A Planar Out-of-Phase Gysel Power Divider with High Power Division

A novel planar Gysel power divider with high power dividing ratio and out-of-phase characteristics is presented in this paper. In order to realize higher power dividing ratio and out-of-phase feature between two output ports, a section of coupled lines with one short-circuited end is used in the proposed power divider. By using the transmission line theory, the circuit is analyzed and the design equations are given to determine the corresponding circuit parameters of the proposed Gysel power divider. For verification, a prototype operating at 2 GHz with power dividing ratio of 6 is designed, fabricated and measured. The measured results show about 18% relative bandwidth is obtained in terms of returning loss greater than 20dB and the isolation is better than -25dB over the range of 1.6 to 2.4GHz. The measured phase difference between two output ports is about 180
⁰
±6
⁰
from 1.6 to 2.2GHz. The measured results are in good agreement with the simulated ones.