The most common frequency for characterization testing is 5.1GHz. This is due to the impact material would have and the fact that material parameters tend to remain relatively stable at lower frequencies. If you need a specific frequency, let us know and we will find the best way to get it tested.
In order for us to do the testing, we need a sample of the material. The sample size has to be at least 30mm in diameter or 30x30mm while the maximum thickness is less than 1.95mm but it depends on the material. We will help you to define the correct thickness for the sample.