Novel Gysel power dividers with tunable power dividing ratio and central frequency

Abstract

Novel power dividers based on Gysel architecture with tunable power dividing ratio (TPDR), tunable central frequency (TCF), perfect port matching and isolation are proposed. The regulatory mechanism of traditional Gysel Power Divider (GPD) is studied, and a novel electrical tunable method is presented to tune the power divider ratio by only the electrical length of the GPD section, which simplifies the design of tunable power dividers. Tunable T-type networks are used to tune the power dividing ratio and central frequency by tuning this electrical length parameter, and the TPDR range can be pre-defined by setting the characteristic impedance of the transmission lines in the tunable power divider. The tunable mechanism of the circuits was theoretical studied. Two power dividers operating at 950 MHz with TPDR of 0.3:1 ∼ 35.9:1 and 1.1:1 ∼ 35.4:1, and a GPD with TCF in 1.1 GHz ∼ 1.6 GHz were designed and fabricated. All the measured results are in good agreement with the simulation.