A dual-frequency Wilkinson power divider: for a frequency and its first harmonic

A Wilkinson power divider operating not only at one frequency f₀, but also at its first harmonic 2f₀ 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 f₀ and 2f₀, simultaneously.