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Diamox ITO – EMI / RFI Shielding
Introduction
Diamox ITO coatings offer an advanced solution for electromagnetic interference (EMI) and radio-frequency interference (RFI) shielding in demanding applications. By combining high transparency with strong electrical conductivity, Diamox ITO lets you protect sensitive electronics without compromising optical performance.
What Is Diamox ITO?
- ITO stands for Indium Tin Oxide, a transparent conductive oxide widely used where optical clarity and electrical conduction are both required.
- Diamox ITO Coatings are ultra-thin conductive layers deposited on glass or plastic substrates.
- Diamox ITO Coating provides an optically clear continuous conductive coating capable of blocking or attenuating electromagnetic and radio frequencies.
Key Benefits for Shielding
| High Shielding Effectiveness | Achieves strong attenuation of EMI/RFI across a broad frequency range when properly applied and terminated. |
| Optical Clarity Maintained | Excellent visible light transmission (>85-90%) even with conductive coating; keeps display, window, or sensor visibility high. |
| Versatile Substrates | Can be applied to glass, acrylic, polycarbonate, and other optical plastics. Surface finish and substrate choice can further optimise performance both mechanically and optically. |
| Customizable Sheet Resistance | Options for different sheet resistances to meet conductivity vs transparency trade-offs (lower resistance → better shielding, slightly lower transmission). Diamox ITO Coatings are available from 2.5 Ohms Sq up to 500 Ohms/sq. |
| Termination / Edge Connection Options | Can include conductive bus bars, copper/silver contacts, or conductive gaskets to enable proper grounding/connection to enclosure. |
Typical Performance
- Shielding Effectiveness: Depending on the application, Diamox ITO coatings can deliver performance of tens of dB across MHz to GHz ranges (e.g. ≥ 50-60 dB at lower MHz, lower but significant attenuation at high hundreds of MHz to GHz).
- Optical Transmission: In the visible spectrum (~550 nm), Index matched Diamox ITO Coatings with ~20 ohm/sq sheet resistance can transmit ~85-92 % depending on substrate and finish.
- Size & Coating Options: Available on large panels; coatings can be tailored in sheet resistance, substrate material, thickness, and finish to suit application needs.
Applications
Diamox ITO is suited for any scenario where you need both visibility/optical clarity and EMI/RFI protection. Examples include:
- Display windows, instrument panels, and touchscreens
- Medical equipment and imaging windows
- Avionics, aerospace and military systems
- Telecommunications, radio equipment
- Automotive sensor and HUD (Head-Up Display) windows
- Industrial and scientific measurement and optics systems
Design Considerations & Best Practices
- Substrate Material & Finish: Choice between glass and optical plastics (polycarbonate, acrylic) depends on weight, impact resistance, optical distortion, temperature, etc. Finish (hard coating, anti-glare, etc.) affects both transmission and durability.
- Sheet Resistance / Conductivity vs Transparency Trade-off: Lower sheet resistance improves shielding but usually reduces visible transmission or increases reflection; choose a value appropriate for your system’s sensitivity.
- Terminations / Grounding: Proper terminations (bus bars, conductive tapes, gaskets) are essential to achieve maximum shielding performance; ensure reliable contact to enclosure.
- Environmental / Durability Factors: Consider UV exposure, humidity, temperature cycling, mechanical abrasion; coatings and substrates should be chosen accordingly.
- Compliance & Testing: Measure shielding effectiveness to relevant standards (e.g. MIL-STD or other industry specific EMI/RFI test protocols) to verify performance in your specific configuration and frequency range.
Enquiry
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Diamond Coatings operate a state-of-the-art magnetron sputtering plant, equipped with clean rooms, from modern factory premises located in the heart of England, the Midlands. We provide a variety of products, namely Indium Tin Oxide (ITO), Anti-reflection (AR) coatings on plastic or glass, monolithic RFI shielding filters on plastic or glass, Touchscreens, capacitive or resistive, glass supply, mesh windows.
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