Loss tangent of cardboard
I would like to know the loss tangent of cardboard at <25MHz. I tried searching for values, but without any luck. Any help would be appreciated. Thanks.
Hi, not sure, but I think this is related to dielectric constant (relative permittivity) of the material? These things are hard to find.. I know the dielectric constant for a few materials (some plastics) but not for cardboard...
If "cardboard" is meant to refer to a technical printed circuit board substrate, it would be a good idea to use a sligthly more precise specification. Generic FR4 has a loss tangent specification of 0.035 @ 1 MHz.
I meant a packaging cardboard. I am using it as a base to make flat spiral coils and want to test them. But I cannot find the loss tangent data for the frequency I want to test. The cardboard material has negligible loss tangent at 915 MHz. But does this imply anything at all at frequencies <25 MHz?
It will be surely low for dry material and most likely affected by moisture, which is absorbed by paper and similar materials. This means that you can hardly specify an exact value.
It's easy to measure a test capacitor with a LCR meter or VNA.
looks like it is 0.061
http://www.google.com/url?sa=t&rct=j...xq34nWcNbpgC4A