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In-Reply-To: <BE34779D-6F0C-4F10-86EC-1CDBCF220D0A@ece.orst.edu>

From: "Erich Heinzle (a1039181 AT gmail DOT com) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>

Date: Thu, 3 Sep 2020 09:07:23 +0930

Message-ID: <CAHUm0tOC47ha4+BSwpVdbu7o4QWSgcuz-mr2eE19CTWxr_=LEA@mail.gmail.com>

Subject: Re: [geda-help] Linux - PCB Meander Antenna

To: geda-help AT delorie DOT com

Reply-To: geda-help AT delorie DOT com

--000000000000e2245805ae5d1e05
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pcb-rnd allows polygons within footprint elements, as well as lines and
arcs, which, in combination with terminals, can produce the sorts of
structures you are playing with more easily.

Importantly, there is also an "intnoconn" attribute that can be used on
copper features within the footprint

http://repo.hu/cgi-bin/pool.cgi?cmd=3Dshow&node=3Dintnoconn

That can be used, for example within a pcb spiral inductor, so that the
copper does not look like a short across the terminals.

With the gEDA PCB footprint data model, you will have to paint the features
with pads, will end up with a short with DRC, and will have a limited
ability to manipulate the solder mask over the features, if needed.


Regards,

Erich

On Thu, 3 Sep 2020 08:43 Roger Traylor (traylor AT engr DOT orst DOT edu) [via
geda-help AT delorie DOT com], <geda-help AT delorie DOT com> wrote:

> Gang,
> A quick question for PCB gurus:
>
> I have a =E2=80=9Cfolded F=E2=80=9D antenna for 2.4Ghz.  It has one open =
end, one input
> for the signal
> and one matching stub that is to be connected to ground.
>
> I drew this in PCB as a series of =E2=80=9Cpads=E2=80=9D. I attempted to =
make one pad =E2=80=9C1=E2=80=9D
>  the input,
> and pad =E2=80=9C2=E2=80=9D as ground.  gschem did not complain about the=
 symbol, but PCB
> complains
> about not being able to find pad "2" (the ground pin).
>
> Could this be because PCB sees all the pads overlapping as one pad?  If
> so, how can
> I overcome this problem?
>
> Thanks,
> Roger Traylor
>
> Footprint file is below:
>
> Element[0x00000000 "" "" "" 0 0 0 0 0 100 0x00000000]
> #Flipped Meander antenna for CC2500
> #R. Traylor 7.27.2020
> #50 ohm feed point is at end of segment 10
> #requires via to ground plane at bottom of segment 11
> #silk at bottom marks the edge of the ground plane
> #see TI/Chipcon Application Note AN043
> #This is the flipped version of the original meander antenna
> #
> (
> #              X1      Y1     X2       Y2    thick  clear  mask  name num=
b
>       flag
> # right side from origin
>         Pad[    0       0    8661       0    1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 0
>         Pad[ 8661       0    8661   -10394   1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 1
>         Pad[ 8661   -10394  18504   -10394   1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 2
>         Pad[ 18504  -10394  18504       0    1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 3
>         Pad[ 18504      0   27165       0    1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 4
>         Pad[ 27165      0   27165   -15512   1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 5
> # left side from origin
>         Pad[    0       0       0   -10394   1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 6
>         Pad[    0   -10394  -9843   -10394   1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 7
>         Pad[-9843   -10394  -9843       0    1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 8
>         Pad[-9843       0  -27559       0    1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 9
>         Pad[-18504    -787 -18504   -19281   1969     0   10000   "1"  "1=
"
> 0x00000100]  #segment 10
>         Pad[-26772    -787 -26772   -18504   3543     0   10000   "2"  "2=
"
> 0x00000100]  #segment 11
> #silk lines
>    ElementLine[-30197  2559  29725   2559  700]       #top
>    ElementLine[ 29725  2559  29725  -18307  700]      #right
>    ElementLine[-30118  2559 -30118  -18307  700]      #left
>    ElementLine[-30118  -18307 -29724  -18307  700]    #bottom starting
> from left
>    ElementLine[-23798  -18307 -20678  -18307  700]    #segment between
> vertical pieces
>    ElementLine[-16318  -18307  29564  -18307  700]    #right-most segemen=
t
> )
> # antenna layout
> #
> # * =3D origin
> #     -------s9--        *--s0---       ----s4--|
> #     |    |    |        |      |       |       |
> #     |    |   s8       s6      s1     s3       |
> #     |    |    |        |      |       |      s5
> #    s11   |    |---s7---|      |---s2---       |
> #     |    |                                    |
> #     |   s10                                   |
> #     |    |                                    |
> #     |    |
> #
>
>
>

