Need help on T-Resonator

Hi All,

I have a coplanar T-Resonator. It's an open quarter wavelength resonator. I'm using the resonator for substrate characterization. I did 2-port measurement by taking the T arms as port 1 and port 2.
My questions are:
1. How can I extract the quality factor due to the conductor losses and the radiation losses.
2. Do I need to take the T arms into account at resonant frequencies?
3. The characteristic impedane(Zo) is needed to find conductor losses. Is it the Zo of the whole resonator (defined from 2-port measurement) or simply the Zo of the resonating coplanar line (the open stub) ?

thanks in advance