5G infrastructure shielding — 70 dB average attenuation across 30 MHz – 16 GHz

Context

5G mid-band (sub-6 GHz) deployment and early Ka-band defence communications both require shielded-enclosure material that holds broadband attenuation through 16 GHz without the multi-material stacking that would otherwise be required. Commodity copper and aluminium mesh materials fall off in attenuation above the C-band; polymer-metallised alternatives degrade under field thermal cycling.

Specification

The application called for a single mesh specification that could cover the full 30 MHz – 16 GHz band with 65 dB+ attenuation under MIL-STD-285 shielding-effectiveness protocol, IEEE 299 shielded-enclosure measurement, and with a field-service life consistent with a 15-year base-station maintenance cycle.

Material choice

GTX EMI Shielding Mesh (GTX-EMI-M) was selected: NP1 ultra-pure nickel wire at 0.025 mm diameter, woven at 200–400 mesh count depending on the band-specific attenuation target, optionally PTFE-coated for environmental protection in exposed tower-top enclosures.

Deployment

Pilot deployment across a qualified tower-operator footprint spanning multiple climate zones. Installation followed the customer’s standard enclosure-fabrication workflow; GTX-Singapore fabricated pre-cut mesh panels to the customer’s enclosure drawing set, vacuum-packed for field installation.

Performance results

70 dB average attenuation across the full 30 MHz – 16 GHz band, with the attenuation profile holding its envelope across repeated thermal-cycle and humidity-cycle testing. Field measurements aligned with IIT Delhi laboratory baseline within instrument tolerance.

Commercial implication

Single-specification mesh replaces a multi-material shielding stack that would otherwise be specified to reach the upper-band attenuation target. Simplification of BoM and installation workflow; extended service-life projection; qualified for Ka-band defence communications cross-application.

Citations

• IIT Delhi · MIL-STD-285 attenuation dossier.
• IEEE 299-2006 · Standard Method for Measuring the Effectiveness of Electromagnetic Shielding Enclosures.
• US DoD · MIL-STD-285 · Method of Attenuation Measurement for Enclosures.
• GTX metrology · field-measurement correlation report.