The Result: Increased component density combined with easy installation after reflow.
The Situation: As high speed data bandwidth consumption has grown, delivery of video and telephony services has converged over internet protocol networks. To support this market need, network operators require more advanced broadband routers. Using a Converged Cable Access Platform (CCAP) architecture, these devices reduce the rack space required, power consumption and heat generated, while dramatically increasing data capacity. The circuit boards that drive these devices are expensive, densely packed and contain multiple multi-core processors and SDRAM chips.
As clock speeds and densities increased, the need for higher signal to noise ratios drove the need for EMI shielding on transceiver and clock components. Given the density of components and the frequent need for inspection and rework after reflow, traditional frame and lid EMI shielding solutions were not satisfactory.
Our Solution: Multiple-cavity GORE® SNAPSHOT® EMI Shields were selected to provide cross-talk protection for a bank of transceiver chips. Complex geometry GORE® SNAPSHOT® EMI Shields were designed to isolate clock components to preserve signal integrity. All shields were easily attached without the need for soldering using Gore’s patented solder sphere attachment mechanism after the reflow step simplifying inspection and rework of the board. Reworking a board after the shields were attached was also extremely easy, since the shields could be quickly and easily removed by hand to access the components under the shield and new shields could be attached without damaging the components or the board.
Result: Improved design flexibility for prototype and small quantity applications.
The Situation: Our customer develops prototypes and small quantities of handheld radios (less than 500 units) for defense applications. Key issues for this application include:
The customer had been soldering standard metal cans to the boards to provide board-level shielding. However, these shields were difficult to use, particularly when changes needed to be made during the design process. Additionally, the boards were expensive to tool, took longer to prototype, and reduced flexibility in designing the radio’s packaging.
Our Solution: GORE® SNAPSHOT® EMI Shields improve design flexibility and provide high quality signal performance up to 12 gigahertz. The customer can now focus on effective board design without being limited by the shape of traditional shielding cans. Our EMI Shields are flexible, multi-cavity shields that allow the customer to reduce package size by varying the height of the shield within each cavity. After working with our application engineers to design one radio’s board using Gore board-level EMI shields, this customer has adopted Gore’s technology to provide shielding on almost every new radio design.
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Result: Reduced interference with lightweight shielding for wireless communication devices.
The Situation: Our customer was developing a communication system to be worn by athletic coaches in all types of outdoor environments. The system included a headset and a wireless transmitter worn on the coach’s belt. Key issues for this application included:
The customer had previously used a combination of conductive coating, casting and gaskets for EMI shielding. However, this approach did not provide adequate shielding and resulted in a product that was too heavy for the user to wear.
Our Solution: GORE® SNAPSHOT® EMI Shields ensure excellent signal performance up to 12 gigahertz and improve shielding effectiveness by providing excellent signal isolation between critical areas. These lightweight, multicavity shields allowed the customer to minimize product size and weight by customizing the height and shape of the shields used in the transmitter.
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Result: Improved signal integrity in low-profile handheld devices for rugged environments.
The Situation: Our customer was developing a new generation of a handheld computer for use in rugged industrial environments. The device offered five separate radio interfaces — GPRS, CDMa, GPS, 802.xx WAN and Bluetooth. Key issues for this application include:
The device’s stack-up included a display, a keypad, multiple boards for processors, the radios and memory. The customer quickly realized that traditional cans would not meet the low-profile requirements for the device.
Our Solution: GORE® SNAPSHOT® EMI Shields improve shielding effectiveness by more than 10 dB, providing excellent signal isolation between critical areas. Using these flexible, multi-cavity shields,the customer was able to focus on effective PCB design and mechanical layout without being limited by the shape of traditional shielding cans. GORE® SNAPSHOT® EMI Shields reduced the product profile by varying the height and shape of each of the nine shields used in the handheld computer.
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