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<div dir=3D"auto"><div>pcb-rnd allows polygons within footprint elements, a=
s well as lines and arcs, which, in combination with terminals, can produce=
 the sorts of structures you are playing with more easily.<div dir=3D"auto"=
><br></div><div dir=3D"auto">Importantly, there is also an &quot;intnoconn&=
quot; attribute that can be used on copper features within the footprint</d=
iv><div dir=3D"auto"><br></div><div dir=3D"auto"><a href=3D"http://repo.hu/=
cgi-bin/pool.cgi?cmd=3Dshow&amp;node=3Dintnoconn">http://repo.hu/cgi-bin/po=
ol.cgi?cmd=3Dshow&amp;node=3Dintnoconn</a><br></div><div dir=3D"auto"><br><=
/div><div dir=3D"auto">That can be used, for example within a pcb spiral in=
ductor, so that the copper does not look like a short across the terminals.=
</div><div dir=3D"auto"><br></div><div dir=3D"auto">With the gEDA PCB footp=
rint data model, you will have to paint the features with pads, will end up=
 with a short with DRC, and will have a limited ability to manipulate the s=
older mask over the features, if needed.</div><div dir=3D"auto"><br></div><=
div dir=3D"auto"><br></div>Regards,</div><div dir=3D"auto"><br></div><div d=
ir=3D"auto">Erich<br><br><div class=3D"gmail_quote" dir=3D"auto"><div dir=
=3D"ltr" class=3D"gmail_attr">On Thu, 3 Sep 2020 08:43 Roger Traylor (<a hr=
ef=3D"mailto:traylor AT engr DOT orst DOT edu">traylor AT engr DOT orst DOT edu</a>) [via <a href=
=3D"mailto:geda-help AT delorie DOT com">geda-help AT delorie DOT com</a>], &lt;<a href=
=3D"mailto:geda-help AT delorie DOT com">geda-help AT delorie DOT com</a>&gt; wrote:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex"><div style=3D"word-wrap:break-word;line=
-break:after-white-space">Gang,<div>A quick question for PCB gurus:</div><d=
iv><br></div><div>I have a =E2=80=9Cfolded F=E2=80=9D antenna for 2.4Ghz.=
=C2=A0 It has one open end, one input for the signal</div><div>and one matc=
hing stub that is to be connected to ground.</div><div><br></div><div>I dre=
w this in PCB as a series of =E2=80=9Cpads=E2=80=9D. I attempted to make on=
e pad =E2=80=9C1=E2=80=9D =C2=A0the input,</div><div>and pad =E2=80=9C2=E2=
=80=9D as ground. =C2=A0gschem did not complain about the symbol, but PCB c=
omplains=C2=A0</div><div>about not being able to find pad &quot;2&quot; (th=
e ground pin).=C2=A0</div><div><br></div><div>Could this be because PCB see=
s all the pads overlapping as one pad?=C2=A0 If so, how can</div><div>I ove=
rcome this problem?</div><div><br></div><div>Thanks,</div><div>Roger Traylo=
r</div><div><br></div><div>Footprint file is below:</div><div><br></div><di=
v><div><font face=3D"Courier" style=3D"font-size:12px">Element[0x00000000 &=
quot;&quot; &quot;&quot; &quot;&quot; 0 0 0 0 0 100 0x00000000]</font></div=
><div><font face=3D"Courier" style=3D"font-size:12px">#Flipped Meander ante=
nna for CC2500 =C2=A0</font></div><div><font face=3D"Courier" style=3D"font=
-size:12px">#R. Traylor 7.27.2020</font></div><div><font face=3D"Courier" s=
tyle=3D"font-size:12px">#50 ohm feed point is at end of segment 10</font></=
div><div><font face=3D"Courier" style=3D"font-size:12px">#requires via to g=
round plane at bottom of segment 11</font></div><div><font face=3D"Courier"=
 style=3D"font-size:12px">#silk at bottom marks the edge of the ground plan=
e</font></div><div><font face=3D"Courier" style=3D"font-size:12px">#see TI/=
Chipcon Application Note AN043</font></div><div><font face=3D"Courier" styl=
