PCB News - 5G different frequency band PCB circuit board material selection

5G different frequency band PCB circuit board material selection

As 5G, the Internet of Things and other applications will adopt higher frequencies, from 3GHz to 6GHz or even 2-30GHz in the past, which will bring new technological trends for 5G antenna radio frequency materials. The following are some discussions on how to choose PCB circuit boardmaterials and their influence in different frequency bands of 5G:
If it is a 24GHz power amplifier, what material is recommended?
First consider the Rogers RO4350B/RO4835 material and its LoPro version. If the performance is insufficient, please consider upgrading the panel with less loss, such as RO3003.
Which substrate material is more suitable for the future millimeter wave antenna material of 5G?
5G antenna board (PCB circuit board) can focus on RO4730G3 material, which is a patented resin system of hydrocarbon hollow silicon ball filler, with excellent electrical, mechanical and thermal properties.

What is the difference between RO4450T™ and RO4450B™ and them?
In one hand, with different thicknesses, RO4450T material has 3 mils, 4 mils, and 5 mils, while RO4450B material has only 4 mils. On the other hand, there are slight changes and upgrades to rmula, such as better fluidity. .
What are the properties of TCDk restricted materials? Can you explain TCDk?
TCDk is the temperature coefficient of the material's dielectric constant, that is, how much the dielectric constant Dk becomes at high and low temperatures, which will affect the performance of the designed product at high or low temperatures. For example, a bandpass filter used for microstrip lines.
Generally speaking, using RA, RQ or RZ, the roughness of the copper foil is more accurate as the standard.
Copper foil roughness has different definitions, which are closely related to electrical performance. For example, loss is called RQ root mean square value, and other RA and RZ are usually given by copper foil supplier parameters.
Can you recommend PCB material suitable for 100GHz or above?
Please refer to RO3003 material, DiClad880 material, RT/duroid5880 material low loss high frequency chip, etc.
What material is recommended for 60-70GHz?
In addition, it is determined according to your specific application scenarios and indicators. Generally speaking, RO4350B/RO4835 and its LoPro version and other materials can be given priority, and then use RO3003 materials and other panels with less loss
What is the difference between dielectric constant (process) and dielectric constant (design)?
Under different measurement methods, it is a different result, among which DesignDk is a parameter used for actual circuit simulation and design.

Will LoPro technology affect the accuracy of line etching?
Compared with ordinary electrolytic copper foil, LoPro copper foil is smooth and helps fine circuit etching.
Using different forms of microstrip lines, strip lines and coplanar waveguides, is the use of Dk in the specification very different from the actual situation?
The Dkonthe specification usually refers to the Dk of the media. In different circuit structures, due to the electromagnetic field distribution, the equivalent Dk of the circuit is different. The design Dk in the Rogers specification is based on the value of the microstrip line structure.
How to ensure the performance of PCB circuit board laminates in different humidity environments? Our unit often encounters some differences in performance in winter and rainy days under relatively large environmental humidity.
Hygroscopicity is an important indicator of PCB raw materials. There is water absorption in the parameters of the material. The smaller the value, the better. The test methods are 23 degree water immersion for 24 hours and 50 degree water immersion for 48 hours. In addition, for sheets, the double 85 test may be more demanding.
Below 6GHz, the dielectric constant is usually 3~3.7. What are the main effects of choosing a dielectric constant? When designing the SIW filter, in order to reduce the size, can you choose a larger dielectric constant, such as RT/duroid601010.2LM material?
The difference in dielectric constant will result in a difference in line width, which will affect the line insertion loss. For antenna applications, the dielectric constant also indirectly affects the gain efficiency of the antenna. Using materials with high dielectric constants is a common way to reduce the size of circuits.