All electronics emit some level of radio frequency known as electromagnetic radiation. A number of products have been developed over the years to combat these undesired signals. Currently, there are two types of EMI shielding: transparent conductive coating and EMI mesh. Transparent conductive coating is available on: 1) Film or 2) Glass. EMI mesh includes: 1) Wire Mesh, 2) Micromesh, and 3) Lasermesh. Each option offers varying levels of light transmission, attenuation, and sheet resistance.
Traditionally, coated glass offered higher light transmission than EMI mesh. Due to recent advances in the field current EMI shielding products do offer higher light transmission than traditional products. EMI mesh offers a wider effective attenuation range than coated glass. Also, sheet resistance is significantly lower in EMI mesh filters compared to coated conductive coatings. Fundamental factors for mesh size and colour include: openings per inch and blackening of the mesh. Other factors to contemplate when considering EMI shielding include: 1) Grounding options such as bus-bars and conductive tape, 2) Mesh angle, 3) Enhancement options.
The purpose of this document is to define the different EMI shielding options available in the market. First, the document provides a brief background on EMI shielding. Second, the document gives a technical overview of EMI filters and their specifications. Third, the document lists the different A D Metro design options and the new possibilities and parameters resulting from the innovative incorporation of EMI filters into A D Metro’s ULTRA touch screen.