Analysis and design of transparent conductive coatings and filters

Microwave shielding enhancement of high-transparency, double-layer, submillimeter-period metallic mesh

“…4-6 Inductive, square, metallic meshes, or metallic grids with submillimeter periods are widely used as high-pass filters to transmit optical bands (from visible to infrared) and reflect low-frequency microwave bands. 5,6 However, strong electromagnetic shielding cannot be achieved by a high-transparency, single-layer square mesh because of the inherent conflict between transmittance and shielding effectiveness. 5,6 Recently, both calculation and experiment have shown that double-layer metal films perforated with periodic subwavelength holes can exhibit extraordinary optical transmission 7-9 or a negative refractive index, [10][11][12][13] and double-layer wire grids or metal gratings can behave as broadband high-performance polarizers.…”

“…5,6 However, strong electromagnetic shielding cannot be achieved by a high-transparency, single-layer square mesh because of the inherent conflict between transmittance and shielding effectiveness. 5,6 Recently, both calculation and experiment have shown that double-layer metal films perforated with periodic subwavelength holes can exhibit extraordinary optical transmission 7-9 or a negative refractive index, [10][11][12][13] and double-layer wire grids or metal gratings can behave as broadband high-performance polarizers. 14,15 Considering the exceptional performance of these double-layer, periodic, perforated metal films, the use of double-layer metallic mesh appears to be critical in overcoming the inherent conflict between transmittance and shielding effectiveness that occurs for single-layer metallic mesh.…”

“…[1][2][3][4] Many methods have been proposed to achieve EMI shielding by reflection or absorption. [1][2][3][4][5] In many cases, visibly transparent EMI shielding has been of particular concern. 4-6 Inductive, square, metallic meshes, or metallic grids with submillimeter periods are widely used as high-pass filters to transmit optical bands (from visible to infrared) and reflect low-frequency microwave bands.…”

New metallic mesh designing with high electromagnetic shielding

“…The main advantages of metallic mesh frequency filtering technology for optical window electromagnetic shielding are: by selecting the appropriate mesh cycle and linewidth, and controlling the resonant frequency of the electromagnetic wave, a wide-band electromagnetic shielding with a wavelength greater than millimetre wave can be achieved, and the millimetre wave can be passed through but only shielded from the microwave band [1], and the same control may be achieved to the light transmission band. At the same time through the visible and infrared bands, can also only through the visible band and shielding infrared band [2].…”

Frequency Dependent Model of Sheet Resistance and Effect Analysis on Shielding Effectiveness of Transparent Conductive Mesh Coatings

“…But none of work has been done to give a frequency dependent model of sheet resistance for transparent conductive mesh coating, and most researchers in this field have not paid attention to its effect on EMI shielding. For example, Kohin et al [4] and Bright [5] ignored the effect of sheet resistance of mesh coatings in their analysis models. However, currently transparent conductive mesh coatings used on optical windows and domes are fabricated with fine linewidth, sub-millimeter and sub-micrometer thickness to ensure optical transmission, and especially voids or holes in the micro-size mesh pattern occasionally occur during the fabrication process.…”