Synthesis of a Tunable Impedance Inverter Based on Variable Position of Capacitive-Loads

This work presents a topology to meet the demand of tunable quarter-wavelength impedance inverters. The proposed solution lies in a transmission line loaded by capacitors whose positions are variable. The associated synthesis is proposed and leads to the possibility of producing a quarter-wave inverter operating at two different frequencies and with two characteristic impedances that can be optimized thanks to the degree of freedom provided by the position of the capacitors.