Actions
Forum Thread Details
  • State Not Answered
  • Replies 4 replies
  • Subscribers 173 subscribers
  • Views 427 views
  • Users 0 members are here
Related

Ground plane settings for RF?

Former Member

Hi guys, I'm trying to desing PCB for RF applications and I'm getting confused about ground plane....

My track is 0,75mm width and I need 0,15mm space from surrounding ground plane (to achieve specific track impedence).

I design ground plane but even setting Isolate to 0 value I still have more than 0,15mm spacing from ground; so I need to set Clearance value to 0,15mm into design rules, but in this way all tracks of board get spaced of 0,15mm.

How can I set specific spacing ONLY for specifico polygon?

Thanks.

Parents
  • 0

     

    Can you add a second ground polygon immediately surrounding the 0.75mm

    track?  This would allow you to set the spacing for the portion of the

    ground plane surrounding the track different than that of the overall

    ground plane.  The DRC settings would have to be the lesser of the two,

    of course.

     

     

    On 06/17/2015 10:49 AM, Michele Bertoni wrote:

    Hi guys, I'm trying to desing PCB for RF applications and I'm getting

    confused about ground plane....

    My track is 0,75mm width and I need 0,15mm space from surrounding ground

    plane (to achieve specific track impedence).

    I design ground plane but even setting Isolate to 0 value I still have

    more than 0,15mm spacing from ground; so I need to set Clearance value

    to 0,15mm into design rules, but in this way all tracks of board get

    spaced of 0,15mm.

    How can I set specific spacing ONLY for specifico polygon?

    Thanks.

     

    --

    To view any images and attachments in this post, visit:

    http://www.element14.com/community/message/152867

     

     

Reply
  • 0

     

    Can you add a second ground polygon immediately surrounding the 0.75mm

    track?  This would allow you to set the spacing for the portion of the

    ground plane surrounding the track different than that of the overall

    ground plane.  The DRC settings would have to be the lesser of the two,

    of course.

     

     

    On 06/17/2015 10:49 AM, Michele Bertoni wrote:

    Hi guys, I'm trying to desing PCB for RF applications and I'm getting

    confused about ground plane....

    My track is 0,75mm width and I need 0,15mm space from surrounding ground

    plane (to achieve specific track impedence).

    I design ground plane but even setting Isolate to 0 value I still have

    more than 0,15mm spacing from ground; so I need to set Clearance value

    to 0,15mm into design rules, but in this way all tracks of board get

    spaced of 0,15mm.

    How can I set specific spacing ONLY for specifico polygon?

    Thanks.

     

    --

    To view any images and attachments in this post, visit:

    http://www.element14.com/community/message/152867

     

     

Children
No Data