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Microstructure FSS patterning to improve 5G microwave signals through low-e plastic windows

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dc.contributor.authorYunos, L.
dc.contributor.authorJane, M.L.
dc.contributor.authorMurphy, P.
dc.contributor.authorZuber, K.
dc.date.issued2023
dc.description.abstractLow emissivity (low-e) windows are widely used in the architectural sector to block the infrared (IR) radiation from the Sun. The windows contain a multilayer nanoscale coating of metallic and dielectric layers. The metallic layer, which is responsible for the IR reflection, also attenuates the radio and microwave frequencies used for modern-day technologies such as Fifth Generation (5G) communications. As there is an ever-increasing demand for a reliable interior-to-exterior signal coverage, low-e windows should be transparent to such signals. A class of surface modification - Frequency Selective Surface (FSS) is the technique of choice to be applied on the thin metallic coating to transmit the wireless signal. In this work, a thin silver (Ag) film – 10 nm thick was deposited by electron beam evaporation on polycarbonate substrates as an example low-e coating. Despite excellent IR blocking (64 %) and visible light transmittance (60 %), it also presented a high attenuation of 20 dB at 5G signal bands (72 – 82 GHz). FSS patterns of various geometries and sizes were applied via laser ablation and evaluated to provide the lowest attenuation. We demonstrated that the application of the hexagonal pattern provided largest improvement reducing the 5G attenuation value from 20 dB to 1 dB, without compromising the visible transmittance and having only a minor effect on IR reflection.
dc.identifier.citationResults in Surfaces and Interfaces, 2023; 11(100113):1-19
dc.identifier.doi10.1016/j.rsurfi.2023.100113
dc.identifier.issn2666-8459
dc.identifier.issn2666-8459
dc.identifier.orcidZuber, K. [0000-0003-0579-1983]
dc.identifier.urihttps://hdl.handle.net/11541.2/33937
dc.language.isoen
dc.publisherElsevier
dc.relation.fundingMalaysia Automotive Robotics and IoT Institute (MARii)
dc.rightsCopyright 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CCBY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
dc.source.urihttps://doi.org/10.1016/j.rsurfi.2023.100113
dc.subjectlow-e coating
dc.subjectthin film coatings
dc.subjectfrequency selective surface
dc.subjectsurface modification
dc.subject5g signals improvement
dc.titleMicrostructure FSS patterning to improve 5G microwave signals through low-e plastic windows
dc.typeJournal article
pubs.publication-statusPublished
ror.fileinfo12273631980001831 13273631970001831 1-s2.0-S2666845923000181-main
ror.mmsid9916733930701831

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