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AWR1642: What's the reason that use 4mil RO4835 material?

Wesley He
Expert 6205 points
Part Number: AWR1642

Hi,

What's the reason that use 4mil RO4835 material? 

As we known, increase the thickness of the substrate to 8mil/10mil, then the RF trace will be wider, and the PCB manufacture will be easier.

So, what's the reason to use 4mil RO4835 material? Lower RF loss or any other reasons? Thanks for your help.

Regards,

Wesley

  • 0
    TI__Guru 58035 points
    Hello Wesley,
    With a 4mils RO4835 substrate the RF trace thickness is around 7mils for 50ohms , which is very easy to manufacture. Infact upto 4mils trace width has become very common now, so manufacturing should not be an issue due to trace width.
    Another aspect is that thinner substrate has lower surface roughness and hence lower losses. Thicker laminates can have more surface roughness, causing larger losses.

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    TI__Expert 6205 points
    Hi Vivek,
    Thanks for your reply.
    What I mean is the influence from trace tolerate. With a wider trace, the influence of the tolerate maybe small. So that's why customer wants to use 8mil/10mil.
    On your opinion, consider about the RF performance, 4mil will be a good chose?
    Thanks.

    Regards,
    Wesley
  • 0 in reply to Wesley He
    TI__Guru 58035 points
    Hello Wesley,
    Yes, thinner substrate is preferred for better RF performance.

    Regards,
    Vivek