Ground plane settings for RF?

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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0 clem57 over 10 years ago

HOW-TO: Polygons and ground fills for PCBs in Eagle | Dangerous Prototypes
or https://www.sparkfun.com/tutorials/115
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0 Former Member over 10 years ago in reply to clem57

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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0 autodeskguest over 10 years ago in reply to Former 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
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0 autodeskguest over 10 years ago in reply to Former 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
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Vote Up 0 Vote Down

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