Antenna structure and display device including the same
An antenna structure according to an embodiment of the present invention includes a film antenna including a dielectric layer, an upper electrode layer disposed on an upper surface of the dielectric layer and including a radiation pattern, a transmission line, and a ground pad, and a lower ground layer disposed on a lower surface of the dielectric layer, and a flexible circuit board including a core layer, a power supply wiring layer disposed on a lower surface of the core layer and electrically connected to the transmission line, and a ground plate disposed on an upper surface of the core layer and disposed in overlapping with the power supply wiring layer in a planar direction. Thereby, it is possible to reduce a radiation signal generated from the power supply wiring through the ground plate, suppress a noise of the antenna and increase radiation efficiency.
1. An antenna structure comprising:
a film antenna comprising:
a dielectric layer;
an upper electrode layer disposed on an upper surface of the dielectric layer, the upper electrode layer comprising a radiation pattern, a transmission line electrically connected to the radiation pattern, and a ground pad; and
a lower ground layer disposed on a lower surface of the dielectric layer; and
a flexible circuit board comprising:
a core layer;
a power supply wiring layer disposed on a lower surface of the core layer and electrically connected to the transmission line of the film antenna; and
a ground plate disposed on an upper surface of the core layer and disposed in overlapping with the power supply wiring layer in a planar direction.
2. The antenna structure according to claim 1 , wherein one end of the transmission line is integrally connected with the radiation pattern, and the other end of the transmission line is provided as a signal pad; and
the power supply wiring layer is electrically connected with the signal pad.
3. The antenna structure according to claim 2 , wherein a pair of the ground pads are disposed by interposing the signal pad therebetween.
4. The antenna structure according to claim 1 , wherein the power supply wiring layer of the flexible circuit board is disposed on the upper electrode layer of the film antenna.
5. The antenna structure according to claim 4 , wherein the flexible circuit board further comprises a ground contact which penetrates the core layer to be electrically connected with the ground pad of the film antenna.
6. The antenna structure according to claim 1 , wherein the ground pad and the transmission line of the film antenna are bent along a side face of the dielectric layer and extend onto a lower surface of the dielectric layer.
7. The antenna structure according to claim 6 , wherein the ground pad is integrally connected with the lower ground layer.
8. The antenna structure according to claim 6 , wherein the ground plate of the flexible circuit board is disposed under the film antenna so as to be electrically connected with the ground pad of the film antenna.
9. The antenna structure according to claim 6 , wherein the flexible circuit board further comprises a power supply contact which penetrates the core layer to electrically connect the power supply wiring layer and the transmission line of the film antenna with each other.
10. The antenna structure according to claim 1 , wherein the power supply wiring layer includes a plurality of power supply wirings, and the ground plate entirely covers the plurality of power supply wirings in the planar direction.
11. The antenna structure according to claim 1 , wherein the power supply wiring layer of the flexible circuit board is disposed on an upper surface of the core layer, and the ground plate is disposed on a lower surface of the core layer.
12. The antenna structure according to claim 1 , further comprising a circuit structure disposed on the flexible circuit board and configured to control power supply to the radiation pattern.
13. The antenna structure according to claim 12 , wherein the flexible circuit board further comprises a power supply via which penetrates the core layer to electrically connect the circuit structure and the power supply wiring layer with each other.
14. The antenna structure according to claim 12 , wherein the circuit structure is disposed on a lower portion of the core layer of the flexible circuit board, so as to be electrically connected with the power supply wiring layer.
15. The antenna structure according to claim 1 , wherein the radiation pattern comprises a mesh structure.
16. The antenna structure according to claim 15 , wherein the film antenna further comprises a dummy mesh pattern disposed on the upper surface of the dielectric layer with being spaced apart from the radiation pattern.
17. A display device comprising the antenna structure according to claim 1 .