Antenna structure and image display device including the same
An antenna structure according to an embodiment of the present disclosure includes a dielectric layer, and a plurality of antenna units arranged on a top surface of the dielectric layer. Each of the plurality of antenna units includes a radiator, a transmission line including a first transmission line and a second transmission line that extend in different directions to be connected to the radiator, an upper parasitic element adjacent to an upper portion of the radiator, and a lower parasitic element adjacent to a lower portion of the radiator and the transmission line. Feeding signals of different phases are applied to the first transmission line and the second transmission line.
1. An antenna structure, comprising:
a dielectric layer; and
a plurality of antenna units arranged on a top surface of the dielectric layer, each of the plurality of antenna units comprising:
a radiator;
a transmission line comprising a first transmission line and a second transmission line that extend in different directions being connected to the radiator;
an upper parasitic element adjacent to an upper portion of the radiator; and
a lower parasitic element adjacent to a lower portion of the radiator and the transmission line,
wherein the first transmission line having a first feeding portion, and the second transmission line having a second feeding portion, where the first feeding portion and the second feeding portion serve as antenna ports to which feeding signals of different phases are applied, and the feeding signals of different phases are applied to the first transmission line and the second transmission line.
2. The antenna structure of claim 1 , wherein a phase difference between the feeding signals applied to the first transmission line and the second transmission line is from 120° to 180°.
3. The antenna structure of claim 1 , wherein at least a portion of an antenna unit of the plurality of antenna units is shared with another neighboring antenna unit.
4. The antenna structure of claim 3 , wherein the antenna unit and the neighboring antenna unit share a portion of the lower parasitic element with each other.
5. The antenna structure of claim 1 , wherein the plurality of antenna units are arranged being spaced apart from each other.
6. The antenna structure of claim 1 , wherein the radiator comprises convex portions and concave portions; and
the first transmission line and the second transmission line are connected to different concave portions among the concave portions.
7. The antenna structure of claim 1 , wherein the first transmission line further comprises
a first bent portion extending from the first feeding portion being connected to the radiator, and
the second transmission line further comprises
a second bent portion extending from the second feeding portion being connected to the radiator.
8. The antenna structure of claim 1 , wherein the upper parasitic element comprises a first upper parasitic element and a second upper parasitic element separated from each other.
9. The antenna structure of claim 8 , the radiator comprises convex portions and concave portions, and
the first upper parasitic element and the second upper parasitic element are disposed being adjacent to different concave portions of the concave portions.
10. The antenna structure of claim 9 , wherein the first upper parasitic element and the second upper parasitic element face each other with a convex portion located at an upper portion of the radiator among the convex portions interposed therebetween.
11. The antenna structure of claim 1 , wherein the lower parasitic element comprises:
a first side parasitic element adjacent to the first transmission line; and
a second side parasitic element adjacent to the second transmission line.
12. The antenna structure of claim 11 , wherein the lower parasitic element further comprises a central parasitic element disposed between the first transmission line and the second transmission line; and
the first side parasitic element is separated from the central parasitic element with the first transmission line interposed therebetween, and the second side parasitic element is separated from the central parasitic element with the second transmission line interposed therebetween.
13. The antenna structure of claim 12 , wherein the first side parasitic element comprises:
a first parasitic body facing the central parasitic element with the first transmission line interposed therebetween;
a first parasitic extension protruding from the first parasitic body; and
a first parasitic branched portion extending from the first parasitic extension toward the radiator,
wherein the second side parasitic element comprises:
a second parasitic body facing the central parasitic element with the second transmission line interposed therebetween;
a second parasitic extension protruding from the second parasitic body; and
a second parasitic branched portion extending from the second parasitic extension toward the radiator.
14. The antenna structure of claim 13 , wherein the radiator has a mesh structure; and
the central parasitic element, the first parasitic body, and the second parasitic body have a solid structure.
15. The antenna structure of claim 14 , wherein a portion of the first transmission line between the central parasitic element and the first parasitic body has a solid structure, and a remaining portion of the first transmission line has a mesh structure; and
a portion of the second transmission line between the central parasitic element and the second parasitic body has a solid structure, and a remaining portion of the second transmission line has a mesh structure.
16. The antenna structure of claim 13 , wherein the radiator has a mesh structure; and
each of the central parasitic element, the first parasitic body and the second parasitic body comprises a mesh portion and a solid portion.
17. The antenna structure of claim 1 , wherein the radiator has a four-leaf clover shape or a cross shape.
18. An image display device comprising the antenna structure of claim 1 .