Patent ID: 8681049

Claim:
A built-in FM transmitting antenna applied to a mobile device, comprising: a substrate unit having a circuit substrate, at least one grounding layer disposed on the circuit substrate, a plurality of conducting pads disposed on the circuit substrate, and a no-ground region disposed on the circuit substrate, wherein the at least one grounding layer does not cover the plurality of the conducting pads and the no-ground region; a first antenna unit disposed above the substrate unit and substantially parallel to the substrate unit; a conducting unit electrically connected between the substrate unit and the first antenna unit; and a second antenna unit directly disposed on the no-ground region, for decreasing an antenna operating frequency, wherein the second antenna unit has two ends respectively electrically connected to two of the conducting pads, and the two ends of the second antenna unit are respectively electrically connected to an FM chip module and the conducting unit through the two of the conducting pads.