Planar antenna for rfid reader and rfid pda incorporating the same

Abstract

A planar antenna comprising: a substrate (10) having opposed first (10A) and second (10B) flat faces; the first flat face comprising a first ground (12), a second ground (14), a feed track (16) there between and an antenna pattern (18) and the opposed second flat face comprising a third ground (20); the third ground being connected to first and second grounds for assuring the continuity of the ground plane with the feeding; and the antenna pattern forms a coil line disposed into the remaining surface of the first flat face and comprises two overlapped loops in such a way that the antenna pattern is substantially auto-complementary.

Dependencies are inferred from the claim text.