EP 0322498 A2 19890705 - Primary radiator for parabolic antenna.
Title (en)
Primary radiator for parabolic antenna.
Title (de)
Primärstrahler für Parabolantenne.
Title (fr)
Source primaire pour antenne parabolique.
Publication
Application
Priority
JP 30475387 A 19871202
Abstract (en)
An illumination aperture (6) for receiving radio waves in a radio wave introducing member (2) is blocked by a covering member (17), and thus dust is prevented from coming into the illumination aperture externally by the covering member. The covering member is so thick as will coincide with the trough in a transmission loss curve of radio wave of the synthetic resin used as a forming material for the covering member. Accordingly, a mechanical strength of the covering member is high. Then, an expected attentuation of the radio wave going toward the illumination aperture through the covering member is very little.
IPC 1-7
IPC 8 full level
H01Q 1/42 (2006.01); H01Q 19/08 (2006.01)
CPC (source: EP)
H01Q 1/42 (2013.01); H01Q 19/08 (2013.01)
Designated contracting state (EPC)
DE FR GB SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 88103388 A 19880304