Triangular Split Ring Resonator(TSRR)

I am doing UG Final Year Project in Antenna.Our antenna is metamaterial Triangular Split Ring Resonator(TSRR) and I am in need of length and width equations for TSRR.I searched a lot but I can't find the equation.Can anyone tell me if there is any equation or any other alternative way(circuit model to layout model) to find the equation?

You can consult Advanced Engineering Electromagnetics by CA balanis in metamaterials. Most of the work is being done in circular configuration of SRs as circular configuration provides least of the discontinuities. However you can modify the design equations provide by JB Pendry and O Sydrouk in their research papers for triangular version. i would recommend you to design it on circular configuration first and then modify it. Thanks.