EP 0762355 B1 20020320 - Antenna device and electromagnetic detection device comprising such antenna device
Title (en)
Antenna device and electromagnetic detection device comprising such antenna device
Title (de)
Antenne und diese enthaltende elektromagnetische Detektionsvorrichtung
Title (fr)
Antenne et dispositif de détection électromagnétique incluant une telle antenne
Publication
Application
Priority
NL 1001125 A 19950904
Abstract (en)
[origin: EP0762355A1] Antenna device for use in an electromagnetic detection system, comprising two loop antenna coils for generating a detection field for detecting responders provided with a loop antenna coil in a detection zone, the loop antenna coils in operation forming part of an antenna circuit connected to an excitation circuit, which antenna circuit comprises a series resonance circuit and a parallel resonance circuit with the same resonance frequency as the series resonance circuit. The antenna circuit comprises a single damping resistance (R); one of the loop antenna coils (L) is constructed as a transformer (T) with two very strongly coupled windings (T1, T2) and a central branch, which loop antenna coil (L3) is connected in parallel with a first tuning capacitor (C3); and the damping resistance (R) is connected in series with the first tuning capacitor (C3) and is connected in parallel with a series connection of a second tuning capacitor (C4) and a second loop antenna coil (L4), while the end of the second loop antenna coil (L4) that is not connected with the second tuning capacitor (C4) is connected with the central branch of the loop antenna coil (L3) constructed as a transformer. <IMAGE>
IPC 1-7
IPC 8 full level
G08B 13/24 (2006.01)
CPC (source: EP)
G08B 13/2422 (2013.01); G08B 13/2477 (2013.01)
Designated contracting state (EPC)
DE ES GB NL
DOCDB simple family (publication)
EP 0762355 A1 19970312; EP 0762355 B1 20020320; DE 69619911 D1 20020425; DE 69619911 T2 20021121; ES 2176398 T3 20021201; NL 1001125 C2 19970305
DOCDB simple family (application)
EP 96202459 A 19960904; DE 69619911 T 19960904; ES 96202459 T 19960904; NL 1001125 A 19950904