Electric permittivity measurement

Hi everybody,

I would like to measure electric permittivity of a FR4 similar material.
Having no time and equipement for transmission/reflection line technique, open ended coaxial probe technique and other more or less time consuming methods I thought of doing I little bit of reverse engineering.

I thought of constructing a simple, square, microstrip fed patch antenna. Measure exactly its dimensions and resonating frequency and from there calculating electric permittivity.

What do you think? Is this method plausible? Will I get precise results?

Thank you

This method can be to some extent true, but be careful. I think the accuracy isn't very much and also it depends on the measurement accuracy of antenna pattern.