.
patent: 7656352 (2010-02-01), Alban et al.
patent: 2006/0121893 (2006-06-01), Tillotson et al.
patent: 2010/0127161 (2010-05-01), Han et al.
patent: 2010/0290025 (2010-11-01), Parker
Chung Moon Hee
Han Seog Tae
Je Do Heung
Lee Jung Won
Korea Astronomy and Space Science Institute
Lee John
Ostrolenk Faber LLP
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