6bbf497ca68443ba36d4374bb9beda46dee10eb310fe003cc4e612d096cd389e  Microstrip_Configurations_of_Reflective-Mode_Phase-Variation_Permittivity_Sensors_Based_on_Weakly_Coupled_Step_Impedance_Resonators_SIR_An_Analysis_to_the_Light_of_Circuit_Duality.pdf