US-12620719-B2 - Planar transparent antenna structure

Abstract

A planar transparent antenna structure is provided. The planar transparent antenna structure includes a dielectric substrate, a radiation conductive layer and a ground conductive layer. The dielectric substrate has a first surface and a second surface. The radiation conductive layer is disposed on the first surface of the dielectric substrate. The ground conductive layer is disposed on the second surface of the dielectric substrate. The radiation conductive layer and the ground conductive layer are composed of a plurality of wires connected in a mesh manner. Each of the wires is composed of a plurality of grid lines connected in a mesh manner.

Inventors

• Bing-Syun Li
• Li-Yang TSAI
• Kuang-Hui Shih
• Ruo-Lan Chang
• Kung-Ching Chu
• Wei-Chung Chen

Assignees

• INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE

Dates

Publication Date

20260505

Application Date

20240403

Priority Date

20240124

Claims (20)

1. 1 . A planar transparent antenna structure, comprising: a dielectric substrate, having a first surface and a second surface; a radiation conductive layer, disposed on the first surface of the dielectric substrate; and a ground conductive layer, disposed on the second surface of the dielectric substrate; wherein the radiation conductive layer and the ground conductive layer are composed of a plurality of wires interlaced and connected with each other, and each of the wires interlaced and connected with each other is composed of a plurality of grid lines interlaced and connected with each other to form a two-levels metal mesh.
2. 2 . The planar transparent antenna structure according to claim 1 , wherein a spacing among the wires is less than 1/20 of a dielectric wavelength of the dielectric substrate.
3. 3 . The planar transparent antenna structure according to claim 1 , wherein a width of each of the wires is greater than a sum of a width of each of the grid lines and a spacing among the grid lines.
4. 4 . The planar transparent antenna structure according to claim 1 , wherein a width of each of the grid lines is 5 to 100 um.
5. 5 . The planar transparent antenna structure according to claim 1 , wherein a spacing among of the grid lines is 100 to 300 um.
6. 6 . The planar transparent antenna structure according to claim 1 , wherein the wires are substantially parallel or perpendicular to each other.
7. 7 . The planar transparent antenna structure according to claim 1 , wherein the grid lines are substantially parallel or perpendicular to each other.
8. 8 . The planar transparent antenna structure according to claim 1 , wherein each of the wires includes a plurality of through holes.
9. 9 . The planar transparent antenna structure according to claim 8 , wherein sizes of the through holes are not identical.
10. 10 . The planar transparent antenna structure according to claim 1 , wherein the wires are interlaced and connected to form a plurality of triangles.
11. 11 . The planar transparent antenna structure according to claim 1 , wherein an edge of the radiation conductive layer is a circular structure.
12. 12 . The planar transparent antenna structure according to claim 1 , wherein spacings among the wires are not identical.
13. 13 . A planar transparent antenna structure, comprising: a dielectric substrate, having a first surface and a second surface; a radiation conductive layer, disposed on the first surface of the dielectric substrate; and a ground conductive layer, disposed on the second surface of the dielectric substrate; wherein the radiation conductive layer and the ground conductive layer are composed of a plurality of wires interlaced and connected with each other, each of the wires interlaced and connected with each other has a plurality of holes, and the wires having the holes are interlaced and connected with each other.
14. 14 . The planar transparent antenna structure according to claim 13 , wherein a spacing among the wires is less than 1/20 of a dielectric wavelength of the dielectric substrate.
15. 15 . The planar transparent antenna structure according to claim 13 , wherein a width of each of the holes is 100 to 300 um.
16. 16 . The planar transparent antenna structure according to claim 13 , wherein a spacing among the holes is 5 to 100 um.
17. 17 . The planar transparent antenna structure according to claim 13 , wherein a width of each of the wires is larger than a width of each of the holes.
18. 18 . The planar transparent antenna structure according to claim 13 , wherein each of the holes is circle.
19. 19 . A planar transparent antenna structure, comprising: a dielectric substrate, having a first surface and a second surface; a radiation conductive layer, disposed on the first surface of the dielectric substrate; and a ground conductive layer, disposed on the second surface of the dielectric substrate; wherein the radiation conductive layer and the ground conductive layer have a plurality of openings arranged in an array and a plurality of grid lines, and the grid lines are distributed between the openings arranged in the array.
20. 20 . The planar transparent antenna structure according to claim 19 , wherein a width of each of the openings is less than 1/20 of a dielectric wavelength of the dielectric substrate.

