Electron paramagnetic resonance (EPR) is a technique used to study and manipulate electron spins in various functional materials. Recently, major advances in EPR sensitivity were achieved using planar superconducting microresonators [1,2]. However, microresonators fabricated from conventional superconductors have severe limitations for conventional EPR due to their low temperature of operation and susceptibility to the magnetic field. For this reason, microresonators fabricated from high-Tc superconductors are gaining attention [3].
Here, we explore a novel planar “airplane” microresonator geometry coupled to a co-planar waveguide (Fig. 1) using the CST Microwave Studio computational electromagnetics tool. We analyze the distribution and homogeneity of the microwave magnetic field produced by the microresonator. Our results show that the highest magnetic field density is concentrated on the inductor region, although the undesirable contribution from the capacitor is also significant. We discuss ways to further improve the resonator design.
