**Abstract**

With the remarkable progress in the use of Internet of Things (IoT) and 5G, there is a demand for higher performance such as miniaturization, broadband/multiband, low loss, and high integration for several microwave circuits. This chapter treats microwave power dividers/combiners used in amplifiers, mixers, phase shifters, antenna feeding networks, and so on. Here, the treated circuits are composed of LCladder circuits and an absorption resistor. It shows that multiband (dual-band and triband) and broadband can be achieved by changing the number of stages of the LCladder circuit. In addition, the effectiveness of this design method is demonstrated by electromagnetic simulations and prototype experiments.

**Keywords:** Wilkinson power divider, lumped-element, LC-ladder circuit, compact, broadband/multiband
