A compact size reconfigurable 1-3 GHz impedance tuner suitable for RF MEMS applications

This paper proposes a novel spiral topology for a reconfigurable stub tuner with radio-frequency micro electro mechanical system (RF MEMS) switches. The flexibility of the configuration permits the transformation from single to double and triple stub tuning covering a wide range of impedance values. Moreover, the number of switches present in the tuner dictates the range of loads to be matched. The design produces 2048 different impedances. The design of a spirally rolled parallel coplanar waveguide (CPW) transmission line tuner is presented along with simulation results. The proposed tuner provides real-time reconfiguration and matching for RF loads that could change during system operation. Real time intelligent algorithm would be used to control electronically the tuner. This proposed design would be used for military and high performance circuit applications for future low-cost and low-power intelligent RF micro systems and systems-on-chip.