Near field communication antenna, near field communication device and mobile system having the same

A near field communication (NFC) device, comprising:

• an NFC chip comprising a first transmission electrode and a second transmission electrode, and configured to generate a transmission signal and to output the transmission signal through the first transmission electrode and the second transmission electrode;
• an NFC antenna formed on a first surface of a substrate, the NFC antenna comprising a first antenna electrode, a second antenna electrode, and a loop coil directly coupled between the first antenna electrode and the second antenna electrode, and configured to emit an electromagnetic wave based on the transmission signal;
• and
• a matching circuit coupled to the first transmission electrode, the second transmission electrode, the first antenna electrode and the second antenna electrode, and configured to perform impedance matching between the NFC chip and the NFC antenna,
• wherein the loop coil comprises a plurality of turns, the first antenna electrode is located inside each of the plurality of turns of the loop coil, and the second antenna electrode is located outside each of the plurality of turns of the loop coil,
• wherein an imaginary line passing through the first antenna electrode and the second antenna electrode is parallel to one of edges of the substrate, and
• wherein each of the plurality of turns of the loop coil does not overlap each other.

A mobile system, comprising:

• a near field communication (NFC) device configured to communicate with an external device through NFC;
• a memory device configured to store output data;
• and
• an application processor configured to control operations of the NFC device and the memory device,
• wherein the NFC device comprises:
• an NFC chip comprising a first transmission electrode and a second transmission electrode, and configured to generate a transmission signal corresponding to the output data and to output the transmission signal through the first transmission electrode and the second transmission electrode;
• an NFC antenna formed on a first surface of a substrate, the NFC antenna comprising a first antenna electrode, a second antenna electrode, and a loop coil directly coupled between the first antenna electrode and the second antenna electrode, and configured to emit an electromagnetic wave based on the transmission signal;
• and
• a matching circuit coupled to the first transmission electrode, the second transmission electrode, the first antenna electrode, and the second antenna electrode, and configured to perform impedance matching between the NFC chip and the NFC antenna, and
• wherein the loop coil comprises a plurality of turns, the first antenna electrode is located inside each of the plurality of turns of the loop coil, and the second antenna electrode is located outside each of the plurality of turns of the loop coil,
• wherein an imaginary line passing through the first antenna electrode and the second antenna electrode is parallel to one of edges of the substrate, and
• wherein each of the plurality of turns of the loop coil does not overlap each other.