EMI/RFI Shielding
Braided Shield + Conductive Gaskets for EMI Containment
EMI and radio-frequency shielding comprises tinned copper braided cable sheaths, conductive elastomer seam gaskets, and ferrite common-mode chokes designed to contain electromagnetic emissions from power switching. In lunar electrical architectures, where single-point grounding is mandated to prevent loop currents, this hardware suppresses switching ripple generated by primary power and DC-DC converters before it disrupts sensitive communications and sensor electronics. The passive 15-kilogram assembly provides 60 dB of shielding effectiveness at 1 GHz, drawing zero watts while maintaining a 50-year design lifetime and a 500,000-hour mean time between failures.
Braided shields, conductive gaskets, and shielded enclosures preventing EMI from power switching from interfering with comm/sensor electronics.
Purpose
Braided shields, conductive gaskets, and shielded enclosures preventing EMI from power switching from interfering with comm/sensor electronics.
Context
Child of L2-PDM-HARN within the Lunar Ark system
Principles
- ▸Coaxial braided shield around high-di/dt power cables
- ▸Conductive elastomer gaskets at enclosure seams
- ▸Shielded twisted pairs for sensitive signal cables
- ▸Common-mode chokes at converter outputs
- ▸Compliance per MIL-STD-461F EMI/EMC
Typical implementations
- ▸ISS EMI control heritage
- ▸MIL-STD-461F EMI compliance methodology
- ▸JWST EMI control program (low-noise environment)
Lunar considerations
- ▸Power-switching ripple from L3-ESS-SCAP-DCDN and L1-PWR converters managed by shielding
- ▸Single-point grounding philosophy prevents loop currents
- ▸Shielding integrity monitored via test ports
Specifications
Functional
| primary function | Braided shields, conductive gaskets, and shielded enclosures preventing EMI from power switching from interfering with comm/sensor electronics. |
| shielding effectiveness db at 1ghz | 60 |
Physical
| mass kg | 15 |
| materials | Tinned Cu braided shield, Conductive elastomer gaskets, Ferrite cores |
| vacuum compatibility | True |
Operational
| power consumption w | 0 |
| thermal range c | -40, 70 |
| lifetime years | 50 |
| mtbf hours | 500000 |
Interfaces
Provides
- EMI-clean environment for sensors
- EMI-clean environment for RF receivers
Requires
- Cable shielding application
Cite this entry
Lunar Ark Codex. "EMI/RFI Shielding" (L3-PDM-HARN-SHIELD). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-PDM-HARN-SHIELD
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.