Patent ID: 8115694

Claim:
A coupling device, comprising: a substrate, comprising a first surface and a second surface; a ground element, disposed on the second surface, wherein the ground element comprises a first portion, a second portion, an annular groove and a feed slot, the annular groove is located between the first portion and the second portion, enclosing the first portion, and a first end of the feed slot is connected to the annular groove; a first feed conductor, disposed on the first surface corresponding to the annular groove, wherein the first feed conductor couples the ground element to feed a current signal; and a second feed conductor, disposed on the first surface corresponding to the feed slot, wherein second feed conductor couples the feed slot to feed a magnetic current, wherein the substrate further comprises a first side and a second side, the first side is perpendicular to the second side, the first feed conductor extends in a first direction from the first side, the second feed conductor extends in a second direction from the second side, and the first direction is perpendicular to the second direction, wherein the first feed conductor comprises a first conductive portion and a first feed portion, the first feed portion corresponds to the annular groove, and the first conductive portion extends in the first direction from the first side connected to the first feed portion.