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Subject:	[geda-user] PCB antenna question
From:	"Richard Rasker (rasker AT linetec DOT nl) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Date:	Sat, 28 Jan 2017 13:41:00 +0100
Organization:	Linetec
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Hello,

Lately, I started on projects involving Bluetooth and UHF RF, and for
simplicity and cost, I'd like to use PCB antennas.

While doing this, I ran into a question: how can I 'properly' define PCB
antenna elements/footprints? When I draw a loop antenna and convert it
into an element, things get problematic: each line segment is designated
a separate pad number, which produces error messages as soon as the
element is entered in a netlist (also see attached example).

I tried redefining these lines in several ways using a text editor (by
changing the pad numbers(*)), but PCB insists on treating the whole
thing as a collection of shorted nets -- which of course is technically
correct, but not what is desired.

Simply said: Is there a way to create a 'shorted' element that isn't
treated as a short circuit by PCB?


*: A related question: when defining connector footprints, I usually
define all mechanical metal parts as pin/pad 0. Would it be possible in
principle to modify PCB's behaviour to treat these zero pins/pads as
'floating', so that they don't produce error messages when connected to
an arbitrary net, or, alternatively, are left unconnected? Or would that
raise other problems?

Thanks already,

Best regards,

Richard Rasker

Linetec
-- 
Linetec Translation and Technology Services
Vleerkottelanden 14
7542 MJ  Enschede
The Netherlands

+31-53-4350834

http://www.linetec.nl/
e-mail: rasker AT linetec DOT nl


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Content-Type: application/x-pcb-footprint; name="ANT_LOOP_TEST_1"
Content-Disposition: attachment; filename="ANT_LOOP_TEST_1"
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Element["" "" "" "" 76.0000mm 47.0000mm 0.0000 0.0000 0 100 ""]
(
	Pad[1.0000mm -7.0000mm 1.0000mm 0.0000 10.00mil 20.00mil 0.0000 "" "1" ""]
	Pad[1.0000mm -7.0000mm 23.0000mm -7.0000mm 10.00mil 20.00mil 0.0000 "" "2" "edge2"]
	Pad[23.0000mm -7.0000mm 23.0000mm 18.0000mm 10.00mil 20.00mil 0.0000 "" "3" ""]
	Pad[1.0000mm 18.0000mm 23.0000mm 18.0000mm 10.00mil 20.00mil 0.0000 "" "4" "edge2"]
	Pad[1.0000mm 12.0000mm 1.0000mm 18.0000mm 10.00mil 20.00mil 0.0000 "" "5" "edge2"]
	Pad[-1.0000mm 0.0000 1.0000mm 0.0000 2.0000mm 20.00mil 2.2540mm "1" "6" "square"]
	Pad[-1.0000mm 12.0000mm 1.0000mm 12.0000mm 2.0000mm 20.00mil 2.2540mm "2" "7" "square"]

	)

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