Antenna stack structure and display device including the same
An antenna stack structure according to an embodiment includes a lower dielectric layer, an antenna electrode layer formed on the lower dielectric layer, and an upper dielectric layer disposed on the antenna electrode layer. A dielectric constant of the upper dielectric layer is 1 or more and less than 7, and a thickness of the upper dielectric layer is in a range from 100 μm to 1,300 μm. A frequency and a band width are finely controlled using the upper dielectric layer while suppressing excessive gain reduction and frequency shift.
1. An antenna stack structure, comprising:
a lower dielectric layer;
an antenna electrode layer formed on the lower dielectric layer; and
an upper dielectric layer disposed on the antenna electrode layer,
wherein a dielectric constant of the upper dielectric layer is 1 or more and less than 7, and a thickness of the upper dielectric layer is in a range from 100 μm to 1,300 μm,
wherein the upper dielectric layer comprises a first upper dielectric layer and a second upper dielectric layer sequentially stacked from the antenna electrode layer, and
the first upper dielectric layer and the second upper dielectric layer have different dielectric constants from each other.
2. The antenna stack structure according to claim 1 , wherein the dielectric constant of the upper dielectric layer is from 1 to 5.5.
3. The antenna stack structure according to claim 1 , wherein the upper dielectric layer includes a glass, a resin layer or an adhesive layer.
4. The antenna stack structure according to claim 1 , wherein the plurality of dielectric layers are stacked so that dielectric constants are sequentially increased from the antenna electrode layer.
5. The antenna stack structure according to claim 1 , wherein a dielectric constant of the first upper dielectric layer is smaller than a dielectric constant of the second upper dielectric layer.
6. The antenna stack structure according to claim 1 , further comprising a ground layer disposed under the lower dielectric layer to face the antenna electrode layer.
7. The antenna stack structure according to claim 6 , further comprising a substrate layer disposed between the ground layer and the lower dielectric layer.
8. The antenna stack structure according to claim 7 , further comprising an adhesive layer disposed between the substrate layer and the ground layer.
9. The antenna stack structure according to claim 1 , wherein the antenna electrode layer comprises a radiator, a transmission line extending from the radiator and a signal pad connected to one end of the transmission line.
10. The antenna stack structure according to claim 9 , wherein the radiator includes a mesh structure, and the antenna electrode layer further comprises a dummy mesh pattern formed around the radiator.
11. The antenna stack structure according to claim 10 , wherein the signal pad has a solid pattern structure.
12. A display device, comprising:
a display panel; and
the antenna stack structure according to claim 1 stacked on the display panel.
13. The display device according to claim 12 , further comprising a touch sensor layer interposed between the display panel and the antenna stack structure.