The space between copper planes can act as waveguides for RF frequencies. It makes trace impedance changes and signal losses.
To cut such waveguide effect, put vias, which is essentially a copper cylinder.
When the distances between vias are small enough compared to the wavelength, the board is like continuous copper material, instead of waveguide.
Lees verder: Prototype PCB-assemblage
#PCB-ontwerp
I have three through-hole PCBs that are missing front and back solder mask openings for two of the components. The solder mask (usually green) is covering the front and back solder pads. All other pads for all other parts are exposed. Is there a good way to remove the solder mask so that I can solder the components to the board?
I am getting a PCB manufactured for a project that I am working on. One of the parts, the A4950 motor driver, has a “pad” on the bottom, which is meant to be soldered to GND of the PCB for thermal dissipation. I was thinking about the prototyping, and I am unsure how I would go about (using a soldering iron), soldering the pad on the bottom.
Mijn PCB-ontwerpsoftware wordt geleverd met een aantal bibliotheken die enkele algemene componenten bevatten, zoals chipweerstanden en condensatoren. ik heb opgemerkt, echter, dat het voetafdruklandpatroon voor de 0805 resistor is not identical to the 0805 condensator. Is there a “best standard”? IPC-7351, IPC-SM-782, or what?
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