e=3D"font-size:12px">#This is the flipped version of the original meander a=
ntenna</font></div><div><font face=3D"Courier" style=3D"font-size:12px">#</=
font></div><div><font face=3D"Courier" style=3D"font-size:12px">(</font></d=
iv><div><font face=3D"Courier" style=3D"font-size:12px"># =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0X1 =C2=A0 =C2=A0 =C2=A0Y1 =C2=A0 =C2=A0 X2 =
=C2=A0 =C2=A0 =C2=A0 Y2 =C2=A0 =C2=A0thick =C2=A0clear =C2=A0mask =C2=A0nam=
e numb =C2=A0 =C2=A0 =C2=A0 flag</font></div><div><font face=3D"Courier" st=
yle=3D"font-size:12px"># right side from origin</font></div><div><font face=
=3D"Courier" style=3D"font-size:12px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[ =C2=
=A0 =C2=A00 =C2=A0 =C2=A0 =C2=A0 0 =C2=A0 =C2=A08661 =C2=A0 =C2=A0 =C2=A0 0=
 =C2=A0 =C2=A01969 =C2=A0 =C2=A0 0 =C2=A0 10000 =C2=A0 &quot;1&quot; =C2=A0=
&quot;1&quot; 0x00000100] =C2=A0#segment 0</font></div><div><font face=3D"C=
ourier" style=3D"font-size:12px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[ 8661 =C2=
=A0 =C2=A0 =C2=A0 0 =C2=A0 =C2=A08661 =C2=A0 -10394 =C2=A0 1969 =C2=A0 =C2=
=A0 0 =C2=A0 10000 =C2=A0 &quot;1&quot; =C2=A0&quot;1&quot; 0x00000100] =C2=
=A0#segment 1</font></div><div><font face=3D"Courier" style=3D"font-size:12=
px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[ 8661 =C2=A0 -10394 =C2=A018504 =C2=A0 =
-10394 =C2=A0 1969 =C2=A0 =C2=A0 0 =C2=A0 10000 =C2=A0 &quot;1&quot; =C2=A0=
&quot;1&quot; 0x00000100] =C2=A0#segment 2</font></div><div><font face=3D"C=
ourier" style=3D"font-size:12px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[ 18504 =C2=
=A0-10394 =C2=A018504 =C2=A0 =C2=A0 =C2=A0 0 =C2=A0 =C2=A01969 =C2=A0 =C2=
=A0 0 =C2=A0 10000 =C2=A0 &quot;1&quot; =C2=A0&quot;1&quot; 0x00000100] =C2=
=A0#segment 3</font></div><div><font face=3D"Courier" style=3D"font-size:12=
px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[ 18504 =C2=A0 =C2=A0 =C2=A00 =C2=A0 271=
65 =C2=A0 =C2=A0 =C2=A0 0 =C2=A0 =C2=A01969 =C2=A0 =C2=A0 0 =C2=A0 10000 =
=C2=A0 &quot;1&quot; =C2=A0&quot;1&quot; 0x00000100] =C2=A0#segment 4</font=
></div><div><font face=3D"Courier" style=3D"font-size:12px">=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 Pad[ 27165 =C2=A0 =C2=A0 =C2=A00 =C2=A0 27165 =C2=A0 -15512 =
=C2=A0 1969 =C2=A0 =C2=A0 0 =C2=A0 10000 =C2=A0 &quot;1&quot; =C2=A0&quot;1=
&quot; 0x00000100] =C2=A0#segment 5</font></div><div><font face=3D"Courier"=
 style=3D"font-size:12px"># left side from origin =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0=C2=A0</font></div><div><font face=3D"Courier" style=3D=
"font-size:12px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[ =C2=A0 =C2=A00 =C2=A0 =C2=
=A0 =C2=A0 0 =C2=A0 =C2=A0 =C2=A0 0 =C2=A0 -10394 =C2=A0 1969 =C2=A0 =C2=A0=
 0 =C2=A0 10000 =C2=A0 &quot;1&quot; =C2=A0&quot;1&quot; 0x00000100] =C2=A0=
#segment 6</font></div><div><font face=3D"Courier" style=3D"font-size:12px"=
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[ =C2=A0 =C2=A00 =C2=A0 -10394 =C2=A0-9843 =
=C2=A0 -10394 =C2=A0 1969 =C2=A0 =C2=A0 0 =C2=A0 10000 =C2=A0 &quot;1&quot;=
 =C2=A0&quot;1&quot; 0x00000100] =C2=A0#segment 7</font></div><div><font fa=
ce=3D"Courier" style=3D"font-size:12px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[-98=
43 =C2=A0 -10394 =C2=A0-9843 =C2=A0 =C2=A0 =C2=A0 0 =C2=A0 =C2=A01969 =C2=
=A0 =C2=A0 0 =C2=A0 10000 =C2=A0 &quot;1&quot; =C2=A0&quot;1&quot; 0x000001=
