Guowen Ding, Ping He, Labforinvention Corp., Fremont, CA
The widespread deployment of Low-E glass has unintentionally degraded indoor wireless connectivity due to the conductive thin-film physics. Unlike distributed antenna systems (DAS) or laser scribing that provide post-installation mitigations, this work presents a manufacturing-grade solution that integrates large-area photolithography with standard magnetron sputtering lines to create Frequency-Selective Surface (FSS) patterns on architectural glass, supported by multiple granted patents.
Manufacturer-coated prototypes demonstrated >30 dB (≈1000×) signal improvement at 5G frequencies compared to standard Low-E, with no degradation in thermal emittance or visible aesthetics. Crucially, the coatings demonstrate robust durability, via 10-month ambient exposure test.
This presentation highlights lithography pilot-line readiness for commercial-scale production. The process targets the dominant architectural panel size (up to 4 × 10 ft) and integrates seamlessly with existing jumbo Low-E production lines using mature flat-panel display (FPD) and PCB manufacturing equipment from established vendors. Economic analysis indicate that the incremental manufacturing cost of the pilot line is approximately $0.5/ft^², with an estimated 2–3 year payback running on 10–20% of an existing Low-E line production capacity. Scaling production volume is expected to drive unit costs down further. Together, these results establish a scalable, cost-effective pathway toward commercial-scale adoption of signal-penetrating Low-E glass for next-generation, connectivity-ready buildings.