A dual-frequency Wilkinson powder divider: For a frequency and its first harmonic

A Wilkinson power divider,operating not only at one frequency f(0), but also at its first harmonic 2f(0) is presented. This power divider consists of two branches of impedance transformer, each of which consists of two sections of 1/6-wave transmission-line with different characteristic impedance. The two outputs are connected through a resistor, an inductor, and a capacitor. All the features of a conventional Wilkinson power divider, such as an equal power split, impedance matching at all ports, and a good isolation between the two output-ports, can be fulfilled at f(0) and 2f(0) simultaneously.