EP 1445829 B1 20060628 - Subreflector for Cassegrain microwave antenna
Title (en)
Subreflector for Cassegrain microwave antenna
Title (de)
Subreflektor für Cassegrain-Mikrowellenantenne
Title (fr)
Réflecteur secondaire pour antenne hyperfréquence de type cassegrain
Publication
Application
Priority
FR 0301236 A 20030204
Abstract (en)
[origin: EP1445829A1] The reflector (103) has a first circular ring (104) of cylindrical shape formed of a conductor material and directed toward a principle reflector. The ring has a diameter equal to an outer diameter of the reflector. The ring has one end fixed to outer side of reflector so as to project towards reflective side of the reflector, and is of specific height (H) to reduce the radiation spillover of the reflector. Preferably a second ring (105) in the form of a circular crown is fixed to the free edge of the first ring. The second ring has the same internal diameter as the first, and has a specific height (h) to further reduce reflector spillover. The values of the specific heights (H, h) are preferably of the order one quarter wavelength at the antenna operating frequency.
IPC 8 full level
H01Q 19/02 (2006.01); H01Q 13/00 (2006.01); H01Q 15/14 (2006.01); H01Q 19/19 (2006.01); H01Q 19/28 (2006.01)
CPC (source: EP US)
H01Q 19/026 (2013.01 - EP US); H01Q 19/19 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1445829 A1 20040811; EP 1445829 B1 20060628; AT E332020 T1 20060715; CN 1525599 A 20040901; CN 1525599 B 20101215; DE 602004001353 D1 20060810; DE 602004001353 T2 20070614; FR 2850796 A1 20040806; US 2004150576 A1 20040805; US 6809695 B2 20041026
DOCDB simple family (application)
EP 04290225 A 20040128; AT 04290225 T 20040128; CN 200410039511 A 20040203; DE 602004001353 T 20040128; FR 0301236 A 20030204; US 76868404 A 20040202