×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

*
*
*
*

Thanks. We have received your request and will respond promptly.

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

EMI Suppression Advice

thread1616-192140

EMI Suppression Advice

EMI Suppression Advice

(OP)
Hi,

I'm working on an enclosure that's operating at 8 Gig to 20 Gig frequencies, and we're having difficulties in the higher frequency ranges. We've used steel EMI spring products, fabric over foam, etc... and we're now looking at board level shielding devices, only catch is that there must be integrated heat sinks due to thermals. Anyone have experience with this? There are a few companies out there that offer cans that go over BGA's, but none that have integrated heat sinks. Is there a process that exists where we could possible spray a coat of conductive mat'l over the PCB?

Any advice will be appreciated.

Thanks.

RE: EMI Suppression Advice

What problem are you having at higher freq. ranges?  What compliance test are you trying to pass that makes a traditional faraday cage impossible?

My own experience with ~10 GHz clock signals has been that the only method that works is to take the heat out through copper llayers/thermal vias in the PCB or a slug heat sink on the solder side of the board.

Tyler Cox
Principal
Applied Product Design, LLC
Westtown, NY 10998

RE: EMI Suppression Advice

We have done custom shield/heatsink using die-cut compliant thermal pads over BGA devices.  Your production volumes would suggest the means of production for the shield/sink, but machining of alum is an option.  Question will be how you need to attach the box to your pcb, if screws are not acceptable

"You will master any feeling of inadequacy you may be having"
....from my fortune cookie @ the buffet!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login

Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close