| 摘要 |
The invention relates to a solution for accomplishing a wireless data exchange between an implantable medical device and an extracorporal unit by means of an antenna arrangement for communicating radio frequent signals. The proposed arrangement includes a patch plane (210) having a perimeter (a, b, c, d), a ground plane (220) of an electrically conducting material and a dielectric substrate (240) filling a volume between the patch plane (210) and the ground plane (220). The ground plane (220) has an area, which is larger than the patch plane (210) and is located in relation to the patch plane (210), such that a perpendicular projection of the patch plane (210) onto the ground plane (220) falls entirely within the ground plane (220). A grounding member (230) connects the patch plane (210) electrically to the ground plane (220) at a first segment (d) of the perimeter (a, b, c, d). The substrate (240) has a comparatively high relative permittivity and extends a well-defined distance (L3', L3") outside the volume between the patch plane (210) and the ground plane (220) with respect to at least one second segment (a, b, c) of the perimeter (a, b, c, d). Thereby, a non-conducting region is obtained outside the patch plane (210) and therefore only a relatively small amount of electromagnetic losses will occur in this region. <IMAGE>
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