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Ground plane settings for RF? [message #161418] Wed, 17 June 2015 14:49 Go to next message
Michele Bertoni
Messages: 7
Registered: April 2014
Junior 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.

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Re: Ground plane settings for RF? [message #161421 is a reply to message #161418] Wed, 17 June 2015 16:38 Go to previous messageGo to next message
Clem Martins
Messages: 251
Registered: December 2014
Senior Member
HOW-TO: Polygons and ground fills for PCBs in Eagle | Dangerous
Prototypes (http://dangerousprototypes.com/2012/07/18/eagle-polygons/)

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Re: Ground plane settings for RF? [message #161424 is a reply to message #161421] Wed, 17 June 2015 17:42 Go to previous messageGo to next message
Michele Bertoni
Messages: 7
Registered: April 2014
Junior Member
Thanks, but I've already read similar tutorials.....
I've tryed to solve in this way:
1) set Clearance value to 0 mil (wire field) into net Design rules
2) set Isolate to 0.15mm into first ground plane (antenna ground plane)
2) set a second ground plane for remaining PCB with standard Clearance
value

I don't know if this way is the correct one.....

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Re: Ground plane settings for RF? [message #161429 is a reply to message #161424] Wed, 17 June 2015 23:16 Go to previous messageGo to next message
Paul Romanyszyn
Messages: 857
Registered: December 2004
Senior Member
On 06/17/2015 01:42 PM, Michele Bertoni wrote:
> Thanks, but I've already read similar tutorials.....
> I've tryed to solve in this way:
> 1) set Clearance value to 0 mil (wire field) into net Design rules
> 2) set Isolate to 0.15mm into first ground plane (antenna ground plane)
> 2) set a second ground plane for remaining PCB with standard Clearance
> value
>
> I don't know if this way is the correct one.....
>
> --
> To view any images and attachments in this post, visit:
> http://www.element14.com/community/message/152869
>
Did you use the net class functions. I don't know where you access it in
the newer versions.
Paul
Re: Ground plane settings for RF? [message #161436 is a reply to message #161418] Thu, 18 June 2015 11:29 Go to previous message
Chuck Huber
Messages: 601
Registered: October 2004
Senior Member
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
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