SIGNAL FRIENDLY METALLIC SURFACES
The present disclosure relates to coated articles and their preparation methods. The coated article comprises a metallic layer, wherein the metallic layer bears a frequency selective surface configured to reduce attenuation of telecommunication frequency signal transmission.
1 . A coated article comprising a metallic layer, wherein the metallic layer bears a frequency selective surface configured to reduce attenuation of telecommunication frequency signal transmission.
2 . The coated article according to claim 1 , wherein the metallic layer is a metallic IR reflective layer within a low-E coating comprised by the coated article.
3 . The coated article according to claim 1 , wherein the frequency selective surface comprises a periodic pattern and/or an aperiodic pattern.
4 . The coated article according to claim 3 , wherein the periodic pattern is selected from the group consisting of a periodic hexagonal lattice, a periodic square lattice, a periodic triangular lattice, a periodic circular lattice and a periodic Kagome lattice, and the aperiodic pattern is selected from a penrose tiling.
5 . The coated article according to claim 1 , wherein the frequency selective surface comprises a periodic pattern that has a unit cell dimension of less than about 2 mm and an aperture line width of about 5 μm to about 60 μm, for example about 30 μm to about 60 μm.
6 . The coated article according to claim 5 , wherein the frequency selective surface comprises a periodic pattern that has a unit cell dimension of about 0.5 mm and an aperture line width of about 50 μm.
7 . The coated article according to claim 6 , wherein the frequency selective surface comprises a periodic hexagonal lattice that has a unit cell dimension of about 0.5 mm and an aperture line width of about 50 μm.
8 . The coated article according to claim 1 , wherein the telecommunication frequency is for the fifth-generation (5G) communication.
9 . The coated article according to claim 1 , wherein the attenuation of telecommunication frequency signal transmission is reduced from about 30 dB to about 1 dB when compared with a coated article wherein the metallic layer bears no frequency selective surface.
10 . The coated article according to claim 1 , wherein the metallic layer comprises Ag, Al, Cu, Zn, Nb, TiN, Ag/Au alloys, Ag/Cu alloys, Ag/Al alloys, NbN x , NbCr, NbCrN x , NbZrO x , and/or Au.
11 . The coated article according to claim 1 , wherein the metallic layer has a thickness of about 5 nm to about 25 nm, preferably about 10 nm to about 20 nm.
12 . The coated article according to claim 1 , wherein the coated article comprises a low-E coating supported by a substrate, and the low-E coating comprises, in order outward from the substrate, a dielectric layer, a protective layer, a metallic IR reflective layer, a protective layer, and a dielectric layer.
13 . (canceled)
14 . A method of reducing attenuation of telecommunication frequency signal transmission for the coated article according to claim 1 , wherein the method comprises creating a frequency selective surface on the metallic layer.
15 . (canceled)
16 . The method according to claim 14 , wherein one or more stack is subjected to laser etching to create a frequency selective surface on the metallic layer and the one or more stack is selected from the following group: a stack of a substrate/a metallic layer, a stack of a substrate/a protective layer/a metallic layer, a stack of a substrate/a dielectric layer/a protective layer/a metallic layer, a stack of a substrate/a dielectric layer/a protective layer/a metallic layer/a protective layer, a substrate/a metallic layer/a substrate, a stack of a substrate/a protective layer/a metallic layer/a substrate, a stack of a substrate/a dielectric layer/a protective layer/a metallic layer/a substrate, and a stack of a substrate/a dielectric layer/a protective layer/a metallic layer/a protective layer/a substrate.
17 . The method according to claim 16 , wherein, for the laser etching, a laser beam enters from either side of the stack to create a frequency selective surface on the metallic layer.
18 . The method according to claim 14 , wherein a multiple pane window comprising a metallic layer is subjected to laser etching to create a frequency selective surface on the metallic layer.
19 . The method according to claim 14 , wherein a percentage of no more than about 25% area of the metallic layer is removed to create a frequency selective surface on the metallic layer.
20 . The method according to claim 14 , wherein a percentage of no more than about 20% area of the metallic layer is removed to create a frequency selective surface on the metallic layer.
21 . The method according to claim 14 , wherein a percentage of no more than about 10% area of the metallic layer is removed to create a frequency selective surface on the metallic layer.
22 . (canceled)