What makes RF/microwave PCB special than other conventional ones?

We are a home appliances company and now we plan to develop a microwave oven. PCB is the key part of the device and we know it is not a duck soup. What is the differences between microwave PCB and common PCB?

When working with high-frequency signals design, the placement and routing of PCB traces are of greater importance than DV or low-frequency circuits.

When traces are laid down parallel to each other (either adjacent or on opposite sides/different layers of the board) they form a very tiny capacitor.

When traces are routed around components they can form very tiny inductors.

Now, as anyone who knows about AC circuits will attest, two things are unavoidable:

  1. Capacitive reactance is inversely proportional to frequency.
  2. Inductive reactance is directly proportional to frequency.

Both of the above are measured in Ohms (as they are a measure of a circuit’s resistance to current flow).

Thus, those tiny capacitors created by the parallel traces will cause leakage. What’s more, the interference and the inductors created by wiggling traces around components will introduce a non-linear resistance into the circuit (and could even act as an antenna, producing undesirable interference elsewhere).

These issues are sometimes used for constructive purposes to reduce noise but make HF circuit design more of a challenge.

For example, you might see traces that are deliberately “wiggly”.

Read More: 16 Steps On Microwave PCB Design

#Consumer Electronic  #PCB Design

Picture of Oliver Smith

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.
Picture of Oliver Smith

Oliver Smith

Oliver is an experienced electronics engineer skilled in PCB design, analog circuits, embedded systems, and prototyping. His deep knowledge spans schematic capture, firmware coding, simulation, layout, testing, and troubleshooting. Oliver excels at taking projects from concept to mass production using his electrical design talents and mechanical aptitude.

What Others Are Asking

How fast can through hole PCBs run?

I’m trying to rate the speed of my pathetic attempts at electronics. So sticking specifically to through hole construction with DIP packages. A soldered PCB like mine can operate at 5MHz. Mine is slower. Why?

How much larger should a plated-through hole be than lead diameter to get good solder wetting?

I’m designing a new PCB where I have a whack of connectors that have to line up with the metalwork. There are some problematic connectors. All 4 pins are round. I want to have the holes as small as possible while allowing for good solder adhesion over the full length of the pin. I’m looking for guidance on how much clearance around the component lead I should have in order to get good solder wetting and adhesion.

Read Detailed Advice From Blog Articles

The Ultimate Guide to PCB Layout Design
Ryan Chan

The Ultimate Guide to PCB Layout Design

PCB layout design is a key step in the manufacture of circuit boards. A reasonable PCB layout is conducive to controlling the production cost and

microwave pcb
Ryan Chan

16 Steps On Microwave PCB Design

Printed circuit boards with high-speed chips and microwave PCB structures have numerous parameters that differ significantly from those of conventional, rigid and flexible printed circuit

Scroll to Top