Dielectric Constant? of polymers at High Freq, 1

[ncc1701]

Does anybody know where I might find either charts or data on commonly used polymers in the electronics industry? For example most data sheets only show information to 10 GHz or so. I am looking for data on Ultem, Kel-F, and the like at frequencies 30 GHz to 65 GHz. Can someone please help me!

 

[logbook]

As a new service for IEE members, we are now able to search electronic versions of quite a few recent text books. I searched on "Ultem" and found 49 books referencing it. Only one had dielectric properties against frequency and it only went to 6GHz.

I think the 30GHz to 65GHz region you are interested in is too new to be well documented. I also think that standard equipment will not be available at manufacturers to measure the properties. I am sure the manufacturers would measure it for you if it were easy.

I would phone the manufacturers/distributers and talk with them about the problem.

I doubt that many laboratories exist that can do such work at 65GHz.

 

[Higgler]

Very few measurements are published on dielectrics at those higher frequencies. Not even Rogers corporation will give you data measured on their materials at frequencies above 18 ghz.

You'll probably have to measure them on your own with one of the various resonator techniques (cube, printed circuit, flat sheet). Rogers uses the flat sheet resonance technique.

For information on a large quantity of materials at lower frequencies, I purchased "Dielectric Materials and Applications" by Arthur Von Hippel, from Artech house. It's very old, 1954 vintage but last release date was 1995.
They tested alot of materials up to 10 ghz, and a few to 25 ghz.

kch
(antennas)

 

[ncc1701]

So can anybody email or otherwise direct me to a source graph for this material and possibly others? A graph because it can be extrapolated what it might be at a data point beyond the graph limits.

 

[Higgler]

http://www.matweb.com/index.asp?ckck=1

has data on alot of materials, I looked for Ultem, they have about 100 variants of Ultem but nothing on Kel-f. Some of the Ultems have data on dielectric constant, but usually it's only one or two frequencies.

Try the other forums to see if anyone has used this material. Antennas and Propagation and the Microwave forums are more likely to have someone who designs higher frequency components.

kch