Description

This application claims the benefit of U.S. Provisional application Ser. No. 63/457,428, filed Apr. 6, 2023, and Taiwan application Serial No. 113102792, filed Jan. 24, 2024, the disclosure of which are incorporated by reference herein in its entirety. TECHNICAL FIELD The disclosure relates to a planar transparent antenna structure. BACKGROUND Traditional antennas do not have light penetration, so when used in related fields such as glass windows, vehicle sunroofs and vehicle side windows, they will encounter problems of blocking the field of view and being in conflict with the environment. Traditionally, metal oxide semiconductor is used to make antennas to achieve transparency. However, metal oxides have poor electrical conductivity, which is 100 times worse than metal. This in turn causes the antenna radiation efficiency to be significantly attenuated, seriously affecting the electrical properties of the antenna. The industry needs to develop an antenna with a light transmittance greater than 80% and good radiation function to expand the antenna to some applications such as vehicles, buildings, displays, etc. SUMMARY The disclosure is directed to a planar transparent antenna structure. Through the design of the two-levels metal mesh, the planar transparent antenna structure could not only show a certain degree of light transmittance, but also have good radiation efficiency. According to one embodiment, a planar transparent antenna structure is provided. The planar transparent antenna structure includes a dielectric substrate, a radiation conductive layer and a ground conductive layer. The dielectric substrate has a first surface and a second surface. The radiation conductive layer is disposed on the first surface of the dielectric substrate. The ground conductive layer is disposed on the second surface of the dielectric substrate. The radiation conductive layer and the ground conductive layer are composed of a plurality of wires interlaced and connected with each other, and each of the wires is composed of a plurality of grid lines interlaced and connected with each other. According to another embodiment, a planar transparent antenna structure is provided. The planar transparent antenna structure includes a dielectric substrate, a radiation conductive layer and a ground conductive layer. The dielectric substrate has a first surface and a second surface. The radiation conductive layer is disposed on the first surface of the dielectric substrate. The ground conductive layer is disposed on the second surface of the dielectric substrate. The radiation conductive layer and the ground conductive layer are composed of a plurality of wires interlaced and connected with each other, and each of the wires has a plurality of holes. According to an alternative embodiment, a planar transparent antenna structure is provided. The planar transparent antenna structure includes a dielectric substrate, a radiation conductive layer and a ground conductive layer. The dielectric substrate has a first surface and a second surface. The radiation conductive layer is disposed on the first surface of the dielectric substrate. The ground conductive layer is disposed on the second surface of the dielectric substrate. The radiation conductive layer and the ground conductive layer have a plurality of openings and a plurality of grid lines, and the grid lines are distributed between the openings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a three-dimensional view of the planar transparent antenna structure according to an embodiment. FIG. 2 illustrates a top view of the planar transparent antenna structure of the FIG. 1. FIG. 3 illustrates a side view of the planar transparent antenna structure of the FIG. 1. FIG. 4 illustrates the radiation conductive layer of the planar transparent antenna structure according to one embodiment. FIG. 5 illustrates the ground conductive layer of the planar transparent antenna structure according to one embodiment. FIG. 6 shows a radiation field diagram of the planar transparent antenna structure with different spacings. FIG. 7 illustrates examples of radiation conductive layers under different designs. FIG. 8 illustrates a radiation conductive layer of a planar transparent antenna structure according to another embodiment. FIG. 9 illustrates a ground conductive layer of the planar transparent antenna structure according to another embodiment. FIG. 10 illustrates a radiation conductive layer of a planar transparent antenna structure according to another embodiment. FIG. 11 illustrates a ground conductive layer of the planar transparent antenna structure according to another embodiment. FIG. 12 illustrates a radiation conductive layer of a planar transparent antenna structure according to another embodiment. FIG. 13 illustrates a ground conductive layer of the planar transparent antenna structure according to another embodiment. FIG. 14 illustrates a radiation conductive layer of a planar transp