884ede8a836f580d80ed0d933d8da1d38a8b7db32fb86996534cd811cf2f6ed7  A_Versatile_Reflective-Mode_Phase-Variation_Microwave_Sensor_Based_on_a_Dumbbell_Defect-Ground-Structure_DB-DGS_Resonator_for_Solid_and_Liquid_Characterization.pdf