EFA(03)-240X240T0800 vs 3M 1181 1" X 4"-100
| Part Number |
-240X240T0800.jpg)
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| Category | RFI and EMI - Shielding and Absorbing Materials | RFI and EMI - Shielding and Absorbing Materials |
| Manufacturer | KEMET | 3M (TC) |
| Description | FLEX SUPP. SHEET 240X240X0.3 | SHEET COP FL 25.4X101.6MM 100/PK |
| Package | - | - |
| Series | EFA | 1181 |
| Type | Absorbing Sheet | Shielding Sheet |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 130°C |
| Shape | Square | Rectangular |
| Length | 9.449" (240.00mm) | 4.000" (101.60mm) |
| Width | 9.449" (240.00mm) | 1.000" (25.40mm) |
| Thickness - Overall | 0.013" (0.33mm) | 0.004" (0.09mm) |
| Adhesive | Non-Conductive, Single Sided | Conductive, Single Sided |
| Material | Polymer Resin, Magnetic Powder | Copper Foil |
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1. What are common types of shielding materials?
Metals: Copper, aluminum, and steel for enclosures and cables.
Conductive coatings: Used on plastic housings.
Conductive fabrics or meshes: Flexible options for shielding irregular shapes.
Carbon-based materials: Lightweight options for EMI shielding in modern applications. -
2. What is the difference between near-field and far-field EMI, and how does it affect shielding?
Near-field EMI: Dominates at lower frequencies; requires materials with high magnetic permeability (e.g., Mu-metal).
Far-field EMI: Dominates at higher frequencies; relies on conductive materials to reflect or absorb interference. -
3. How are shielding effectiveness and absorption measured?
Shielding effectiveness: Measured in decibels (dB), indicating how much interference is blocked.
Absorption: Tested by the material's ability to dissipate electromagnetic energy. -
4. What emerging trends are shaping the RFI/EMI shielding industry?
Development of lightweight, flexible shielding materials for wearable and IoT devices.
Nanotechnology-based coatings for improved shielding efficiency.
Environmentally friendly, recyclable materials.
Enhanced shielding for higher frequencies used in 5G and mmWave applications.
