rogers corporation announced the latest addition to its ro4000 series thermoset circuit materials: ro4830 high-frequency laminates. ro4830 laminates offer 76-to-81-ghz auto radar sensor designers a lower-cost-but-performance-competitive option. rogers ro4830 laminates are processed by means of standard epoxy/glass (fr-4) circuit fabrication methods, for lower overall production costs versus ptfe-based circuits.
available in dielectric thicknesses of 0.005 and 0.0094 inch, ro4830 laminates are suited for cap layers on fr-4 multi-layer pcb designs. the optimized resin, glass and filler content of ro4830 laminates translates to a relative dielectric constant (dk) of 3.2 at 77 ghz, close to matching that of the ptfe-based circuit materials typically used for millimeter-wave circuits.
at 76-to-81-ghz, thin laminate insertion loss is heavily influenced by copper foil roughness, and therefore ro4830 laminates are clad with rogers lopro® reverse-treated copper foil to achieve very low insertion loss of 2.2 db/inch for 5 mil laminates, as measured by the microstrip differential phase length method.
spread glass and a filler with a smaller and more uniform particle size distribution contribute to consistent within sheet dielectric constant as well as good laser drilling performance. the ro4830 laminates are based on the same anti-oxidant formula used in rogers ro4835™ laminates and are more resistant to oxidation than other hydrocarbon-based laminates.
rogers ro4830 high frequency thermoset laminates are available in standard panel sizes of 12 × 18 in. (305 × 457 mm), 24 × 18 in. (610 × 457 mm), and 48 × 36 in. (1220 × 914 mm) with 0.5 oz. (18 µm) or 1.0 oz (35 µm) reverse-treated edc foil.
|