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| Copper foil from ebay |
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| cdev:
Kapton makes a great insulator and it withstands high temperatures, the problem is that its so thin that whatever the impedance you would get using it is likely to be unsuitable for RF. My guess is that it likely has a fairly high dielectric constant. As far as printing circuits (in an additive way) There is a group at Georgia Tech that has done a lot of research on printing things like RFID antennas (To power sensors using RF in the air) with conductive ink, and a lot of their research is on the web. You know that does work okay as a substrate for RF circuits is foam core/foam (double sided sticky) tape. And its likely fairly low loss. But very solder unfriendly - Another widely available rigid material thats easy to work with is cardboard. Ive built a number of antennas using combinations of copper tape, cardboard and aluminum foil. |
| thermistor-guy:
--- Quote from: cdev on November 05, 2018, 01:56:14 am ---Kapton makes a great insulator and it withstands high temperatures, the problem is that its so thin that whatever the impedance you would get using it is likely to be unsuitable for RF. My guess is that it likely has a fairly high dielectric constant. As far as printing circuits (in an additive way) There is a group at Georgia Tech that has done a lot of research on printing things like RFID antennas (To power sensors using RF in the air) with conductive ink, and a lot of their research is on the web. You know that does work okay as a substrate for RF circuits is foam core/foam (double sided sticky) tape. And its likely fairly low loss. But very solder unfriendly - Another widely available rigid material thats easy to work with is cardboard. Ive built a number of antennas using combinations of copper tape, cardboard and aluminum foil. --- End quote --- Hmm, I have a bunch of old business cards in good condition. Maybe I could punch them out to form a honeycomb pattern, and stack the cards inbetween tape layers (kapton or copper or ...)., to get the desired thickness/impedance, ideally forming a near-air dielectric. I can't help thinking there are some useful possibilities here, for low-cost prototyping. Some experimenting and testing required, obviously. |
| GigaJoe:
bought have this tape. it copper, no coating, solderable, very thin, expensive. often sell as guitar shielding .. |
| Mechatrommer:
--- Quote from: GigaJoe on November 05, 2018, 03:51:13 am ---bought have this tape. it copper, no coating, solderable, very thin, expensive. often sell as guitar shielding .. --- End quote --- the link the OP provided is cheap tape in a roll version. there is another china version 30cm x 20 cm about less than $5 per sheet. and then there is another "dupont pyralux" type (you can find in ebay) that is real expensive. are you talking about the china cheap version in the OP? or the pyralux version? the china version seems too good to be that kind of shiny uncoated. wait... here is the pyralux... https://www.ebay.com.my/itm/Pyralux-Kapton-Flexible-Printed-Circuit-Board-Material-Various-Models-9-x-12/153153567548?hash=item23a8a9fb3c:m:mZd9yxPw_PT3JDsXBsOafTw:rk:4:pf:0 |
| BurningTantalum:
I have used the cheap Chinese version in 4mm (?) widths. It solders OK if one is quick about it, and the glue is very sticky. I surrounded the bottom of my house walls (70 metres) with two runs of it spaced about 6mm apart, connected to an HV generator. This was the only way to stop a biblical invasion of Portuguese millipedes. The tape has lasted for 3 years without peeling off. BT |
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