00] =C2=A0#segment 8</font></div><div><font face=3D"Courier" style=3D"font-=
size:12px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[-9843 =C2=A0 =C2=A0 =C2=A0 0 =C2=
=A0-27559 =C2=A0 =C2=A0 =C2=A0 0 =C2=A0 =C2=A01969 =C2=A0 =C2=A0 0 =C2=A0 1=
0000 =C2=A0 &quot;1&quot; =C2=A0&quot;1&quot; 0x00000100] =C2=A0#segment 9<=
/font></div><div><font face=3D"Courier" style=3D"font-size:12px">=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Pad[-18504 =C2=A0 =C2=A0-787 -18504 =C2=A0 -19281 =C2=A0 =
1969 =C2=A0 =C2=A0 0 =C2=A0 10000 =C2=A0 &quot;1&quot; =C2=A0&quot;1&quot; =
0x00000100] =C2=A0#segment 10</font></div><div><font face=3D"Courier" style=
=3D"font-size:12px">=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pad[-26772 =C2=A0 =C2=A0-78=
7 -26772 =C2=A0 -18504 =C2=A0 3543 =C2=A0 =C2=A0 0 =C2=A0 10000 =C2=A0 &quo=
t;2&quot; =C2=A0&quot;2&quot; 0x00000100] =C2=A0#segment 11</font></div><di=
v><font face=3D"Courier" style=3D"font-size:12px">#silk lines</font></div><=
div><font face=3D"Courier" style=3D"font-size:12px">=C2=A0 =C2=A0ElementLin=
e[-30197 =C2=A02559 =C2=A029725 =C2=A0 2559 =C2=A0700] =C2=A0 =C2=A0 =C2=A0=
 #top</font></div><div><font face=3D"Courier" style=3D"font-size:12px">=C2=
=A0 =C2=A0ElementLine[ 29725 =C2=A02559 =C2=A029725 =C2=A0-18307 =C2=A0700]=
 =C2=A0 =C2=A0 =C2=A0#right</font></div><div><font face=3D"Courier" style=
=3D"font-size:12px">=C2=A0 =C2=A0ElementLine[-30118 =C2=A02559 -30118 =C2=
=A0-18307 =C2=A0700] =C2=A0 =C2=A0 =C2=A0#left</font></div><div><font face=
=3D"Courier" style=3D"font-size:12px">=C2=A0 =C2=A0ElementLine[-30118 =C2=
=A0-18307 -29724 =C2=A0-18307 =C2=A0700] =C2=A0 =C2=A0#bottom starting from=
 left</font></div><div><font face=3D"Courier" style=3D"font-size:12px">=C2=
=A0 =C2=A0ElementLine[-23798 =C2=A0-18307 -20678 =C2=A0-18307 =C2=A0700] =
=C2=A0 =C2=A0#segment between vertical pieces</font></div><div><font face=
=3D"Courier" style=3D"font-size:12px">=C2=A0 =C2=A0ElementLine[-16318 =C2=
=A0-18307 =C2=A029564 =C2=A0-18307 =C2=A0700] =C2=A0 =C2=A0#right-most sege=
ment</font></div><div><font face=3D"Courier" style=3D"font-size:12px">)</fo=
nt></div><div><font face=3D"Courier" style=3D"font-size:12px"># antenna lay=
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t></div><div><font face=3D"Courier" style=3D"font-size:12px"># * =3D origin=
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=C2=A0 -------s9-- =C2=A0 =C2=A0 =C2=A0 =C2=A0*--s0--- =C2=A0 =C2=A0 =C2=A0=
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># =C2=A0 =C2=A0 | =C2=A0 =C2=A0| =C2=A0 =C2=A0| =C2=A0 =C2=A0 =C2=A0 =C2=
=A0| =C2=A0 =C2=A0 =C2=A0| =C2=A0 =C2=A0 =C2=A0 | =C2=A0 =C2=A0 =C2=A0 |</f=
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=C2=A0| =C2=A0 =C2=A0 =C2=A0 =C2=A0| =C2=A0 =C2=A0 =C2=A0| =C2=A0 =C2=A0 =
=C2=A0 | =C2=A0 =C2=A0 =C2=A0s5</font></div><div><font face=3D"Courier" sty=
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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
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ont></div><div><font face=3D"Courier" style=3D"font-size:12px">#</font></di=
v></div><div><span style=3D"font-size:12px"><br></span></div><div><div><br>=
</div></div></div></blockquote></div></div></div>

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Date:	Thu, 3 Sep 2020 09:07:23 +0930
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Subject:	Re: [geda-help] Linux - PCB Meander Antenna
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