Ultra-precision PCB Fabrication, High Frequency PCB, High Speed PCB, IC Substrate, Multilayer PCB and PCB Assembly.
The most reliable PCB custom service factory.
Microwave Tech

Microwave Tech

Microwave Tech

Microwave Tech

What is the difference between Rogers RO4350B and RO4835?
2021-08-24
View:58
Author:Belle

RO4350B hydrocarbon ceramics and RO4835 hydrocarbon ceramics belong to the RO4000 series of materials and belong to the civilian series. The RO4000 series is a hydrocarbon resin and ceramic filler laminate material. It has the ability to be compatible with FR4 mixed pressure, FR-4 processing technology, and lead-free soldering technology, ensuring that PCB processing plants only need to have lower processing capabilities and reduce The customer’s PCB processing cost, 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 The heat treatment ability of PTFE material will be better (heat dissipation coefficient 0.6W/m/°K), low Z-axis thermal expansion coefficient (31 ppm/°C), improve the reliability of the through hole, etc., and can ensure the radar front end and antenna at 24GHz The required excellent electrical properties. Moreover, it is also a UL 94V-0 flame retardant material, which further contributes to the safety of the radar system.

What is the difference between Rogers RO4350B and RO4835?

The biggest difference between the two is that RO4835 is added with antioxidants, which increases its oxidation resistance by 10 times compared with traditional thermosetting materials, and it meets the requirements of IPC-4103 (substrate specifications for high-speed and high-frequency applications). Rogers radio frequency sheet RO4835 is added with anti-oxidation materials, and its oxidation resistance is stronger than RO4350B. Except for the difference between Dk and Df, the temperature characteristics of Dk are relatively worse for products with glass cloth, and the requirements for the temperature range of the product are higher. The coefficient of thermal expansion becomes worse, especially in the z-axis, and the relative number of layers of the product will decrease. The phase characteristics of high frequency are relatively worse, and products with strict requirements on the phase should be avoided. The advantage is that the dimensional stability, hardness and water absorption of the product are relatively good.


The working frequency of 24G security radar system is 24~24.25GHz, with a total working bandwidth of 250MHz. It uses FMCW waveform to work. Due to its high frequency and short wavelength, it determines that the radio frequency front end and antenna of the radar system can only be used at high frequencies. High-frequency microwave materials, and the security industry is full of competition characteristics, so that high-frequency microwave materials not only need to have good performance, but also the price should be moderate, that is, high-frequency microwave materials with extremely high cost performance are needed.


ROGERS, an internationally renowned manufacturer and manufacturer of high-frequency microwave materials, focuses on the introduction of two high-frequency microwave PCB materials, RO4350B hydrocarbon ceramics and RO4835 hydrocarbon ceramics, for the 24G security radar market and for different use scenarios.