EP 0747995 A3 19971022 - Method of data transmission and antenna system especially for traffic communication systems and circuit device
Title (en)
Method of data transmission and antenna system especially for traffic communication systems and circuit device
Title (de)
Datenübertragungsverfahren und Antennensystem insbesondere für verkehrstechnische Kommunikationssysteme sowie Schaltungsanordnung
Title (fr)
Procédé de transmission de données et système d'antenne en particulier pour systèmes de communication de circulation et circuit
Publication
Application
Priority
CH 169795 A 19950609
Abstract (en)
[origin: EP0747995A2] The communication system uses a tuned antenna system (AS1a) which is selectively tuned to at least 2 frequencies, via switched impedances (Ct), with frequency modulation of the transmitted signal in dependence on the data. The resonance frequency of the tuned antenna system and the transmission signal frequency are sufficiently close to ensure transmission of the transmitted signal without attenuation. Pref. the transmitted signal is modulated before transmission via a frequency-shift-keying modulation method.
IPC 1-7
IPC 8 full level
H01Q 1/32 (2006.01); H01Q 21/30 (2006.01)
CPC (source: EP)
H01Q 1/3225 (2013.01); H01Q 21/30 (2013.01)
Citation (search report)
- [X] US 5034697 A 19910723 - JOHNSON LEOPOLD J [US]
- [X] EP 0535363 A2 19930407 - SIEMENS AG [DE]
- [X] US 4799066 A 19890117 - DEACON MALCOLM J [GB]
- [A] WO 9411754 A1 19940526 - SIEMENS AG ALBIS [CH], et al
- [E] WO 9632755 A1 19961017 - SIEMENS SCHWEIZ AG [CH], et al
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB IT LI NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 96810372 A 19960606