RF PCB and microwave PCB are a type of printed circuit boards which carry the RF or microwave signal. So, these types of PCBs usually work on megahertz to gigahertz frequency ranges. Hence, we use these frequency ranges in communication technologies from mobile phones to military radars.
1. Power Planes
The way you layout the power planes across a circuit board is very important. So, if you design the RF microwave PCB in such a way that power planes go around the edges of the board then you will face serious problems. So, it may lead to a significant amount of parasitic radiation.
Solution
Hence, you should run them between two ground planes. So that you may decouple the supply and the ground.
2. Decoupling and Circuit Loops
It is very important that you carefully place the decoupling components on an RF PCB. So that capacitive coupling doesn’t occur.
Solution
Hence, you should reduce the current loops by putting the decoupling caps to the ground near the pin. Therefore, you must ensure that every pin or port has its own via.
3. Thermal Relief
You have to consider the thermal stresses in the RF PCB design as well. So, the higher the frequency of the signal in an RF board the more prominent the thermal stresses.
Solution
Hence, you can avoid thermal stresses in an RF PCB by avoiding sharp changes in the trace width because it can negatively affect the RF signal. So, we must avoid the right angle turns and instead go for gradual and curved turns in the traces.
The material we use in the manufacturing of RF PCB and microwave PCB mostly depends on the application. So, you can use the following chart to identify the suitable RF PCB material for your desired application.
| Applications | Materials | Characteristics |
|---|---|---|
| Consumer Electronics | RO3006 | Cost-effective with reliable thermal and electrical characteristics |
| RO3010 | ||
| RO4835 | ||
| Military/Aerospace | RT/ Duroid | Best thermal and electrical performance. Excellent environmental durability. |
| RO4000 | ||
| Medical | RO4350B | A wider range of properties which are suited for various types of medical devices. |
| Industrial | RO4835 | Excellent durability. Improved environmental resistance. |
| XT/ Duroid | ||
| RO4350B |
We have summarized the specifications and capabilities of these PCBs. So, you can consult the following chart.
| Dielectric Constant | 3.50 |
| Coefficient of Thermal Expansion | 46 ppm/°C |
| Dimensional Stability | ＜0.5mm/m |
| Moisture Absorption | 0.06 % |
| Thermal conductivity | 0.73 W/m/°K |
| Electrical Strength | 30.2 KV/mm |
| Frequency | 104 – 108 Hz |
MOKO Technology is the top RF PCB manufacturer and we also produce a Microwave circuit board. We have a highly sophisticated production facility and a dedicated R&D team. Hence, we have the mass production capacity and we assure you to provide high-quality PCBs in high volumes. We have an amazing track record, years of experience, and an amazing reputation. Our products and services are of premium quality and we assure a high degree of reliability. So, feel free to contact us for placing your order today.