Film antenna and display device including the same
A film antenna according to an embodiment of the present invention includes a dielectric layer, and a plurality of radiation patterns on a top surface of the dielectric layer. The plurality of radiation patterns has different resonance frequencies on the same plane. The radiation patterns of different frequency bands are arranged in the film antenna to provide a broadband communication.
1. A film antenna, comprising:
a dielectric layer;
a plurality of radiation elements each having a pattern, the plurality of radiation elements on a top surface of the dielectric layer, the plurality of radiation elements having different resonance frequencies on the same plane,
a transmission line extending from each of the plurality of the radiation elements; and
pads electrically connected to the plurality of the radiation elements, respectively, via the transmission line, the pads each being connected to an end of the transmission line,
a dummy element formed around the plurality of the radiation elements, the dummy element being separated and insulated from the plurality of the radiation elements,
wherein the plurality of the radiation elements, the transmission line and the pads are disposed at the same level, and the plurality of the radiation elements, the transmission line and the pads are disposed only on a top surface of the dielectric layer; and
the plurality of radiation elements and the dummy element include a mesh-pattern structure.
2. The film antenna of claim 1 , wherein the plurality of radiation elements comprise a first radiation element, a second radiation element and a third radiation element which are sequentially arranged along one direction parallel to the top surface of the dielectric layer; and
the first radiation element, the second radiation element and the third radiation element have different resonance frequencies from each other.
3. The film antenna of claim 2 , wherein a resonance frequency of the first radiation element, a resonance frequency of the second radiation element and a resonance frequency of the third radiation element sequentially increase.
4. The film antenna of claim 3 , wherein a length of the first radiation element, a length of the second radiation element and a length of the third radiation element sequentially decrease.
5. The film antenna of claim 4 , wherein a difference between the length of the first radiation element and the length of the second radiation element, and a difference between the length of the second radiation element and the length of the third radiation element are each from 0.01 mm to 5 cm.
6. The film antenna of claim 2 , wherein the first radiation element comprises a plurality of first radiation elements to form a first radiation group, the second radiation element comprises a plurality of second radiation elements to form a second radiation group, and the third radiation element comprises a plurality of third radiation elements to form a third radiation group.
7. The film antenna of claim 1 , wherein a distance between centers of neighboring radiation elements having different resonance frequencies of the plurality of radiation elements is greater than or equal to half a minimum wavelength corresponding to a resonance frequency of the film antenna.
8. The film antenna of claim 1 , wherein an entire resonance frequency of the film antenna is in a range from 3 GHz to 70 GHz.
9. The film antenna of claim 1 , further comprising a ground layer on a bottom surface of the dielectric layer.
10. A display device comprising the film antenna of claim 1 .