AGY Launches Low-Loss Glass Fibre Yarn
AGY has introduced L-Glass, a low-loss glass fibre yarn for printed wiring board (PWB) applications. The low dielectric constant (Dk) and low dissipation factor (Df) properties of L-Glass fibre are suitable for designs requiring increased signal speeds and better signal integrity than traditional E-Glass/epoxy substrate materials.
Scott Northrup, director of new business development at AGY, said: 'Substrate materials that provide low dielectric constant and low dissipation factor properties have become an essential element of high-speed digital systems such as mobile communication base stations, high-end routers and servers, and high-speed storage networks.
'As these systems move to higher processing speeds, substrates with low-loss properties are needed to ensure the speed and integrity of the signals,' he added. Low-loss laminates for high-speed applications have traditionally been produced in one of two ways. In one method, a higher performing epoxy resin system is used in conjunction with E-Glass. This approach limits the achievable Dk and Df properties.
The second method combines very low Dk/Df resins, such as PTFE, with ceramic filler and a much lower E-Glass content. While these systems can achieve much lower Df/Dk properties, they suffer from high material and processing costs. The low glass loading also reduces the dimensional stability of the laminate.
The use of L-Glass fibre overcomes these limitations by allowing epoxy resin systems to achieve much lower Dk/Df properties, and the PTFE-based systems to use a higher glass loading. At 10GHz L-Glass fibre has a dielectric constant of 4.86 and a dissipation factor of 0.0050, whereas E-Glass has a dielectric constant of 6.81 and a dissipation factor of 0.0060 at 10GHz. The coefficient of thermal expansion (CTE) of L-Glass fibre is 3.9ppm/C compared to 5.4ppm/C for E-Glass.
This makes L-Glass fibre a suitable material for use in IC packaging, where CTE mismatches with silicon are magnified due to the thermal environment and can cause defects. AGY's L-Glass fibres will be available in a variety of yarn counts, that will allow production of low-loss fabrics analogous to styles 106, 1080, 2113/2313 and 2116. Additional yarn counts can be produced as needed to meet market demands.
AGY has introduced L-Glass, a low-loss glass fibre yarn for printed wiring board (PWB) applications. The low dielectric constant (Dk) and low dissipation factor (Df) properties of L-Glass fibre are suitable for designs requiring increased signal speeds and better signal integrity than traditional E-Glass/epoxy substrate materials.
Scott Northrup, director of new business development at AGY, said: 'Substrate materials that provide low dielectric constant and low dissipation factor properties have become an essential element of high-speed digital systems such as mobile communication base stations, high-end routers and servers, and high-speed storage networks.
'As these systems move to higher processing speeds, substrates with low-loss properties are needed to ensure the speed and integrity of the signals,' he added. Low-loss laminates for high-speed applications have traditionally been produced in one of two ways. In one method, a higher performing epoxy resin system is used in conjunction with E-Glass. This approach limits the achievable Dk and Df properties.
The second method combines very low Dk/Df resins, such as PTFE, with ceramic filler and a much lower E-Glass content. While these systems can achieve much lower Df/Dk properties, they suffer from high material and processing costs. The low glass loading also reduces the dimensional stability of the laminate.
The use of L-Glass fibre overcomes these limitations by allowing epoxy resin systems to achieve much lower Dk/Df properties, and the PTFE-based systems to use a higher glass loading. At 10GHz L-Glass fibre has a dielectric constant of 4.86 and a dissipation factor of 0.0050, whereas E-Glass has a dielectric constant of 6.81 and a dissipation factor of 0.0060 at 10GHz. The coefficient of thermal expansion (CTE) of L-Glass fibre is 3.9ppm/C compared to 5.4ppm/C for E-Glass.
This makes L-Glass fibre a suitable material for use in IC packaging, where CTE mismatches with silicon are magnified due to the thermal environment and can cause defects. AGY's L-Glass fibres will be available in a variety of yarn counts, that will allow production of low-loss fabrics analogous to styles 106, 1080, 2113/2313 and 2116. Additional yarn counts can be produced as needed to meet market demands.
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