Communication device
A communication device includes a dielectric substrate, an antenna layer, a metamaterial layer, a first absorber element, a second absorber element, and a third absorber element. The dielectric substrate has a first surface and a second surface which are opposite to each other. The antenna layer is disposed on the first surface of the dielectric substrate. The metamaterial layer is adjacent to the antenna layer. The antenna layer and the metamaterial layer are both positioned between the first absorber element and the second absorber element. The third absorber element is disposed on the second surface of the dielectric substrate.
1. A communication device, comprising:
a dielectric substrate, having a first surface and a second surface opposite to each other;
an antenna layer, disposed on the first surface of the dielectric substrate;
a metamaterial layer, disposed adjacent to the antenna layer;
a first absorber element;
a second absorber element, wherein the antenna layer and the metamaterial layer are positioned between the first absorber element and the second absorber element; and
a third absorber element, disposed on the second surface of the dielectric substrate;
wherein an absorption frequency of electromagnetic waves of the first absorber element, the second absorber element, and the third absorber element is from 10 GHz to 100 GHz.
2. The communication device as claimed in claim 1 , wherein the antenna layer supports a mmWave (Millimeter Wave) operational frequency at 60 GHz.
3. The communication device as claimed in claim 1 , wherein each of the first absorber element and the second absorber element substantially has a rectangular shape, and wherein the third absorber element substantially has another rectangular shape.
4. The communication device as claimed in claim 1 , wherein a thickness of each of the first absorber element, the second absorber element, and the third absorber element is from 0.5 mm to 2 mm.
5. The communication device as claimed in claim 1 , wherein the antenna layer comprises at least one antenna element.
6. The communication device as claimed in claim 5 , wherein the antenna layer comprises 4 patch antenna elements.
7. The communication device as claimed in claim 5 , wherein the metamaterial layer comprises:
a carrier substrate, disposed adjacent to the antenna element; and
a plurality of conductive structure units, periodically arranged on the carrier substrate.
8. The communication device as claimed in claim 7 , wherein the metamaterial layer comprises 9 conductive structure units.
9. The communication device as claimed in claim 7 , wherein a vertical projection of at least one of the conductive structure units at least partially overlaps the antenna element.
10. The communication device as claimed in claim 7 , wherein each of the conductive structure units comprises a first C-shaped portion and a second C-shaped portion, and the second C-shaped portion is positioned inside the first C-shaped portion.
11. The communication device as claimed in claim 10 , wherein the first C-shaped portion has a first opening, the second C-shaped portion has a second opening, and the first opening and the second opening are oriented toward different directions.
12. The communication device as claimed in claim 7 , wherein each of the conductive structure units is a rectangular plate with a central notch.
13. The communication device as claimed in claim 7 , wherein a center-to-center distance between any two adjacent conductive structure units is from 0.4 mm to 0.6 mm.
14. The communication device as claimed in claim 7 , wherein a center-to-center distance between any two adjacent conductive structure units is substantially equal to 0.53 mm.
15. The communication device as claimed in claim 7 , wherein a distance between the conductive structure units and the antenna layer is from 0.05 mm to 0.15 mm.
16. The communication device as claimed in claim 7 , wherein a distance between the conductive structure units and the antenna layer is substantially equal to 0.102 mm.