Does anybody know the dielectric constant and loss tangent of photopaper?
I would be tempted to use viewgraph plastic sheets instead of paper:
Hi
are you having access to Vector Network Analyser.. kindly check this link http://www.home.agilent.com/upload/cmc_upload/All/GTL91.pdf?&cc=IN&lc=eng
Idea is draw the microstrip line of known width and length, Measure scattering parameters with VNA. Then dielectric constant could be found.
One more paper is with me, which describes using VNA for measuring dielectric constants, if you wish, i can send..
I am using 3.2 at 1GHz. what u suggest.The table in the material science script from the university days has an entry for "paper":
1MHz: epsr=2.99 tand=380e-4
10GHz: epsr=2.62 tand=403e-4
I am planning to use ink from cabot. which ink you suggest?notice that even small amounts of moisture in the paper can strongly affect the dielectric constant
BTW, what kind of silver ink you use (producer)? In our company we use an expensive Japanese printer for printing conductive tracks with resolution of 5um
yes, we can print on one side of pcb board but as these inks are expensive so in case of PCB board milling or other etching methods are preferable.This has got me thinking, could you print a real pcb with this ink? They apparently have printers where you can manually feed cardstock in one sheet at a time. If you bought some FR4 boards that had ground plane on one side, and only dielectric on the other, fed them in one sheet at a time, I wonder if you could print actual solderable top surface metal?
You would still need to worry about via holes, but it would be pretty good for prototype boards or antennas, anything where the chip components were not too small.
yes you are right in saying if you have machines for both cases. Why are you not putting the cost of printer in case of inkjet printing?A board costs at least $60, and it will take at least 2 days to get from a shop!
A router like LPKF is on the order of $15K to get going. And you have to buy router bits at some expense, as they wear down/break.
Just how expensive would the ink be for a 4 x 6" board with some microwave circuits on it (i.e. not many traces)? Even if it was $100 in ink, that would be acceptable.
Hi
Actually when you say "photopaper" you should not think about ordinary paper for newspapres or books. It's strongly laminated and it has plastics inside. From this view point it's acceptable for your goals because it absorbs less moisture. I guess the dielectric cosntant is between 2.5 and 3.5................
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