EP 0439677 A3 19910911 - VEHICLE ANTENNA COMPRISING A CONDUCTRICE WALL WITH A CIRCULAR SLOT
Title (en)
VEHICLE ANTENNA COMPRISING A CONDUCTRICE WALL WITH A CIRCULAR SLOT
Publication
Application
Priority
DE 4002899 A 19900201
Abstract (en)
[origin: EP0439677A2] 2.1 A known circular slot antenna is intended to be improved such that its horizontal and vertical polar diagram has a comparatively high antenna gain and such that the vertical polar diagram has as far as possible no antenna gain at all underneath the antenna. 2.2 On the underside (12) of the conductive wall (10), the vehicle antenna according to the invention has a cavity, which coaxially surrounds the circular slot (11), in the form of a pot (13). 2.3 A preferred field of application for the vehicle antenna is a motor vehicle antenna for the 900 MHz band. 3. The drawing shows a perspective sectional view of the vehicle antenna. <IMAGE>
IPC 1-7
IPC 8 full level
H01Q 1/22 (2006.01); H01Q 1/32 (2006.01); H01Q 9/04 (2006.01); H01Q 13/18 (2006.01)
CPC (source: EP)
H01Q 1/3275 (2013.01); H01Q 9/0464 (2013.01); H01Q 13/18 (2013.01)
Citation (search report)
- [X] US 2724772 A 19551122 - EDWARD BRIDGES DONALD, et al
- [A] EP 0174068 A1 19860312 - SECR DEFENCE BRIT [GB]
- [A] EP 0278070 A1 19880817 - BALL CORP [US]
- [X] P.HONOLD 'Sekund{r-Radar' 1971 , SIEMENS AG , BERLIN UND M}NCHEN
Designated contracting state (EPC)
AT BE DE ES FR GB IT SE
DOCDB simple family (publication)
EP 0439677 A2 19910807; EP 0439677 A3 19910911; DE 4002899 A1 19910808; JP H057105 A 19930114
DOCDB simple family (application)
EP 90117742 A 19900914; DE 4002899 A 19900201; JP 844691 A 19910128