RO4350B hydrocarbon ceramics and RO4835 hydrocarbon ceramics are both part of the RO4000 series of materials, belong to the civil series. The RO4000 series is a hydrocarbon resin and ceramic filler laminate material with compatible and FR4 mixing, FR-4 processing process, lead-free welding process capabilities, to ensure that PCB processing plants only need to have lower processing capacity, reduce customer PCB processing costs, and its low loss (media loss (Df) 0.0037@10GHz), dielectric constant temperature stability is better (500) The advantages of ppm/C@-50C to 150C), better heat treatment capability compared to conventional PTFE materials (heat dissipation coefficient 0.6W/m/K), and low Z-axis thermal expansion coefficient (31 ppm/°C) improve through hole reliability ensure excellent electrical performance required for radar front ends and antennas at 24GHz. It is also a UL 94V-0 flame retardant material, which further adds to the safety of radar systems. The biggest difference between the two is that RO4835 adds antioxidants that are 10 times more antioxidant than conventional thermoset materials and meet the requirements of the IPC-4103 (High-Speed High Frequency Substrate Specification). Rogers RF plate RO4835 adds antioxidant material with higher antioxidant properties than RO4350B. In addition to the Dk, Df difference, with glass cloth products, Dk's temperature characteristics are relatively poor, the temperature range of the product requirements are high. The coefficient of thermal expansion is different, especially the z-axis, and the relative number of layers of the product is reduced. The phase characteristics of high frequencies are relatively poor, and products with demanding phase requirements are best avoided. The advantage is that the product size stability, hardness absorption rate, etc. are relatively good. 24G security radar system operating frequency of 24 to 24.25GHz, a total of 250MHz operating bandwidth, using FMCW waveforms to work, because of its high frequency, wavelength characteristics, decided that the radar system RF front end and antenna can only use high-frequency microwave materials, and security industry is full of competitive characteristics, so that high-frequency microwave materials not only need good performance, but also the price is moderate, that is, the need for high cost-effective microwave materials. Rogers, an internationally renowned manufacturer of high-frequency microwave materials, focuses on the introduction of RO4350B hydrocarbon ceramics and RO4835 hydrocarbon ceramics, two high-frequency microwave PCB materials for the 24G security radar market and for different use scenarios.
