Hello everyone,
In order to solve some mechanical issues, we want to route the microstrips of a RF board through internal metal planes.
We know that as general rule all RF signals must be routed on top metal plane with a underlying ground plane. Therefore, we do not know the consequence of a possibile routing through a internal metal plane, letting route the RF signal through a via-hole.
Do you have any advices about this topic?
Many thanks.
Regards,
What is the operating frequency ?? If it's really high, it will create a discontinuity and consequently a strong reflection at that point.
I also depends on the substrate thickness and via's diameter,plating thickness,plating materiel and quality.There will absolutely be a reflection in any event.
What is the operating frequency ?? If it's really high, it will create a discontinuity and consequently a strong reflection at that point.
I also depends on the substrate thickness and via's diameter,plating thickness,plating materiel and quality.There will absolutely be a reflection in any event.
yes that is a possibility. Run a stripline 50 ohm line in the middle of the board. You will need a TON of via holes on either side of the line to contain the energy. And make the run as short as possible, as it will be lossy.
What i do often is just put a rectangular notch in the metal cover, and pass regular microstrip thru it. Since the notch is very small, RF does not leak out much.
What i do often is just put a rectangular notch in the metal cover, and pass regular microstrip thru it. Since the notch is very small, RF does not leak out much.