Design of Unequal Dual-Band Gysel Power Divider With Arbitrary Termination Resistance

This paper presents an exact closed-form design method for dual-band unequal Gysel power divider with arbitrary termination resistance. To obtain the unequal property, branch lines with different characteristic impedances attached to a short-circuit terminated stub and an open-circuit terminated stub are needed. Arbitrary termination resistance matching can be achieved without additional output transformers. Line impedance analysis shows the proposed structure can support large power-dividing ratio (up to 6) with wide frequency ratio range (1.5-2.4). Power operation analysis shows that it maintains Gysel divider's high power-handling advantage over Wilkinson divider.