The invention concerns an armoured magnetic field antenna comprising at least one spire of metal element and a metal tubular armour arranged around said element. The spire (3a) is made of a printed circuit of insulating material (4a). The armour is constituted by two open rings (5a, 6a), made of printed circuit and arranged respectively on a lower card (9a) and an upper card (10a) of insulating material, said cards being assembled by clasping the spire and of a plurality of metal vias (7a, 8a) connecting the edges of the two rings through said cards, said vias being distributed on either side of the spire.

Title
Armoured magnetic field antenna in printed circuit
Application Number
97180924
Publication Number
1241306
Application Date
October 27, 1997
Publication Date
January 12, 2000
Inventor
P A Collet
Y Le Nevez
Angelo
P Lamata D& 39
Agent
cui yaobeng
Assignee
Gemplus S C A
IPC
H01Q 07/04
H01Q 01/38
H01Q 01/22