How to create copper split rings on the top layer

[Anonymous]

Hi,

I am just a beginner at using Eagle, nevertheless have spent considerable time trying to figure out how to create double split rings with copper tracks in Eagle. Is there an easy way to do so (image 0 below of what I want to do)?

I have tried the following methods, to no avail.

1. Using the circle tool - cannot edit the circle to form the split with polygon cutout or tRestict and cannot assign signal name. The circle is treated as an uneditable shape.

2. Creating circles with the polygon tool - I created a circle with the polygon tool by alternating between wire bend style 0 and 4 and making the polygon solid. I then did the same with a polygon circle of smaller radius and set it to cutout polygon. The problem with this is that I cannot place my smaller split ring within the cutout region of the inner larger split ring.

3. Using the arc tool - I could make the shape of the ring, except when I try to cut out the split it behaves the same as the circle - it is uneditable (polygon cutout & tRestrict rectangle do not react with the arc).

4. Single solid polygon, using tRestrict - this is the closest I've come to as a solution, where I use circles in tRestrict to cut out the spaces between the solid rings. Problem is, the boundaries of tRestrict form really jagged edges, and I need it to be smooth (as it is a resonator).

I have spent far too long trying to figure this out and am currently at a mental block. Any help would be appreciated.

[hudriwudri]

Although some people will grumble, the easiest solution seems to be to edit the xml file directly (make backups first bla bla bla). Look for the <signal name="yoursignal" section and add two new polygons in it. In my example, the circles have 10, 9, 8 and 7 mm diameter, and a 2 degree opening. Coordinates derived using a calculator (grumble grumble):

<signal name="ARC">
<polygon width="0.1" layer="1">
<vertex x="29.998" y="20.175" curve="179"/>
<vertex x="10" y="20" curve="179"/>
<vertex x="29.998" y="19.825"/>
<vertex x="28.999" y="19.825" curve="-179"/>
<vertex x="11" y="20" curve="-179"/>
<vertex x="28.999" y="20.175"/>
<vertex x="29.998" y="20.175"/>
</polygon>
<polygon width="0.1" layer="1">
<vertex x="12.001" y="20.14" curve="-179"/>
<vertex x="28" y="20" curve="-179"/>
<vertex x="12.001" y="19.86"/>
<vertex x="13.001" y="19.86" curve="179"/>
<vertex x="27" y="20" curve="179"/>
<vertex x="13.001" y="20.14"/>
<vertex x="12.001" y="20.14"/>
</polygon>
</signal>

A little bit better would be to create a custom package, also using the same polygons.

[jorge_garcia]

Hi @Anonymous,

I hope you're doing well today. This is actually not to horrible to make but you have to do some math. See the attached Image and the information in the post on this thread

https://forums.autodesk.com/t5/eagle-forum/help-needed-with-creating-a-circular-power-plane/m-p/7216...

You'll have to modify the instructions slightly but I think you'll get the general idea from them. Feel free to ask if you need any other clarification.

Please accept as solution if my post fully resolves your issue, or reply with additional details if the problem persists.

Best Regards,

[Anonymous]

Hi @hudriwudri

Thanks for your solution. Quick question, where do I find the xml file to edit and add the polygons?

Regards, Billy.

[Anonymous]

Hi @jorge_garcia

In the other forum you suggested to draw the ring via the following method:

Ring creation method

I would like to know how to do this, as whenever I try to attempt anything like this, the two splits which I would like in my rings are not parallel as such:

Regards, Billy.

[Anonymous · Accepted solution]

I managed to solve this problem by importing into Eagle a .dxf file created in AutoCAD via the command "run import-dxf-1_6" after downloading the UDP file import-dxf-1_6 and placing it in the UDP folder found in directory containing eagle.

Thank you @hudriwudri and @jorge_garcia for your time.