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Central Gap Ring Resonator (CGRR) sensor: (a) Layout of the CGRR sensor including the CGRR, variable inductive coupling feedlines, outer aluminium, polystyrene platform, and PTFE sample tube. (b) Measured and simulated transmission response with an empty PTFE tube [77]. Reprinted from Hamzah, H. High Q Microwave Microfluidic Sensor Using a Central Gap Ring Resonator. IEEE Transactions on Microwave Theory and Techniques, 2020, with permission from IEEE.
