Radio Frequency and microwave PCBs are a type of special PCB designated to operate the RF or microwave signal. Therefore, these types of PCBs normally used in the application of high frequency signal transmission around megahertz to gigahertz frequency ranges. So, this type of PCB with its material is widely used in communication technologies such as mobile phones, military radars, and drone.
Highlighted Features and Benefits
- RF PCB board and microwave circuit board can work on medium frequency to extremely high frequency
- Due to the base material’s high performance of heat transmission, it enables them to work at high temperatures.
- It’s dielectric constant and a low loss tangent result in Minor impedance affection to the signal travels path though.
- Can be combined with FR4 laminate material, hence It is possible to generate a multilayer board stack up. Therefore, it can come to complex circuitry to smaller boards size. And this provides optimal performance and are cost-effective.
- As it can be fabricated with FR4 material to generate as multilayer hybrid PCB board, so, it is easier and most possible to assemble fine pitch components onto the board.
Common Issues and Solutions
|Power Planes||Usually, there are many problems such as parasitic effect and radiation loss because of the high frequency, which were discussed in the paper. Therefore, you would face serious problems of parasitic radiation. If you design the RF microwave circuits PCB by this way that power planes go around the edges of the board.||You can layout them between two ground planes. So that you may decouple the power supply layer and the power ground layer.|
|Ground loop rules||The minor wire loops, the less radiation and interference.|
It is very important that PCB designer need carefully to place the decoupling components on a RF circuit PCB. So that capacitive coupling will be eliminated..
|Therefore, PCB designer should optimize the current loops by putting the decoupling caps to the ground close to the pin. Hence, you must ensure that each pin or port has its own independent via hole’s path.|
|Thermal Relief||Another factors you must have to consider is the thermal stresses in the RF PCB design, too. Thus, the higher the frequency of the signal from an RF board, the more prominent the thermal stresses will occur.||However, you can avoid thermal stresses in a RF PCB by avoiding physical sharp changes in the trace width because it could negatively affect the radio frequency signal. So, you must avoid the right angle turns and instead of it by going for gradual and curved turns in the traces.|
Or, you can design it by another solution that to embed a copper coin (Embedded Copper coin and RFI Metal Backed PCB) near to some critical components or ICs that you need to have heat thermal transmission.
Material Selection Reference
There are several types of RF material available for electronic designer to choose. However, which material should be selected mostly depends on the application of the electronic devices.
So, you can use the following chart to identify the suitable RF PCB material for your desired application.
The material list in below tables could provide general recommendation to PCB designer’s choice for their specific project.
|RF Application||RF Materials||Bonding Materials||Attributes&Characteristics|
|RO3000 Series Bondply|
|Cost effective with dependable electrical and thermal characteristics|
|RO4450B/ RO4450F||The best in electrical and thermal performance and environmental durability|
|High Power Applications||6035HTC|
|Superior thermal management|
|Medical||RO4350B||RO4400 Bondply / 2929 Bondply||Versatile high performance properties to suit a range of device types|
|RO4400 Bondply||Excellent electrical performance compatible with standard manufacturing processeses|
|2929 Bondply RO4400 Bondply||Excellent durability and environmental resistances, including oxidation|
Weller Technology is the top RF PCB manufacturer in china as well as professional in producing Microwave circuit board. We have dedicated R&D team and advanced production equipment to make sure the boards are fabricated to high quality standards and on-time.
Contact us freely if you are finding a capable of RF PCB manufacturer