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Electromagnetic interference (EMI) is an existential threat in RF mission critical applications such as defense communications, aerospace avionics, medical imaging and nuclear monitoring. One breached signal may lead to a chain of disastrous failure or safety-related violations. In commercial settings, shielding of mission-critical installations is needed on an almost theoretical level. We design superior shielding refinements at the RF expertise of more than 20-years, producing shielding that offers no compromising protection in our product, Linkworld. In this guide, four vital shielding technologies of mission-critical environments are discussed.
Advanced Conductor Materials and Plating Systems
The best place to start with superior shielding is with materials that are optimized for conductivity. Silver plated copper conductors are rated as the most electrically conductive conductors in the market with significantly higher performance than those silver plated with tin or nickel. Silver characteristic of being a conductor with a conductivity that is about 6 percent higher than that of pure copper and 60 percent higher than that of tin reduces surface resistance and increases the use of the conductor as a skin-effect device. Triple-layer plating systems (copper, nickel, and then silver or gold) are used in harsh environments to combine conductivity of the noble metals and resistance to corrosion. High quality connecting devices use stainless steel couplings that do not gall and allow continuity in the flow of electricity using special contact fingers. These advanced material systems are employed in the mission-critical product lines at Linkworld where all the elements manage to add up when it comes to the shielding effectiveness of the entire product.
360-Degree Shielding and Contact Geometry
Unintended slot antennas are produced by discontinuous shielding and either radiate or admit interference. To do away with discontinuities, exactly mechanical design is necessary. 360-degree continuous shielding means that the connector interface has electrical contact over the entire circumference, not necessarily by using a machined mating surface. Multi-finger contact designs are used to obtain redundancy and contact force under mechanical stress during vibration or thermal cycling. Finger shaped shielding that is spring loaded is fitted to special connectors to counteract wear after a thousand or more mating cycles. The transition between cable shield and connector is also the most critical; crimp sleeves and 360 degrees solder terminations are full-coverage so that the shielding continues seamlessly. Linkworld is optimizing these geometries to realize a greater shielding than 90 dB, over the range of operation.
361-Advanced Cable Constructions for Maximum Attenuation
Common single-shielded cables are not a good way of protecting mission-critical installations. Triple-shielded cables are a combination of inner foil shields with several layers of braids with a shielding effectiveness of 90-100 dB. Foil layers are totally covered against high-frequency electric fields, and braided layers are low-resistance conductors of magnetic field coupling, and bring mechanical strengths. Ultimate shielding is provided by semi-rigid cables with solid copper outer conductors, which provide effectively complete isolation. Such constructions are necessary in cases where the slightest leakage may invalidate delicate measurements or disclose the system parameters. Dual dielectric constructions are of particular importance to special cables to achieve optimum electrical performance and shielding and mechanical protection is provided by armored jackets. Assemblies by Linkworld are bespoke constructions that are designed according to the mission needs.
System-Level Integration and Grounding Strategies
Shielding at the component level should be incorporated in coherent system-level strategy. Poor grounding or installation may invalidate even the state of the art components. In RF systems, shields are usually grounded on either end to provide a good shield effect at high frequencies where care should be taken to avoid ground loops by ensuring that the system architecture avoids ground loops. Bonding method is used to provide connector shields with low-impedance conductors to equipment chassis and conductive finishes in conjunction with appropriate torque ensures good contact. Exposed interfaces are covered by shielded dust caps in unmated connectors. Field assembly procedures must be documented and performed by trained personnel to preserve shield integrity. Linkworld also offers technical assistance for mission critical installations such as grounding and training so that our technological parts can perform their maximum protective benefits.
Mission-critical applications are unique applications that require perfection in all aspects, including the purity of materials, and the installation of the system. High-performance conductor materials, discontinuous shielding designs, multi-layers cable structures, and considerate designs build protective casings that ensure signal behavior in the most challenging environments. Linkworld offers high-performance shielding solutions to its defense, aerospace, medical, and industrial clients with more than twenty years of RF manufacturing wisdom and substantial emphasis on mission critical applications. Get in touch with us regarding your shielding needs that are mission critical.