Conductive mesh structure and antenna element comprising same
A conductive mesh structure according to an embodiment includes a dielectric layer, and a conductive mesh layer including first conductive lines and second conductive lines arranged on the dielectric layer and intersecting each other. The conductive mesh layer satisfies a predetermined range of transmittance and numerical values related to the interior angle of a mesh unit cell. An antenna element in which moiré is suppressed can be manufactured from the conductive mesh structure.
1 . An antenna element comprising:
a conductive mesh structure comprising:
a dielectric layer; and
a conductive mesh layer disposed on the dielectric layer, the conductive mesh layer comprising first conductive lines and second conductive lines crossing each other,
wherein the conductive mesh layer comprises unit cells defined by the neighboring first conductive lines and the neighboring second conductive lines which cross each other, and
the conductive mesh structure that satisfies Equation 1 and Equation 2 below:
20%≤(a transmittance of the conductive mesh structure)×tan(θ/2)≤45% [Equation 1]
20%≤(a transmittance of the dielectric layer)×(a ratio of an open area of the conductive mesh layer)×tan(θ/2)≤45% [Equation 2]
wherein θ in Equation 1 is an interior angle of the unit cell,
in Equation 1 and Equation 2, θ is an intersecting angle of the first conductive lines and the second conductive lines,
wherein the ratio of an open area of the conductive mesh layer is defined as a ratio of an area of the unit cells relative to a total area of the first conductive lines, the second conductive lines and the unit cells,
wherein the antenna element comprises:
a radiator formed from the conductive mesh layer;
a transmission line formed from the conductive mesh layer and connected to the radiator; and
a signal pad directly connected to an end portion of the transmission line and formed as a solid pattern,
wherein the radiator, the transmission line and the signal pad are directly formed on a top surface of the dielectric layer.
2 . The antenna element according to claim 1 , wherein the ratio of the open area of the conductive mesh layer is defined by Equation 3 below:
(the ratio of the open area of the conductive mesh layer)=/( X×Y )/[{ X +(2 W ×COS(θ/2))}×{ Y +(2 W ×SIN(θ/2))}] [Equation 3]
in Equation 3, X is a length of a diagonal line of each of the unit cells having a rhombus shape in a horizontal direction, Y is a length of a diagonal line of each of the unit cells having the rhombus shape in a vertical direction, and W is a line width of the first conductive lines and the second conductive lines.
3 . The antenna element according to claim 1 , further comprising a dummy mesh pattern formed from the conductive mesh layer and physically and electrically separated from the radiator.
4 . The antenna element according to claim 1 , wherein the antenna element has a gain of 0 dBi or more at a frequency of 20 GHz or more.