Cost-Effective Laminates for 76 to 81 GHz Automotive Radar Sensor Applications

Rogers Corporation has introduced a new addition to its RO4000 Series of high frequency laminates. The RO4830 is a thermoset circuit material that offers 76 to 81 GHz auto radar sensor designers a low-cost but high performance solution. RO4830 laminates have a lower price point and 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, the RO4830 laminates are suited for cap layers on FR-4 multi-layer PCB designs. The optimized resin, glass and filler content of the 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.

These high frequency thermoset laminates are available in standard panel sizes of 12 x 18 in. (305 x 457 mm), 24 x 18 in. (610 x 457 mm), and 48 x 36 in. (1220 x 914 mm) with 0.5 oz. (18 µm) or 1.0 oz (35 µm) reverse-treated EDC foil.

Key Features:

  • RO4000 Series Thermoset Platform
  • Optimized Filler, Resin & Glass Composite System
  • Reverse Treated Smooth LoPro Copper Foil
  • Optimized Filler & Flat Glass

Benefits

  • Reduced Overall Cost of PCB Manufacturing versus PTFE Laminate Options
  • Dielectric Constant at 77 GHz of 3.2
  • Excellent Insertion Loss
  • Good Laser Drilling Performance & Consistent Within Sheet Dielectric Constant

Typical Applications

  • 76 to 81 GHz Automotive Radar Sensors

Click here to learn more about Rogers RO4000 Series of laminates.