Rogers RO4350 High Frequency PCB
Line Width : 3MIL ;
Line Spacing : 4.5MIL ;
Drilling Diameter : =0.3mm ;
Processing Size : 800 * 900mm;
Plate Thickness : 3mm ;
Layers : 8 layers;
Special Process : Thick gold plate, ultra thick plate, depth control drilling, back drilling, hole filling electroplating, copper slurry plug hole, mechanical blind hole, etc.
Surface Treatment Processes : Include OSP, gold precipitation, silver precipitation, tin precipitation, gold plating, pure gold plating, thick gold plating, nickel palladium gold plating, nickel plating, tin plating, tin spraying, etc.
RO4350B hydrocarbon ceramics and RO4835 hydrocarbon ceramics both belong to the RO4000 series of materials, belonging to the civilian series. RO4000 series is a hydrocarbon resin and ceramic filler laminate material, which is compatible with FR4 mixing and FR-4 processing, lead-free soldering process capability, to ensure that PCB processors only need to have lower process capability to reduce customer PCB processing costs, and its low loss (dielectric loss (Df) 0.0037@10GHz), dielectric constant temperature stability is better (50 ppm/°C@-50GHz). Processing capabilities, reduce customer PCB processing costs, and its low loss (dielectric loss (Df) 0.0037 @ 10GHz), better dielectric constant temperature stability (50 ppm/°C @ -50°C to 150°C), compared to traditional PTFE materials heat treatment capabilities will be better (thermal coefficient of dissipation of 0.6W / m / ° K), low Z-axis coefficient of thermal expansion (31 ppm / ° C) to improve the thermal stability of the laminate. The low Z-axis coefficient of thermal expansion (31 ppm/°C) improves the reliability of the through-hole, which ensures the excellent electrical properties required for radar front-ends and antennas at 24 GHz. It is also a UL 94V-0 rated flame retardant material, which further adds to the safety of the radar system.
The biggest difference between the two is the addition of antioxidants to RO4835, which improves oxidation resistance by a factor of 10 compared to traditional thermoset materials and meets the requirements of IPC-4103 (Specification for High-Speed, High-Frequency Substrates) Rogers RF sheet RO4835 adds antioxidant materials, which are more resistant to oxidation than RO4350B. In addition to the difference in Dk, Df, products with glass cloth, the temperature characteristics of Dk become relatively worse, requiring a higher temperature range for the product. The coefficient of thermal expansion deteriorates, especially in the z-axis, and the relative number of layers of the product decreases. The phase characteristics of high frequency become relatively poor, and it is better to avoid the use of products with harsh requirements on phase. The advantage is that the dimensional stability of the product, hardness absorbency, etc. are relatively good.
24G security radar system operating frequency of 24 ~ 24.25GHz, a total of 250MHz operating bandwidth, the use of FMCW waveforms for work, due to its high frequency, short wavelength characteristics, determines the radar system RF front-end and antenna can only be used in the high-frequency microwave materials, and the security industry is full of competition, making high-frequency microwave materials not only need to be good performance, but also the price to be Moderate, that is, the need for cost-effective high-frequency microwave materials.
Internationally renowned high-frequency microwave materials production and R & D manufacturers ROGERS, for the 24G security radar market, for different use scenarios, focusing on the introduction of RO4350B hydrocarbon ceramic and RO4835 hydrocarbon ceramic two kinds of high-frequency microwave PCB materials.